Malfunctions with Indications 2-25
CP-08 AC Overcurrent
Trip (Soft)
(Parameter 101
bit 2 when
Parameter
630=0)
This fault occurs when approximately 4 times rated
armature bridge current occurs in the incoming AC
lines. Verify correct burden resistors. It is detected
by the Current Transformers which monitor the AC
lines. An over current condition indicates that
excessive current is flowing in the power structure.
This type of overcurrent fault is usually caused by a
bridge misfire or loss of firing control. A coast stop
is initiated.
Execute a SYSTEM RESET to initiate an Armature Bridge
power-up test which will test for shorted power devices. An
indication will be made if any component malfunction is
detected.
If none is indicated:
1. Initiate normal operation. If the fault reoccurs, check the
current regulator gains for proper set-up. If the gains are
in question execute the Current loop tuning procedure
described under Autotune.
2. Execute a CLEAR FAULT, if the fault reoccurs, a
malfunction exists in the power structure or the motor.
Refer to the Magnetics/Power Structure section for
further details.
CP-09 DC Overcurrent
Trip (Soft) {3.6 to
345 Amp Bridge
Only}
(Parameter 101
bit 3 when
Parameter
630=0)
This fault occurs when approximately 4 times rated
armature bridge current occurs in the DC
connections to the motor. It is detected by a DC
transductor which monitors the DC link. An
overcurrent condition indicates that excessive
current is flowing in the power structure. This type
of overcurrent fault usually indicates that a bridge
misfire or motor commutator flashover has
occurred. A coast stop is initiated.
Execute a SYSTEM RESET to initiate a Armature Bridge
power-up test which will test for shorted power devices. An
indication will be made if any component failure is detected.
If none is indicated:
1. Initiate normal operation. If the fault reoccurs, check the
current regulator gains for proper set-up. If the gains are
in question execute the Current loop tuning procedure
described under Autotune.
2. Execute a CLEAR FAULT, if the fault reoccurs, a
malfunction exists in the power structure or the motor.
Refer to the Magnetics/Power Structure section of this
chapter for further details.
CP-11 Zero Cross
Chann (Soft)
Internal hardware error detected. A coast stop will
be initiated.
Execute a SYSTEM RESET or cycle power and attempt
normal operation. If the fault reoccurs, replace Main Control
Board.
CP-13 Sync Loss (Soft) Ten consecutive failures to synchronize to the
incoming AC lines has occurred. During normal
operation the Current Processor (CP) synchronizes
its firing to the crossing of the AC line waveform.
This fault can be generated by the following
problems:
1. The AC line period varied by more than 0.46ms
since the last measurement.
2. The synchronization origin for the SCR firing
calculations varied by more than 0.46 ms from
the last calculated value.
3. An AC line zero crossing was not detected.
4. Multiple AC line crossings were detected.
If a synchronization malfunctions, the CP will fire on
the estimated crossing for up to ten consecutive
cycles. After ten, the fault occurs and the drive will
initiate a coast stop.
A loss of synchronization is usually linked to variations in
the AC line frequency or excessive noise on the AC lines
due to line notches or other transient conditions. These
conditions must be checked and corrected. Execute a
CLEAR FAULT and continue operation. If the fault reoccurs
and the AC lines are stable and relatively free from noise or
transients replace the Main Control Board.
CP-14 Field Origin
(Soft)
An internal hardware error that initiates a coast
stop.
Execute a SYSTEM RESET or cycle power and attempt
normal operation. If the fault reoccurs replace the Main
Control Board.
Current Processor Faults
No. Name Description Recovery
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