Service Section Service Section Technical Training Technical - - PowerPoint PPT Presentation

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Service Section Service Section Technical Training Technical Training Dec 2004 Dec 2004

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Contents

• 1. Introduction
• 2. Inverter Technology
• 3. Features
• 4. Self Diagnosis
• 5. Troubleshooting

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

INTRODUCTION

• Electrical supply has fix frequency
• Inverter type air conditioner have frequency changer

which can change the electrical frequency to control the speed of the compressor.

• This in turn, can control the capacity accordingly.

What is Inverter Air Conditioners?

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Difference between Inverter System and Conventional System

Time Compressor capacity

Full capacity

Conventional compressor

• Conventional air conditioners control temperature by switching

the compressor on and off.

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Difference between Inverter System and Conventional System

Slow down as temperature drops High rotation speed to pull down temperature

Compressor capacity

Time Time Maintain room temperature at low speed Inverter

• Inverter air conditioners control the rotation speed of

compressor smoothly to maintain room temperature.

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Set Temp. Time Conventional AC Inverter air conditioner Room Temp.

Room temp >> Set temp

• high speed to reach set temp.

Set temp ~ Room temp

• low speed

Difference between Inverter System and Conventional System

• Fluctuating of temp.
• Not comfortable

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Running current Hours of operation Conventional air conditioner:

• High starting current
• Frequent on/off cycle

Inverter air conditioner:

• Low starting current
• Smooth operation

Low Starting Current

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Comparison between DC Inverter and AC Inverter

Efficiency (%) Efficiency (%) Motor Output Motor Output [ kW] [ kW] 0.5 0.5 1.0 1.0 50 50 60 60 70 70 80 80 90 90

DC Inverter AC Inverter

AC Induction Motor Compressor

• Lower Efficiency

DC Brushless Motor Compressor

• Higher Efficiency

AC Inverter AC Inverter DC Inverter DC Inverter

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Stable room temperature
• Fast cooling
• Less on/off cycle of compressor
• Low starting amp – soft start
• Protection against over-current and over-temperature
• Energy saving

Advantage of Inverter Air Conditioning

INTRODUCTION

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Changing Frequency

U (V) U (V) t(s)

f = 50 Hz

t(s)

f = 70 Hz

We can change Compressor Speed by changing the Frequency

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter System Block Diagram

Energy Source Rectifying Circuit Inverter Circuit Motor Control & Protection Circuitry Feedback

Only for DC Inverter Model

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Result: AC → DC

V t(s) V t(s)

Rectifier Circuit

V

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

V t(s)

By using a Capacitor Smoothing the DC Voltage

V

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

t(s) t(s) V V

f (Hz)

Inverter Circuit

S1 S2 R

INVERTER TECHNOLOGY

S1 S2 R (1) (2)

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Pulse Width Modulation P.W.M. = Improving the Current

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

AC 50 Hz DC 50 Hz Smooth DC

• Var. Hz

P.W.M. Var. Hz Overview of the different phases

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Air-Conditioning

M IN OUT

Diode Reactor Electrolytic capacitor IPM(Inverter Module)

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Air-Conditioning

M IN OUT AC-DC Rectifier with Smoothing Inverter with P.W.M.

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Rectifier Inverter (PWM) Summary Compressor

IN OUT Vin: 240V f : 50Hz Vout : variable f : variable

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Existing OYL Inverter Models Existing OYL Inverter Models

• DC

DC Inveter Inveter (5SLX10/15CR) (5SLX10/15CR) – – Single Split Single Split

• AC Inverter (MSV25/35A)

AC Inverter (MSV25/35A) – – Multi Split Multi Split

INVERTER TECHNOLOGY

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Indoor Fan Motor (SCR Motor) Indoor Fan Motor (SCR Motor)

• Speed is controlled by micro-processor by means of phase

angle control

• Additional 3 wires connected to PCB for speed feedback

(Error if no feedback)

• No fan relay (no clicking noise when changing speed)
• Recommend to use Auto Fan Mode for small room (fast

cooling and low noise)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Provide precise capacity control
• Control through Fuzzy Logic Method

Expansion Valve Body Solenoid Coil

Electronic Expansion Valve (EXV) Electronic Expansion Valve (EXV)

For MSV25/35A (Multi Split) For MSV25/35A (Multi Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Make use of thermister as sensors to determine suitable super

heat value for best capacity control

Electronic Expansion Valve (EXV) Electronic Expansion Valve (EXV)

For MSV25/35A (Multi Split) For MSV25/35A (Multi Split)

h h Superheat 5 Superheat 5° °C Ideal C Ideal p p

Suction sensor Suction sensor ID coil sensor ID coil sensor

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• The system has 5 operating modes. The mode selection is done in

Inverter (indoor) controls.

