Siemens MCC-3298 - Manual (Page 43)

41
4 Troubleshooting
Troubleshooting Guide
Error Condition Main Cause Remedy
Ground Fault Indicates the ground fault current
exceeded the threshold. If ground fault
protection was selected, the ground
fault LED illuminates solidly and the
motor stops. If ground fault warning
was selected, the ground fault LED
flashes and the motor continues to run. The cause of the ground fault should be determined
and removed before using the motor again. F16 on
the HHC displays the ground fault trip current.
Ready Light not
Illuminated Usually indicates lack of control power. 1.
2.
3.
Verify the presence of 12 VAC between terminals 5
and 6 of the SAMMS-LV unit.
If control power is not present, check the control
power fuses or the control power transformer and
replace if defective.
If control power is present, push the RESET button to
test lights and unit. If the Ready light does not
illuminate, call Siemens.
Improper Remote
Operation Indicates connection or operator error. 1.
2.
3.
Verify the SAMMS-LV unit is in the Auto mode.
Verify 115 VAC input at SAMMS-LV terminals 9, 10,
11, and 12 with reference to 13, and at terminal 7
with reference to 13.
If remote operation is intermittent, verify connections
are made in a manner to avoid noise interference.
Refer to Section 2 of this manual for instructions.
Improper Alarm
Contact Operation Indicates connection error. Verify 115 VAC at terminals 7 and 8 with reference to
13.
Improper Light
Operation Usually indicates programming error. 1.
2.
Perform lamp test by pressing RESET button.
Verify ladder diagram.
Improper Local
Operation Operator error. Verify SAMMS-LV is in Local mode.
Improper Contactor
Operation Connection error. Verify 115 VAC at terminal 7 with reference to 13,
and at output terminals 14, 15, or 16 with reference
to 13 when the motor is started.
Cannot Change
HHC Settings Usually indicates motor is running, or
incorrect password. 1.
2.
Verify that the motor is stopped before changing
parameters.
Verify that the correct password is in use. If the
password cannot be determined, call Siemens.
Improper
SAMMS-LV
Operation Usually indicates improper grounding
or noise interference. Refer to Section 2 of this manual for instructions.