DRIVE FAULTS
96
ERROR/FAULT CODE PROBABLE CAUSE/ — CORRECTIVE ACTION
F930 Motor field current does not increase to near rated amperes
within 6 seconds. Verify motor field current with an independent
clamp-on DC ammeter.
Probable causes:
Motor field not connected.
Not enough voltage available to achieve rated field current. Maximum
Vdc output to motor field is 0.9 X Vac input at terminals A3TB1, AC1 &
AC2. At –10% low line, the maximum Vdc output is 0.8 x Vac. If this
voltage is not enough to produce rated field current through the
resistance of the motor field winding, reconnect the field windings for
lower voltage (and higher current) or provide a step-up transformer for
the motor field circuit as shown in Figure 2.1 of this manual:
Improper settings for the connected motor field. Insure that the proper
current tap at A3TB4 is used, and that calibration switch A3S1 is set
correctly, and that adjustments #49, #50, #52, and #55 are set
correctly.
Faulty SCR/Rectifier power module for motor field. Replace.
*may occur during Self-Tune (Fctn #997) or Self-Diagnostic (Fctn
#998).
F931 Excessive open circuit voltage to motor armature circuit.
Measured armature voltage is greater than 10% of rated volts #7.
Probable Causes:
Motor is rotating, producing CEMF.
Unbalanced SCR leakage with low voltage setting of #7. Increase #7
for test.
Damaged SCR(s)
*may occur during Self-Tune (Fctn #997) or Self-Diagnostic (Fctn
#998).
F932 Armature CEMF volts >20% of rated during test.
Probable causes:
Motor rotating during the test producing CEMF.
High motor armature resistance. Ensure that brush commutator is
clean. Temporarily increase Rated Armature Volts, #7 during the test.
*may occur during Self-Tune (Fctn #997) or Self-Diagnostic (Fctn
#998).
F933 Motor armature current does not increase to near test amps
within 6 seconds.
Probable causes:
Faulty motor armature circuit. Check wiring and motor for open circuit.
Open SCR or missing SCR gating. Perform Self-Diagnostics to verify.
*may occur during Self-Tune (Fctn #997) or Self-Diagnostic (Fctn
#998).
F934 Calculated armature inductance is less than 0.00017 Henry. The
drive will not Self Tune with less than 170 micro-henries of load
inductance. Verify that inductance is really that low. Verify that Vac
value at #9 is correct. Manually enter the minimum value into #5.
Parameter #2 must be set to OFF.
*may occur during Self-Tune (Fctn #997) or Self-Diagnostic (Fctn
#998).
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