2-24
Malfunctions with Indications
CP-06
Phase Loss
(Soft)
(Parameter 101
bit 0 when
Parameter
630=0)
The drive has detected that one or more of the
incoming three-phase AC lines is open. A coast
stop will be initiated.
Below are a list of conditions that may have contributed to
the occurrence of the fault.
1. The loss of a phase from the source. To verify this,
measure the AC voltage present at the incoming fuses.
Measure line 1 to 2, line 2 to 3, and line 1 to 3 on the
incoming side of the protection device to determine which
if any phases are missing. Correct the condition before
attempting continued operation.
2. One or more of the main protection fuses (F1-F3) are
open. Remove all power prior to checking the continuity
of the fuses. Reset the circuit breaker or replace the
blown fuses, with the proper rating and type as indicated,
before attempting continued operation.
3. One or more of the Field Supply Fuses are open.
Remove all power prior to checking the continuity of the
fuses. Check the field SCRs. Replace the blown fuses
with the proper rating and type indicated, before
attempting continued operation. (Applicable to Series A
only).
4. Execute a CLEAR FAULTS to continue operation. If the
fault reoccurs a transient condition may be present in the
incoming AC line. Monitor the AC lines for excessive line
notches or other transients. If the fault reoccurs and no
transients exist, replace the Main Control Board. If the
fault reoccurs replace the Feedback Board.
5. In some instances, one of the AC line voltages may be
lost at the source, however this may be difficult to detect
due to other three-phase equipment operating on the
same source. The missing line may be generated by an
AC motor operating on the same source. Under no load
conditions the voltage may appear normal but then the
line may collapse once the current draw is increased. A
motor as small as a three-phase blower motor mounted
on the DC motor can produce the missing phase until a
load is placed on the AC line.
6. Check the PE & TE grounding. Determine if the XO
connection on the isolation transformer is grounded.
CP-07
Overcurrent Trip
(Soft)
(Parameter 101
bit 4 when
Parameter
630=0)
This fault occurs when approximately 4 times rated
armature bridge current occurs in either the
incoming AC lines or the DC connections to the
motor. This over current condition indicates that
excessive current is flowing in the power structure.
Verify correct burden resistors. 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 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 of this
manual for further details.
3. If this fault reoccurs at high speed, verify that the motor
commutation limit, based on the velocity and armature
current levels of the motor, has not been exceeded.
Current Processor Faults
No.
Name
Description
Recovery
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