Troubleshooting 3-35
7000-TD002A-EN-P – September 2007
WARNING
MESSAGE
WARNING
CODE
DESCRIPTION RECOMMENDED ACTIONS
Bypass OvrVolt 141 The measured line voltage Bypass Voltage
pu (#P117) has exceeded the Line OvrVolt
Trip (P165) setting. Synchronous transfer
has been disabled.
– Verify the parameters are set properly
– Check for possible line voltage
transients
– Verify VSB connections and tap settings,
resistor values, and grounds
– If voltage is too high, change tap
settings on the input source to lower
voltage to an acceptable level
Bypass Phase Seq 144 The bypass phase sequence does not
match the phase sequence of the input to
the drive. Synchronous transfer has been
disabled.
– The drive will not allow a synchronous
transfer unless the phasing is the same
– Confirm the phase sequences and swap
cables if necessary
Bypass UnderVolt 142 The measured bypass voltage Bypass
Voltage pu (#P117) is less than the Line
UndVolt Lvl (P167) setting. Synchronous
transfer has been disabled.
– Verify the VSB connections and tap
settings, and check resistance of VSB
board – Megger board to confirm integrity
– Check for possible source voltage
supply problems
– Use Multimeter and Oscilloscope to
check voltages on the drive test points
Bypass VoltUnbal 143 The measured unbalance in the Bypass
Voltage has exceeded the trip setting
(P271). Synchronous transfer has been
disabled.
– Verify the VSB connections and tap
settings, and check resistance of VSB
board – Megger board to confirm integrity
– Check for possible source voltage
supply problems
– Use Multimeter and Oscilloscope to
check voltages on the drive voltage test
points
ConductivityHigh
(C-FRAME ONLY)
37 This warning is for liquid cool drives. The
drive indicates that the measured coolant
conductivity is greater than 1 μS/cm
3
. Verify
that there is no debris in the coolant, and
replace the de-ionizing cartridge if
necessary
– Verify that no foreign debris has entered
the system (iron piping, non-deionized
water, etc.)
– There is no immediate need for action,
but be prepared to change the de-ionizing
cartridge and run the system, verifying
that the conductivity is decreasing
Control Pwr Loss 112 This is used in the Autorestart feature
algorithm as an indicator to tell the drive to
stop gating and wait for control power to
return. This alarm is for drives engineered
with a UPS option. There has been a loss or
dip in the control power feeding the drive for
more than 5 cycles.
– Investigate reliability of the control power
– Ensure the drive operates as expected
when there is a control power outage
(UPS must be installed)
– Ensure that the power source is active
and investigate the reliability of the
source.
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