Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 457)

Troubleshooting 7-19
7000 “A” Frame 7000A-UM150F-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
Mstr Xfr Err 46 Master transfer Error
This is applicable to parallel drive only – The master drive cannot find a slave
drive able to take over as master
– Possible causes are: slave drive not
ready, or slave drive masked off
Mtr Cap OV 44 Motor filter capacitor Over Voltage fault.
This is for ESP application – This is drive output Voltage [Surface
voltage terminology used in ESP
application]. The drive gives this fault in
an ESP application only.
– The protection uses P#181 setting but
drive calculates the motor filter cap
voltage [Surface V] which is different
from motor voltage in ESP application.
– Check the voltage sensing board for any
resistor failure
– Check for any open circuit at the drive
output.
– Check the devices at the inverter.
MV in Gate Test 26 The drive has Medium Voltage applied and
the user attempted to place the drive in
Gating Test mode. – Check input contactor control and Status
– Ensure that the isolation switch is in the
open position and locked out – Confirm
with hot-stick and status parameters
MV in System Test 27 The drive has Medium Voltage applied and
the user attempted to place the drive in
System Test mode.
– Check input contactor control and Status
– Ensure that the isolation switch is in the
open position and locked out – Confirm
with hot-stick and status parameters
No DO/OP Ctctr 37 This fault is specifically used for Open
Circuit Test Mode, which demands that an
Output Contactor be specified in IsoSw/Ctctr
Cfg (P192). If the contactor is not specified,
you will get this fault in Open Circuit Test
Mode. This is to help avoid inexperienced
people putting the drive in open circuit test
mode without actually open circuiting the
output with either a contactor or by
disconnecting the cable.
– If there truly is no Output Contactor in the
system, then you can mask the fault.
Then there will be a No DO/OP Ctctr
warning, and you can continue with the
test.
Open Cct UV 36 Under Voltage during open circuit test – During open circuit test mode the drive
trips on this fault if difference between
flux command base speed value and
drive output voltage is more than 40%,
and speed ramped to 95% of the line
frequency.
– Check if any short circuit at the drive
output
– Make sure motor is not connected
OutPut Open 43 DO or OP open fault – Drive sees DO or OP contactor open.
– Check for open circuit at the drive output
PD Capcty Lo 47 Parallel Drive Capacity Low.
This is applicable to parallel drive only – The available drive capacity is less than
50% of the motor rated current. The
drive cannot run.