Carrier X-POWER Series - Page 167

Carrier service manual R410A DC Inverter Series
Troubleshooting 185
P9 protection analysis
Conditions
Fault indicator
lamp of fan
module
Power supply
indicator lamp
of fan module
Digital
tube
display
Malfunction analysis
Power on Off Off
Quantity
of IDU or
“0”
Check the power supply circuit for fan module.
Check whether there has power supply for lightning
protection plate, whether the protective tube is broken,
whether the voltage after rectification is normal, whether the
bridge rectifier is broken.
Power on Off Flicker
Quantity
of IDU or
“0”
Power supply of fan module has problem, needs to replace
the fan module.
When fan
motor start
At first the lamp
is on then the
lamp is off
On P9/H9
Check whether the drive port and signal feedback port is
loose, whether the fan module and fan motor is installed
firmly. If above conditions are all OK, it needs to replace the
fan module.
When fan
motor start
At first the lamp
is on then the
lamp flicker
On P9/H9
Check whether the transformer in lightning protection plate
Is open circuit, whether the relay is broken. If occurs above
problem, it needs to replace the lightning protection plate.
Fan motor
running
several
minutes
On On P9/H9
Check whether the capacity setting from dial switch is
accordance with actual ODU capacity, whether the capacity
from spot check is accordance with actual ODU capacity. If
occurs above problem, it needs to adjust the capacity
setting. If above conditions are both OK, it needs to replace
the PCB.