2-26 Malfunctions with Indications
CP-15 24V Power
Supply Loss
(Soft)
The 24V power supply was detected at a level
below 18V. This will initiate a coast stop. The 24V
power supply is used to supply the gate firing
circuits and the 24V ECOAST circuitry.
Note: If a constant voltage transformer is used to
supply control power, verify that the output is not a
distorted sine wave. A distorted sine wave could
result in the DC switching power supply to generate
a CP-15.
1. Verify that the 24V power supply is low by measuring the
voltage between TP5 (+24V) and TP23 (common) on the
Power Stage Interface (PSI) Board for Series A (measure
between TP 25 and TP6 on the PSI Switcher board for
Series B). If it is zero, remove all power and check F7 for
continuity. Replace the fuse, if blown, with the proper
rating indicated.
2. If the fault still occurs but the fuse is good, verify that the
24V ECOAST circuit external to the drive is not shorting
out the supply.
3. If the voltage at the test points is correct, execute a
CLEAR FAULT and continue operation. If the fault
reoccurs replace the Main Control Board.
4. If the Fault reoccurs and the fuse was good, but there is
no voltage across the test points, check that
approximately 20Vrms is present from the cathode of D8
to the cathode of D7 on the PSI Board. If it is incorrect,
then the transformer 1PT has failed, and factory repair is
necessary. If it is correct, then power down and replace
the PSI Board.
5. If the fault reoccurs after all of the above, then refer to the
Magnetics/Power Structure section for details on
checking the Pulse Snubber Boards.
CP-16 Autotune Fault
(Soft)
This fault occurs when an internal error is detected
during the Autotune execution. Autotune will be
aborted.
Execute a CLEAR FAULT and attempt normal operation. If
the fault reoccurs, replace Main Control Board.
CP-17 Overcurrent
Reset Fault
(Soft)
Internal hardware error detected. A coast stop will
be initiated.
Execute a CLEAR FAULTS and attempt normal operation.
If the fault reoccurs, replace Main Control Board.
Current Processor Faults
No. Name Description Recovery
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