Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 429)

Troubleshooting 7-7
7000 “B” Frame 7000-UM150I-EN-P – June 2013
FAULT
MESSAGE
FAULT
CODE
DESCRIPTION RECOMMENDED ACTIONS
DC Link OC SW 171 The Measured I DC Link Feedback (P322)
has exceeded DC Overcurrent Trip (P169)
for the duration set in DC Overcurrent Delay
(P170). This fault should never occur on it‟s
own, but only after a DC Link OC HW fault.
– Setup trending to capture DC Link
Feedback and other related read-only
parameters (Contact factory if you
require assistance)
– Check Alpha Line, and verify that the
value is not too low (15  ) and the current
regulator is not in limit; Decrease Flux
Command Base Speed or increase
incoming Line Voltage
– Restart the drive to allow the start up
diagnostics to detect any shorted
thyristors, but only attempt this once if
shorted SCRs are detected
DC Link OT 137 The thermal switch in the drive DC Link
Reactor has detected an over-temperature
and has opened. There is a thermal switch in
each DC Link winding, and they are
connected in series.
– Verify operating conditions (ambient/
altitude/ load levels/ ventilation and fans)
and verify that the DC Link Reactor is
within ratings
– Check the 120V signal through the
thermal switch
– Verify the drive cooling circuit is
operating correctly (Air Pressure value or
liquid-cooling path)
– Check the XIO board inputs and
parameter status bits
– Determine through elimination whether
there is a faulty switch and replace if
necessary
DC/DC Fail 155 The last of the 5VDC or the 15VDC supplies
from the DC/DC power supply to the drive
control logic has failed, or any of the other
voltages that are non-redundant have failed.
This fault means that you will have no
voltage on a required output.
– Measure the input voltage to the DC/DC
power supply and verify it is at 56VDC
– Measure the output voltage and compare
to expected values listed in Chapter 4 of
the User‟s Manual
– Verify fault detection wiring is per the
drawings, and measure the voltage on the
trip signals back to the CIB. The 5VDC is
supplied from the CIB to the fault circuit,
and is pulled low on the power supply
when healthy.
– Verify the output from the alarm signal is
wired correctly.
– If 5V DC signal from CIB is not pulled low
when connected to the DC/DC power
supply, then the power supply is the
cause. Replace the power supply.