• The operating modes are:

– Cool – Dry – Heat – Auto – Fan

Function - Operating Modes

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function – Cold Start

Compressor capacity Time

20 min Max Rated

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

60 60 42 42 Cooling Rated Frequency (Hz) Cooling Rated Frequency (Hz) 70 70 58 58 Heating Rated Frequency (Hz) Heating Rated Frequency (Hz) 100 100 85 85 Heating Max Frequency (Hz) Heating Max Frequency (Hz) 20 20 15 15 Cooling / Heating Min Frequency (Hz) Cooling / Heating Min Frequency (Hz) 85 85 60 60 Cooling Max Frequency (Hz) Cooling Max Frequency (Hz)

5SLX15CR 5SLX15CR 5SLX10CR 5SLX10CR

Compressor Running Frequency (Single Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Compressor Running Frequency (Multi Split)

20 20 20 20 Cooling Min Frequency (Hz) Cooling Min Frequency (Hz) 100 100 90 90 Cooling Max Frequency (Hz) Cooling Max Frequency (Hz)

MSV35A MSV35A MSV25A MSV25A

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Starting Control

85Hz 40Hz 1 min 1 min

• A minimum torque is provided during start up.
• When target frequency > 40Hz,

– 40Hz for one min.

• When target frequency > 85Hz,

– 40Hz for one min and at

85Hz for 1 min

(1st Platform Freq) (2nd Platform Freq)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Starting Control

40Hz 1 min

• When target frequency is < 40Hz,

– 40Hz for one min

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Cool Mode

• When Tr >= Ts + 1°C
• Comp, ID Fan and OD Fan ON
• When Tr <= Ts - 1°C
• Comp and OD Fan OFF
• ID Fan remain ON

Tr = Room Temperature Ts = Set Temperature

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• At beginning of cooling operation, compressor operate at

higher frequency to reduce the room temperature.

• When set temperature is achieved, operation frequency will

be reduced to stabilize the room temperature.

Function - Cool Mode

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control When will Compressor Stop?

• When cooling load is too small, even with lowest operation

frequency, room temperature still fall below compressor cut off point, compressor will stop.

Compressor capacity

Time Time

Tr Tr <= Ts <= Ts -

• 1°C

1°C Comp will stop Comp will stop

Lowest Freq

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• When Tr > Ts + 2°C (Unit operates in Cooling mode)
• When Tr <= Ts + 2°C (Unit enters Dry operation)
• Compressor will run at 30Hz and 60Hz alternately.
• ID Fan run at low speed.

Function - Dry Mode

• When Tr < Ts - 2°C
• Comp & OD Fan Off
• ID Fan On

60 Hz 30 Hz 60 Hz

6 min 10 min

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Heating Mode

• Ts = Ts_user + 3°C
• When Ts >= Tr + 1°C
• Comp, 4WV and OD Fan ON
• When Ts <= Tr – 1°C
• Comp, 4WV and OD Fan OFF
• Indoor Fan run at low speed for 40 sec and OFF

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• At beginning of heating operation, compressor operate at

higher frequency to increase the room temperature.

• When set temperature is achieved, operation frequency will

be reduced to stabilize the room temperature.

Function - Heating Mode

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control When will Compressor Stop?

• When heating load is too small, even with lowest operation

frequency, room temperature still rises above compressor cut off point, compressor will stop.

