40
4TWL9048A-SF-1C-EN
Inverter Temperature
No
Check Torque of screws
(55-65 in. lbs.). Tighten
mounting screws
and/or re-do thermal
paste
No
Verify Module Temperature Sensors:
1) Shutdown unit and wait at least 30 minutes
2) Inverter and rectifier temperature sensors should both be close
to the ambient temperature. Use CDA Monitor Menu.
Yes
Yes
No
Verify operating range is within
limits. See product specifications
for more infomation.
Proceed to Startup and
check inverter and
rectifier temperatures
(normal range is less
than 200F)
Visual/Mechanical
Inspection of Heat Sink
OK?
Are all fasteners present
Alignment of bracket
Cracks in bracket
Corrosion/pitting
Do
Inverter/Rectifier
temps look
in range?
Sensor Fault
Drive Failure
Cooling Issue: Drive
Failure or still ambient
condition issue
Excessive Rectifier
Temperature De-rate
Excessive Rectifier
Temperature
Shutdown
Excessive Inverter
Temperature De-rate
Excessive Inverter
Temperature
Shutdown
Check system condition: outdoor
temp sensor, suction temp, suction
pressure inverter temp, rectifier
temp, dome temp and drive current
for each leg, supply voltage
Is
System in
normal operating
state?
Check for System
Issue
Lack of Heat Dissipation
Due to:
OD fan failure in cooling
ID fan failure in heating
Ref. blockage
Charge
Non-condensib les
Disassemble Tube
from cold plate
Ye s
+VDC -VDC
ELECTRICAL
HAZARD
Failure to follow this
warning could result in
personal injury or death.
WAIT TWO (2) MINUTES
after disconnecting power prior
to touching electrical
components as they may hold
a dangerous charge
of 400VDC, then verify DC
Voltage is less than 42 VDC
at inverter test points
labeled +VDC and -VDC before
servicing board.
400 VOLTS
WARNING
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