Malfunctions with Indications 2-15
VP-13 Motor Field
Tolerance (Soft)
(Parameter 101
bit 3 when
Parameter
630=1)
This fault occurs when the field current feedback is
less than 50% of the field current reference for the
time specified by the field loss delay period.
Internally, parameter 118 “Fld Current Fdbk” and
parameter 117 “Fld Current Ref” are compared and
if the feedback is less than 50% of the reference,
for a time delay specified in parameter 730 “Fld
Failure Dly”, the fault occurs. A coast stop will be
initiated. If Fld Current Fdbk < 50% Fld Current Ref
(for delay time); Then fault on VP-13 Motor Field
Tolerance.
Field loss detection can be disabled by setting Bit 6
of parameter 627 “Flux Mode Select” to 1. This
feature could be implemented in applications
where external field supplies or permanent magnet
motors are used. When Bit 6 is set to a value of 0,
field loss detection is active.
The field current to the motor cannot be maintained at the
commanded level. The following may have contributed.
1. The loss of continuity in the field wiring connections.
Check the field connections at the drive, 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 as
outlined in the instruction manual.
The value of parameter 612 should be less than 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.
3. Improper connection of the motor field windings. Check
the motor manufacturers data sheet concerning proper
wiring of the windings in respect to applied voltage and
field resistance. Remove all power prior to inspecting or
changing field connections.
4. One or more of the Field Supply fuses are open. This is
usually annunciated on Series A by a synchronization or
phase loss fault. Remove all power prior to checking the
continuity of the fuses. Replace blown fuses with the
proper rating indicated, before attempting continued
operation.
5. A malfunction in the field power structure and control
boards. Power down and check the power devices and
driver boards following the procedure outlined in the
Magnetics/Power Structure section concerning the field
components.
6. The input to the field bridge is phase sensitive. Verify L1 &
L3 are wired correctly.
7. Change the Main Control Board.
Velocity Processor Faults
No. Name Description Recovery
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