Compressor capacity

Time Time

Ts+1°C <= Ts+1°C <= Tr Tr Comp will stop Comp will stop

Lowest Freq

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Heating Mode

Cold Air Prevention Control

• Ti_coil < 23°C (ID Fan Stop)
• Ti_coil >= 28°C (ID Fan Run at Low Speed)
• Ti_coil >= 38°C (ID Fan Run at User Set Speed)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Room temperature >= 23°C

– Cool mode – Features of cool mode

• Room temperature < 23°C

– Heat mode – Features of heat mode

Function - Auto Mode

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Auto Fan (Cool Mode)

3 3 2 2 1 1

Tr Tr -

• Ts (°C)

Ts (°C)

L L M M L L M M H H

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Auto Fan (Heat Mode)

3 3 2 2 1 1

Ts Ts -

• Tr

Tr (°C) (°C)

L L M M L L M M H H

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

29˚C 20˚C 26˚C 16˚C Fan Speed L H L

Tambient

Cooling Operation Cooling Operation

• When outdoor temperature is low, outdoor fan motor will run at

When outdoor temperature is low, outdoor fan motor will run at low speed to reduce noise level low speed to reduce noise level. .

Function – Outdoor Fan Speed Control (Single Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function – Outdoor Fan Speed Control (Single Split)

Cooling Operation Cooling Operation

• When Fan Speed is running at

When Fan Speed is running at Low fan Low fan, O/D coil sensor will , O/D coil sensor will determine whether the fan speed need to be increased back or determine whether the fan speed need to be increased back or not (to ensure Capacity). not (to ensure Capacity).

37˚C 30˚C 35˚C 28˚C Fan Speed L H L

To_coil

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

15˚C 9˚C 17˚C 11˚C L H L

Tambient

Fan Speed

Heating Operation Heating Operation

• When outdoor temperature is low, outdoor fan motor will run at

When outdoor temperature is low, outdoor fan motor will run at high speed high speed

Function – Outdoor Fan Speed Control (Single Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

29˚C 20˚C 26˚C 16˚C Fan Speed L M H M L

Tambient

Cooling Operation Cooling Operation

• When outdoor temperature is low, outdoor fan motor will run at

When outdoor temperature is low, outdoor fan motor will run at low speed to reduce noise level low speed to reduce noise level. .

Function – Outdoor Fan Speed Control (Multi Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function – Outdoor Fan Speed Control (Multi Split)

Cooling Operation Cooling Operation

• When Fan Speed is running at

When Fan Speed is running at Medium or Low fan Medium or Low fan, O/D coil , O/D coil sensor will determine whether the fan speed need to be sensor will determine whether the fan speed need to be increased back or not (to ensure Capacity). increased back or not (to ensure Capacity).

37˚C 30˚C 35˚C 28˚C Fan Speed L M H M L

To_coil

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

15˚C 9˚C 17˚C 11˚C L M H M L

Tambient

Fan Speed

Heating Operation Heating Operation

• When outdoor temperature is low, outdoor fan motor will run at

When outdoor temperature is low, outdoor fan motor will run at high speed high speed

Function – Outdoor Fan Speed Control (Multi Split)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Turbo function is not available in Auto and Fan mode.
• If higher cooling or heating is required during operation,

press “Turbo” button on the remote control to increase the cooling or heating capacity to maximum.

• When activated, the set temperature will be:

– Reduced by 3°C for Cool mode – Reduced by 3°C for Dry mode – Increased by 3°C for Heat mode

Function - Turbo Function

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Defrost Operation

• Only available in Heat mode.
• Activated when controller detect difference between outdoor coil temp

(To_coil) and outdoor air temp (Ta)

• Condition for entering defrost operation

a) Comp run time > 20 min, Ta > 5°C & To_coil <= -3°C for 5 min OR b) Comp run time > 20 min, Ta - To_coil >= 7°C for 5 min OR C) Ta <= -15°C & compressor run time >= 3 hours

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Defrost Operation

During Defrost Operation

• 1. Comp reduces speed to 30Hz
• 2. 4WV off
• 3. Outdoor Fan stop
• 4. Comp will increase speed to 90Hz
• 5. Indoor Fan off under “Cold Prevention Function”

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Function - Defrost Operation

Defrost Termination

• Timer Control
• Defrost operation = 8 min
• Temperature Control
• To_coil >= 14°C

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

OD fan OD fan ON ON OFF OFF COMP COMP Defrost Cycle Defrost Cycle ID fan ID fan 4WV 4WV 28s 28s 2s 2s 6min 6min 2min 2min 50s 50s 10s 10s ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF Heating Mode Heating Mode Heating Mode Heating Mode Defrost Defrost Terminate Terminate

Function - Defrost Operation

30 Hz 90 Hz

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control – Compressor

• 3 minutes Minimum OFF time

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• During low frequency operation, oil might be trap in the
• system. The controller will ensure that the oil is properly

return.

