JOHNSON CONTROLS
180
SECTION 9 - MAINTENANCE
Form 201.47-ICOM1
Issue date: 17/11/2022
Table 32 - Troubleshooting guide (cont'd)
Problem Possible cause Action
System status:
Motor current limiting
A high motor current anticipatory control
has activated current limiting
Ambient temperature is high, normal
response from controller
Remote or panel limiting is in eect,
Normal response.
Excess charge in system, adjust charge.
Condenser coils dirty, Clean condenser.
Fans not operating. Check fans.
VSD fault:
High baseplate temperature
Coolant level low. Add coolant.
Glycol pump is defective. Replace Glycol Pump.
VSD Board is defective. Replace VSD Logic Board.
IBGT Module is defective. Check defective IGBT Module.
VSD cooling coil not clean. Clean VSD cooling coil.
VSD fault:
Low DC Bus voltage
SCR/Diode Module is defective. Check SCR/Diode Module.
SCR Trigger Board is defective. Check SCR Trigger Board.
Note: Always remove power to the chiller and ensure the DC Bus voltage has bled o.
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