Chiller Troubleshooting
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ARTC-SVX002A-EN
Phase Monitor Protection
If the chiller fails to power up, eliminate electrical phase
issues by inspecting the phase monitor device located in
the power distribution panel.
When all voltages are acceptable and the phase sequence
is correct the output relay is energized and the LED glows
green. Under-voltages and unbalanced voltages must be
sensed for a continuous trip delay period before the relay
de-energizes. Reset is automatic upon correction of the
fault condition. The output relay will not energize if a fault
condition is sensed as power is applied. The LED flashes
red during the trip delay, then glows red when the output
de-energizes. The LED flashes green/red if phase reversal
is sensed.
If the phase monitor fails to energize (the LED glows red)
check wiring of all three phases, voltage, and phase
sequence. If phase sequence is incorrect, the LED flashes
green/red. To correct this, swap any two line voltage
connections at the mounting socket. No further
adjustment should be required.
Symptoms and Solutions
This section lists the most common troubleshooting
symptoms and the closest potential solution for each. The
“References” column will list a reference within this
manual, if applicable. This is not an exhaustive listing of all
potential causes or resolutions, but represents the best
direction in which to initiate a solution.
Note:
An anti-short cycle timer is included in the client
microprocessor controller to prevent the
compressors from starting until the delay has
elapsed. The microprocessor also provides
minimum compressor run timers. Take these fixed
timer parameters into consideration when
conducting a fault isolation process.
Figure 25.
ABB ACH580 variable frequency drive
Table 15. LED phase monitor diagnostic codes
LED Display
Indication
Glowing green: All voltages are
acceptable and phase sequence is
correct.
Flashing red: Trip delay prior to de-
energizing.
Glowing red: Output has been de-
energized upon fault detection.
Flashing red and green: Phase
reversal is detected.
No power to phase monitor.
1. Symptom: Compressor will not start
Possible Causes
Potential Solutions
Temperature control not in demand
Set point has been reached
Pressure switch open due to low water flow
Condenser side loss of flow; open switch
Low pressure switch open
Low pressure event has occurred
High pressure switch open
High pressure event has occurred
Compressor overload opened
Allow motor to cool and reset; High amp load/floodback
No power to module
Check breakers and fuses; energize from module electrical and control
panel
Phase monitor open or tripped
Over/under 4% to 8%; loss of leg
Breaker tripped
Reset breaker / check amp draw