• If the compressor has been continuously operating below

50Hz for 1 hour, the compressor will operate at 60Hz for 2 minutes to assist oil return.

Protection Control - Oil Return

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Current Control

Multi Split Current Detector

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Current Control (Single Split)

I2 I1 Compressor stops Compressor stops Frequency step down Frequency step down Normal Operation Normal Operation Total Current

Cooling Heat Pump Cooling Heat Pump I1 8.5 A 9.5 A 9.5 A 10.0 A I2 12.5 A 13.5 A 13.5 A 14.0 A 1 HP 1.5 HP Total Current

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Current Control (Multi Split)

Current Limit Selection Current Limit Selection

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Current Control (Multi Split)

Current Limit Selection Current Limit Selection

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Current Control (Multi Split)

I2 I1 Compressor stops Compressor stops Frequency step down Frequency step down Normal Operation Normal Operation Total Current

For 2 x WMX10G @ OD 30°C< air temp < 40°C (With Current Limit = For 2 x WMX10G @ OD 30°C< air temp < 40°C (With Current Limit = 17A) 17A)

14.3 A 14.3 A 13 A 13 A Total Current Total Current = 13A * 110% = 13A * 110% I2 I2 Rated Running Current Rated Running Current I1 I1

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Compressor Discharge Temperature Control

Compressor stops Compressor stops Frequency step down Frequency step down Maintain frequency No limit No limit Compressor Compressor Discharge Discharge Temperature Temperature 115°C 100°C 85°C

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Low refrigerant is checked by compressor discharge
• temperature. When there is a leak, compressor will operate

at high discharge temperature.

Protection Control - Low Refrigerant (Gas Leak)

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• The outdoor coil overload control is performed in Cool

and Dry mode.

Protection Control - Outdoor Coil Overload Control

Compressor stops Compressor stops Frequency step down Maintain frequency No limit Outdoor Coil Temperature > 70°C for 30 sec continuously 70°C 60°C 50°C

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• The indoor coil overload control is performed in Heat mode.

Protection Control - Indoor Coil Overload Control

Compressor stops Compressor stops Frequency step down Maintain frequency No limit Indoor Coil Temperature > 70°C for 30 sec continuously 70°C 52°C 46°C

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Indoor Coil Anti-freeze

• The indoor coil Anti-freeze is performed in Cool Mode.

Compressor stops Compressor stops Frequency step down Maintain frequency No limit Indoor Coil Temperature < -1°C for 5 min continuously 10°C 7°C

• 1°C

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

• Indoor controller board will transmit signal to Outdoor

controller board every 2 second.

• If the data communication line between indoor and outdoor
• ccurs error for 30 seconds continuously, compressor will

stop.

Protection Control - Data Communication Error Between Indoor and Outdoor (Single Split)

Indoor A Outdoor Send Signal Send Signal Acknowledge Acknowledge

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Data Communication Error Between Indoor and Outdoor (Multi Split)

Indoor A Outdoor Send Signal Send Signal Acknowledge Acknowledge

Normal Operation Normal Operation

Indoor B

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Data Communication Error Between Indoor and Outdoor (Multi Split)

Outdoor Send Signal Send Signal Acknowledge Acknowledge

Normal Operation Normal Operation

Indoor A Indoor B

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Data Communication Error Between Indoor and Outdoor (Multi Split)

Outdoor

Communication Error Communication Error

No Signal No Signal From From Indoor B Indoor B For 10 sec For 10 sec Indoor A Indoor B

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Data Communication Error Between Indoor and Outdoor (Multi Split)

Outdoor

Communication Error Communication Error

Will Switch to Will Switch to Indoor A and Indoor A and Communicate Communicate Indoor A Indoor B

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Protection Control - Data Communication Error Between Indoor and Outdoor (Multi Split)

Outdoor

Communication Error Communication Error

Indoor B is Indoor B is confirmed in ERROR confirmed in ERROR if no Signal from it if no Signal from it for for 2 min

2 min

continuously continuously Indoor A Indoor B

FEATURES

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

SELF DIAGNOSIS

• When fault is detected during operation, it can

be indicated by LED light (indoor & outdoor)

