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Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control User Manual

Page 491

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Troubleshooting

7-7

7000 “C” Frame

7000L-UM300I-EN-P – June 2013

FAULT

MESSAGE

FAULT

CODE

DESCRIPTION

RECOMMENDED ACTIONS

DC Link Flow Low

(C-Frame Only)

231

The flow switch in the DC Link coolant path
has detected the flow is less than optimal,
indicating a problem with the flow path. This

is not designed to specifically measure flow.
This is a switch that differentiates between
flow and no flow.

– Verify pressure values in the cooling

system are nominal

– Verify the cooling path is not restricted

because of tube crimping

– Check flow switch for proper operation
– It may be required to disconnect cooling

path and complete a check on the DC
Link for blockages

DC Link OC HW

170

The measured I DC Link Feedback (P322)
has exceeded DC Overcurrent Trip (P169)
or 75% of the device rating, whichever is

lower. The drive faults instantaneously.

– Verify that the parameters for drive and

device ratings, and installed current
sensing components are set accordingly

– Verify that the DC Link LEM is wired

properly and properly powered

– Verify the Burden Resistor value
– Complete a DC Current Test to verify the

feedback corresponds to the IDC
Command

– 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 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.

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