Johnson Controls YVAHP0721CW Series, Service Manual

Page: 258 / 416

SM-16007
TROUBLESHOOTING
Is the supply voltage 208-230V/60Hz+10%
or 460V/60Hz+10% ?
Is the compressor
running current
same as activation
current? *4)
Check
diode module. *3)
Restart operation.
Does it trip soon?
Are the input currents
of three phases nearly
equal? (+3%)
Yes
Yes
Yes
Yes It trips.
No
No
No
No
No
No (Input currents out of balance.)
It trips
immediately.
Faulty
Good
Check the
compressor.
Check the power
source capacity.
Is there any cause
of instantaneous
voltage drop?
It trips
occasionally.
It trips after a
certain period.
Check the
compressor.
Replace
diode module. *1)
Replace
inverter PCB. *1)
Replace
inverter PCB. *1)
Replace
diode module. *1)
Check the power
supply.
Yes (Input currents nearly equal (+3%).)
Yes
Yes
Yes
No
No
No
Check the capacity
and wiring of the
power source.
Check
diode module. *2)
Replace
inverter PCB. *1)
Faulty
Normal
Check
inverter PCB *1)
Normal
Replace
inverter PCB. *1)
Faulty
In case of 208-230V/60Hz:
Is it 177V or more during operation?
In case of 460V/60Hz:
Is it 391V or more during operation? *1)
In case of 208-230V/60Hz:
Is it 177V or more during operation when other devices are operating?
In case of 460V/60Hz:
Is it 391V or more during operation when other devices are operating?
*1)
Turn OFF power and
disconnect U, V, W from
compressor terminals.
Turn ON #1 of DSW1 on
inverter PCB to cancel
0A detection and restart.
Does it trip?
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