2-20 Malfunctions with Indications
VP-32 Motor Field Loss
(Parameter 101
bit 6 when
Parameter
630=0)
This fault occurs if the field current reference
(parameter 117) is greater than the field current
threshold (parameter 729) and the field current
feedback (parameter 118) is less than 10% of the
threshold.
The field current to the motor cannot be maintained at the
commanded level. Below are a list of things that may have
contributed to the occurrence of the fault.
1. The loss of continuity in the field wiring connections.
Check the terminals as outlined in the following table. The
field connections at the motor and any connections that
may exist in between.
2. Improper values in the field setup parameters. Parameter
612 “Rate Fld Motor Cur” should have the specified motor
nameplate rating of the field entered. Parameter 616
“Rated Fld Brdg I” should reflect the field output rating of
the particular drive based on the selection of jumper J1 for
field current selection. The value of parameter 612 should
be less than parameter 616 for proper operation. If it is
greater, remove all power and move the jumper to the next
higher rated position and enter the corresponding output
field bridge rating into parameter 616.
VP-34 Waiting Safe Arm
Voltage
(Selectable)
(Parameter 101
bit 8 when
Parameter
630=0)
Fault occurs when the armature CEMF is too high
to allow successful commutation during a forward
to reverse bridge change. If Soft Fault is selected
then a fault occurrence will cause a coast stop. If a
Warning Fault is selected then an occurrence will
cause the motoring bridge to be held off, allowing
the motor to coast to a lower CEMF, when an
acceptable level is reached, the drive will allow a
bridge change and operation will continue.
Determine the cause for the excessive armature CEMF and
correct. It may be due to incorrect field control setup. This
can especially be true when this fault occurs during
operation above base speed when the drive is in Field
Weakening mode and the Field Flux Table Set-up was
improperly calibrated. Review the Start-up Procedure and
verify that all parameters are properly entered and that the
calibration parameters were properly setup. Execute a Clear
Fault to continue operation.
VP-35 Waiting Zero
Arm Current
(Selectable)
(Parameter 101
bit 9 when
Parameter
630=0)
This fault occurs when the armature current does
not go to zero when a bridge change is
commanded. If Soft Fault is selected then a fault
occurrence will cause a coast stop. If a Warning
Fault is selected then an occurrence will cause the
drive to continue to attempt to force the current to
zero. When zero current is achieved the drive will
allow a bridge change and operation will continue.
Verify that the armature current loop was properly tuned
following the procedure outlined in the chapter on Start-Up
Procedures. Execute a Clear Fault to continue operation.
Note that a malfunctioning encoder could cause a VP-35.
VP-36 Excess Arm
Voltage
(Warning)
(Parameter 101
bit 10 when
Parameter
630=0)
This Warning occurs when the CEMF of the motor
is too high to allow more armature current to be
generated. It is used to indicate that the armature
firing angle is at it’s end stop and cannot be phased
forward anymore. The level of armature current
cannot be increased until the CEMF is reduced.
This Warning may occur if the incoming line
voltage is low, or excessive CEMF exists due to
improper field weakening control or excessive
speed.
No action is required for continued operation. It may be
advantageous to determine the cause for the high armature
current demand at high armature voltage.
1. Check status of parameter 627, bit 7 (no flux
compensation).
2. Verify the flux table is correct.
3. Check encoder signals.
Note: This warning fault can be disabled. Refer to parameter
632.
Velocity Processor Faults
No. Name Description Recovery
Motor Field Connections (CCW Rotation
Drive
Drive Terminal
Connection Motor Lead
1-30 HP, 230V AC
2-60 HP, 460V AC
TB1-3
TB1-4
F1 (+)
F2 (–)
40 - 100 HP 230VAC
75 - 200 HP 460VAC
TB2-
TB2-2
F1 (+)
F2 (–)
125-300 HP, 230V AC
250-600 HP, 460V AC
TB7-1
TB7-3
F1 (+)
F2 (–)
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