48
12
Resettable
Fault
12020 N24V UV Flt
Neg 24V Undervoltage Fault. An
undervoltage event occurred in the local
(internal to the PIB) power supply. It
affects the operation of the negative 24V
power supply. The most likely cause is
component failure.
Inspect status indicators on power layer
interface (PLI) circuit board. Replace
the Mn power module or PLI. See
hardware service manual, publication
750-TG100 for PowerFlex 755T or
publication 750-TG101 for PowerFlex
755TS products, for the replacement
procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: No. Emergency
override response: 0:455 [Emerg Prot
OVRD] bit 3 ‘MS Pwr Flts’.
12
Resettable
Fault
12022 Pred NVS Error
Predictive Maintenance Non-Volatile
Storage Error. Data from Electronically
Erasable Read Only Memory (EEROM)
on the power board or DC precharge
board of a power module within the motor
side inverter is corrupt.
Cycle power. If the fault persists,
replace the Mn power module. See
hardware service manual, publication
750-TG100 for PowerFlex 755T or
publication 750-TG101 for PowerFlex
755TS products, for the replacement
procedure.
—
12
Resettable
Fault
12023 CtrlMsgWdog Tout
Control Msg Watchdog Timeout. The
watch dog timer for transmission of the
control message between the main
control board and one of the power
peripherals (power layer interface board
or torque accuracy module) has timed
out.
Power down and then check the fiber-
optic communication connections
(fiber-optic cables and transceivers). If
the fault persists, replace the main
control board. See hardware service
manual, publication 750-TG100 for
PowerFlex 755T or publication 750-
TG101 for PowerFlex 755TS products,
for the replacement procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: Yes. Fault can
automatically reset: No. Emergency
override response: 0:455 [Emerg Prot
OVRD] bit 7 ‘Board Faults’.
12
Non-Resettable
Fault
12025 Incom GateDr Flt
Incompatible Gate Drive Fault. An
incompatible gate drive board is installed.
Inspect status indicators on PLI.
Replace the Mn power module. See
hardware service manual, publication
750-TG100 for PowerFlex 755T or
publication 750-TG101 for PowerFlex
755TS products, for the replacement
procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: No. Emergency
override response: Cannot override
this fault.
12
Resettable
Fault
12026 Ground Flt
Ground Fault. Power layer interface (PLI)
hardware in the power module has
detected a ground fault event. Ground
current is greater than 25% of the power
module rating.
Disconnect motor lead from the
inverter. Perform a motor insulation
test. Run the inverter with no motor
connected. If the inverter faults, replace
the Mn power module. See hardware
service manual, publication 750-TG100
for PowerFlex 755T or publication 750-
TG101 for PowerFlex 755TS products,
for the replacement procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: Yes. Emergency
override response: Cannot override
this fault.
12
Resettable
Fault
12027 Bus OV Flt
Bus OV Fault. The DC bus voltage has
exceeded the maximum value. Monitor
DC bus voltage in parameter 0:3 [DC Bus
Volts]. Possible causes include:
configuration of line side converter,
configuration of DC bus regulator, high
inertia loads, and fast decel times.
For regenerative converters, verify the
regeneration configuration parameters.
For non-regenerative converters,
increase decel time or provide a means
to dissipate excess energy.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: Yes. Emergency
override response: Cannot override
this fault.
12
Resettable
Fault
12028 NTC-U Short Flt
NTC-U Short Fault. The heatsink
temperature sensor (NTC) for the U (T1)
phase of the power module indicates a
short circuit (the value has risen above
150°C). The sensor or circuit is faulty. See
the corresponding parameter in Port 12
[Mn HeatsinkTempU]
Replace the Mn power module. See
hardware service manual, publication
750-TG100 for PowerFlex 755T or
publication 750-TG101 for PowerFlex
755TS products, for the replacement
procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: No. Emergency
override response: 0:455 [Emerg Prot
OVRD] bit 3 ‘MS Pwr Flts’.
12
Resettable
Fault
12029 NTC-U Open Flt
NTC-U Open Fault. The heatsink
temperature sensor (NTC) for the U (T1)
phase of the power module indicates an
open circuit (the value has fallen below
–40°C). The sensor or circuit is faulty. See
the corresponding parameter in Port 12
[Mn HeatsinkTempU]
Replace the Mn power module. See
hardware service manual, publication
750-TG100 for PowerFlex 755T or
publication 750-TG101 for PowerFlex
755TS products, for the replacement
procedure.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: No. Emergency
override response: 0:455 [Emerg Prot
OVRD] bit 3 ‘MS Pwr Flts’.
12
Resettable
Fault
12030 U OverTemp Flt
Heatsink-U OverTemp Fault. The
temperature in the heatsink for the U (T1)
phase of the power module has risen
above 118°C. Possible causes include
loads that require too much current and
power, improper derating for temperature
and altitude, and obstructed airflow. See
the corresponding parameter in Port 12
[Mn HeatsinkTempU]. PowerFlex 755TS
drives have only one heatsink
temperature sensor. The signal from that
sensor feeds the parameters for U, V, and
W phases.
Verify that the drive is sized and
derated correctly. Check the condition
of cabinet air filters. Verify adequate
airflow and the ambient temperature is
within specification. See the technical
data, publication 750-TD100 for
PowerFlex 755T or publication 750-
TD104 for PowerFlex 755TS products.
Coast (Motor Side Inverter).
Additional Fault Action. Fault opens
main circuit breaker: No. Fault can
automatically reset: Yes. Emergency
override response: 0:455 [Emerg Prot
OVRD] bit 3 ‘MS Pwr Flts’.
Table 7 — Fault Codes by Port (cont)
PORT
CONDITION
DISPLAY
TEXT
FAULT ACTION FAULT ACTION
TYPE CODE
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