• Simplify and ease the troubleshooting process

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Inverter Cooling Unit - Indoor Unit LED Indication (WMX-F series)

SELF DIAGNOSIS

Operation / Fault Condition

Timer Sleep Power Dry

Timer ON Cool mode Sleep mode ON Dry mode Indoor temperature sensors contact loose / short Outdoor temperature sensors contact loose/short Gas leak / compressor overload Communication error between indoor and outdoor IPM / PFC error Outdoor total current trip / DC peak Indoor fan feedback error

ON

ON or OFF Blinking

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Inverter Heatpump Unit - Indoor Unit LED Indication (WMX-F series)

SELF DIAGNOSIS

Operation / Fault Condition

COOL DRY HEAT STANDBY TIMER

Cooling mode Dry mode Stand-by / Fan mode Heat mode Auto mode Defrost operation Compressor overload protection (Current Overload) Indoor temperature sensors contact loose / short Outdoor temperature senors contact loose / short Gas leak / compressor overheat Communication error between indoor and outdoor Inverter error Outdoor total current trip /DC peak Indoor fan feedback error

ON

ON or OFF Blinking

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Inverter Cooling Unit - Indoor Unit LED Indication (WMX-G series)

Self Diagnosis Table -- Indoor LED Display

Operation / Fault Condition

Sleep Mode Cool Timer Ionizer

Cool mode Sleep mode ON Timer ON Ionizer ON

RED

Defrost Operation

Yellow

Indoor temperature sensors contact loose / short Coil temperature sensor contact loose / short Outdoor temperature sensors contact loose/short Gas leak / compressor overload Communication error between indoor and outdoor IPM / PFC error Outdoor total current trip / DC peak Communication error between indoor and outdoor Indoor fan feedback error

ON

ON or OFF Blinking

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

LED Location (Single Split) IPM PCB IPM PCB

Inverter Module LED (Blinking in RED)

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

LED Location (Multi Split) Power PCB Power PCB

Power PCB LED

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Common for Single Split & Multi Split Common for Single Split & Multi Split

Inverter Module - Normal Running Mode LED Indication

SELF DIAGNOSIS

Outdoor Frequency Adjustment 8# Indoor Fan Speed Limit 7# Indoor Coil Temperature Limit 6# Discharge Temperature Limit 5# Total Current Limit 4# Outdoor Coil Temperature Limit 3# Under/Over Voltage Limit 2# Normal 1# Indication Blink

1s 1s 1s

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Module – Compressor Stopped LED Indication

For Single Split For Single Split

SELF DIAGNOSIS

Check Interconnection communication wire Communication Error 5# Call local dealer DC Compressor Feedback 4# Check discharge sensor wire and connection / Not enough refrigerant / Indoor overload Discharge Sensor Problem 3# Check coil sensor wire and connection Coil Sensor Problem 2# Check ambient sensor wire and connection Outdoor Sensor Problem 1# Corrective Action Errors Blink

0.5s 0.5s 0.5s

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Module – Compressor Stopped LED Indication

SELF DIAGNOSIS

Check whether outdoor unit is blocked

• r not

Cooling Overload 10# Compressor fail to start DC Compressor Start Failure 9# Check power supply Under/Over Voltage 8# Check compressor wire and connection No Load 7# Call local dealer Over Current 6# Corrective Action Errors Blink

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Module – Compressor Stopped LED Indication

SELF DIAGNOSIS

Change EEPROM EEPROM Writing Error 14# Change EEPROM EEPROM Reading Error 13# Check DC supply on IPM board IPM Protection 12# Wait till defrost is over then it will restart automatically Defrost 11# Corrective Action Errors Blink

• - - NA - - -

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Module – Compressor Stopped LED Indication

For Multi Split For Multi Split

SELF DIAGNOSIS

Check Interconnection communication wire Communication Error 5# DC Compressor Feedback 4# Check discharge sensor wire and connection / Not enough refrigerant / Indoor overload Discharge Sensor Problem 3# Check coil sensor wire and connection Coil Sensor Problem 2# Check ambient sensor wire and connection Outdoor Sensor Problem 1# Corrective Action Errors Blink

• - - NA - - -

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Inverter Module – Compressor Stopped LED Indication

SELF DIAGNOSIS

Check whether outdoor unit is blocked

• r not

Cooling Overload 10# DC Compressor Start Failure 9# Check power supply Under/Over Voltage 8# Check compressor wire and connection No Load 7# Call local dealer Over Current 6# Corrective Action Errors Blink

