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Table 6
— Powerflex 755 Fault Code Descriptions and Corrective Actions
VFD
FAULT
CODE
ON VFD
HIST
SCREEN
ICVC
FAULT
STATE
FAULT TYPE DESCRIPTION CORRECTIVE ACTION
NONE 206 Processor memory fault Consult VFD manual to resolve generic fault.
0 No Entry
2 207 Auxiliary Input Input is open.
Check Compressor Discharge High Pressure
switch wiring and accuracy.
Check for high condenser water temperatures,
low water flow, fouled tubes.
Check for division plate/gasket bypass. Check for
noncondensables in refrigerant.
3 210 Power Loss Line voltage dropout
Temporary loss of voltage. Disable Single Cycle
Dropout in VFD_CONF sceen.
4 215 Undervoltage Low DC bus voltage
Verify phase-to-phase and phase-to-ground line
voltage. VFD Circuit Board malfunction.
Call Carrier Service.
5 166 Overvoltage High DC bus voltage
Verify phase to phase and phase to ground line
voltage. Monitor AC line for high transient voltage
conditions.
7 217 Motor Overload An internal electronic overload trip has occurred.
Any phase current > 106% RLA. Can result from
significant load side current imbalance when
running at full load.
Check entering condenser water temperature
and water flow rate.
Check Motor Rated Load Amps in VFD_CONF
screen.
8 219
Heat Sink Over-
temp
Heat sink temperature has exceeded the maxi-
mum operating temperature
Check that VFD refrigerant isolation valves are
open.
Check VFD refrigerant cooling orifice and refrig-
erant strainer.
Check for proper VFD cooling fan operation and
air flow blockage.
9 219
Transistor Over-
temp
The output transistors have exceeded the maxi-
mum operating temperature
Check that VFD refrigerant isolation valves are
open.
Check VFD refrigerant cooling orifice and refrig-
erant strainer.
Check for proper VFD cooling fan operation and
air flow blockage.
12 286 HW Overcurrent
The drive output current has exceeded the hard-
ware current limit.
Check for high entering water temperature or low
condenser water flow. Check current settings in
VFD_CONF screen.
13 220 Ground Fault
A current path to earth ground greater than 25%
of drive rating has occurred.
Check the motor, motor terminals, and external
wiring to the drive output terminals for a
grounded condition.
14 206 Ground Warning
The ground current has exceeded the level set in
P467
—
15 206 Load Loss
If this fault appears, there may be a problem with
software configuration.
To reset the processor, cycle power to chiller,
check ICVC VFD_CONF settings and save set-
tings when exiting VFD_CONF screen.
Check VFD parameters with Drive Explorer.
17 216
The DC bus ripple
has exceeded a
preset level.
Line Voltage imbalance
Check phase-to-phase and phase-to-ground dis-
tribution bus voltage. Increase Line Voltage %
Imbalance in VFD_CONF screen.
20 206 TorqPrv Spd Band See VFD Fault Code 15 See VFD Fault Code 15
21 225 Output PhaseLoss
The current in one or more phases has been lost
or remains below a preset level.
Check Motor Current % Imbalance in
VFD_CONF screen.
24 204 Decel Inhibit
The drive is not following a commanded decelera-
tion because it is attempting to limit the bus volt-
age.
Verify input voltage is within drive specified limits.
Verify system ground impedance follows proper
grounding techniques.
Disable bus regulation P186 and/or add dynamic
brake resistor and/or extend deceleration time
P537 and P538.
33 206 AuRsts Exhausted See VFD Fault Code 15 See VFD Fault Code 15
36 286 SW Overcurrent
The drive output current has exceeded the 1 ms
current rating.
Check for excess load, improper DC boost set-
ting, DC brake volts set too high.