12
Fig. 17 — MCB (Main Control Board) Components
Fig. 18 — High-Pressure Switch Wiring
DPI PORT 02 (COMPUTER PORT)
DIGITAL INPUT TERMINAL BLOCKS
(SLOTS 04 & 05)
ETHERNET/IP ADDRESS SWITCHES
DIGITAL OUTPUT TERMINAL BLOCKS
(SLOTS 04 & 05)
EMBEDDED ETHERNET/IP PORT
MCB I/O TERMINALS
(AUX FAULT /
HIGH PRESSURE FAULT /
ENABLE INPUT)
*Located outside of starter; connected by field wiring.
a19-1925
Table 5 — Powerflex 755 Fault Code Descriptions and Corrective Actions
VFD
FAULT
CODE
ON VFD
HIST
SCREEN
ICVC
FAULT
STATE
PIC6
FAULT
STATE
FAULT TYPE DESCRIPTION CORRECTIVE ACTION
NONE 206 449 Processor memory fault Consult VFD manual to resolve generic fault.
0 No Entry
2 207 439 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.
3 210 425 Power Loss Line voltage dropout
Temporary loss of voltage. Disable Single Cycle
Dropout in VFD_CONF (PIC III)/CFGUMVFD
(PIC6) screen.
4 215 429 Undervoltage Low DC bus voltage
Verify phase-to-phase and phase-to-ground line
voltage. VFD Circuit Board malfunction.
Contact Carrier Service.
5 205 (166) 430 Overvoltage High DC bus voltage
Verify phase to phase and phase to ground line
voltage. Monitor AC line for high transient volt-
age conditions.
7 217 434 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
(PICIII)/CFGUMVFD (PIC6) screen.
8 219 444
Heat Sink
Overtemp
Heat sink temperature has exceeded
maximum 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.
9 219 444
Transistor
Overtemp
The output transistors have exceeded
maximum 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.
12 286 438 HW Overcurrent
The drive output current has exceeded
hardware current limit.
Check for high entering water temperature or low
condenser water flow. Check current settings in
VFD_CONF (PIC III)/CFGUMVFD (PIC 6)
screen.
13 220 432 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.
14 206 432 Ground Warning
The ground current has exceeded the
level set in P467.
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