• - - NA - - -

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

SELF DIAGNOSIS

DC Fan Motor Feedback Error 15# Change EEPROM EEPROM Writing Error 14# Change EEPROM EEPROM Reading Error 13# Check DC supply on IPM board IPM Protection 12# Wait till defrost is over then it will restart automatically Defrost 11# Corrective Action Errors Blink

• - - NA - - -
• - - NA - - -

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control DC Compressor Speed Control Error 19# Check A suction sensor wire and connection Outdoor Suction A Sensor Error 21# Check B suction sensor wire and connection Outdoor Suction A Sensor Error 22# Check suction sensor wire and connection Outdoor Suction Sensor Error 17# Call local dealer AC Peak Current Error 16# Corrective Action Errors Blink

• - - NA - - -

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Check Interconnection communication wire to Indoor B Indoor B Communication Error 32# Check Interconnection communication wire to Indoor C Indoor C Communication Error 33# Check Interconnection communication wire to Indoor D Indoor D Communication Error 34# Check Interconnection communication wire to Indoor A Indoor A Communication Error 31# Check D suction sensor wire and connection Outdoor Suction D Sensor Error 24# Check C suction sensor wire and connection Outdoor Suction C Sensor Error 23# Corrective Action Errors Blink

SELF DIAGNOSIS

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Troubleshooting

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Power ON (Set temp to the lowest for cooling; Set temp to the highest for heating)

• Check indoor fan motor
• Check indoor PCB

Check terminal block “1” and “2”. No No Yes Yes No No Yes Yes

• Check remote control

handset

• Check if there is any direct

sunlight, flashing lamp shine onto the receiver.

• Check indoor PCB

Is indoor fan running normally? No No Yes Yes Check:

• indoor sensor
• wiring between indoor main

board and switch board

• indoor PCB

Check outdoor unit

Indoor Unit

Is there any power supply to

• utdoor

unit? Any “beep” sound when remote control is pressed?

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

L 3 1 N E 2 E INDOOR PCB

SIG

Relay

TROUBLESHOOTING

1 2 3 L N

To Outdoor

1 2 3 L N

From Outdoor Single Split Multi Split

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

Main Board

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

1) Make sure 1) Make sure power supply power supply is sufficient. is sufficient. 2) Fuse Blown? 2) Fuse Blown? Change Fuse Change Fuse

Main Board

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

3) Diode Checking 3) Diode Checking

• Turn Off power & remove cables

Turn Off power & remove cables

• Use a multi

Use a multi-

• meter and select “diode” measurement

meter and select “diode” measurement

• Measure each of the diode, value should be 0.4 ~ 0.6 V

Measure each of the diode, value should be 0.4 ~ 0.6 V

• If value is 0, change the diode bridge

If value is 0, change the diode bridge

+ ~ ~

• Main Board

+ve pin

• ve pin

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

4) While maintaining power supply, 4) While maintaining power supply, use multi use multi-

• meter to check DC Voltage on the electrolytic capacitor OR

meter to check DC Voltage on the electrolytic capacitor OR the IPM board. The reading should be around 300 the IPM board. The reading should be around 300 Vdc Vdc. . (With 300Vdc, If LED is blinking for IPM error, then replace (With 300Vdc, If LED is blinking for IPM error, then replace IPM) IPM)

Main Board

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

• Check from Power Supply till Compressor

Electrolytic Capacitor (Multi Split Model)

+ve

• ve

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

• Check from Power Supply till Compressor

Electrolytic Capacitor (Single Split Model)

+ve

• ve

+ve

• ve

IPM Board More Convenience!!

+

• U

V W

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

5) Check the connection wire for compressor. 5) Check the connection wire for compressor. Make sure the U,V,W are connected correctly. Make sure the U,V,W are connected correctly.

Main Board

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control Outdoor Unit (Single Split & Multi Split)

+ P N

• Check from Power Supply till Compressor

6) If everything is all right and the unit won 6) If everything is all right and the unit won’ ’t run, change t run, change main board / entire control box. main board / entire control box.

Main Board

TROUBLESHOOTING

Technical Training Technical Training Technical Training Inverter Control Inverter Control Inverter Control

Thank You