Siemens Energy & Automation, Inc.
36
Table 8 - Troubleshooting
Trouble Cause Check/Remedy
Motor does not start No main power Check input side of terminals L1, L2 and L3 for open disconnect
and LED 1 is not on. switch, breaker trip, or insecure terminal connections. Verify that
proper three-phase incoming power is present per paragraph
6.5, steps 3, 4 and 6.
No control power Check input side of control terminals X1 and X2 for blown fuse,
any open circuit condition or insecure terminal connections.
Verify that proper control voltage is present (within +10%,-15%
of nominal controller rating). If the control circuit includes a con-
trol power transformer (CPT), verify that the CPT primary voltage
is present and proper for the CPT primary tap.
Motor does not start Motor not connected Check that any series disconnect switch or isolating contact is
and LED 1 is to controller closed.
glowing steadily. Check for tripped overload relay. Determine and remedy cause
of trip per “Motor overload relay trips...” trouble below.
Verify that the motor is connected to the controller. With proper
incoming power and the motor connected but Stopped, volt-
meter readings across terminals T1 and T2,T2 and T3, and T3 and
T1 should be zero. A reading of line voltage indicates that the
motor is not connected properly.
Discontinuity in the Check that control power is present at terminals A1 and control
input circuit A2. If power is not present, check for insecure
wiring to the Run coil connections at terminals A1 and A2, at
applicable control terminals (13, 14, etc.), and at the control
devices (e.g., start-stop device, isolation contact) used in the
input circuit to the Run coil.
Bad cable connection Remove control power and check that Logic PCB-to-Snubber
or defective printed PCB cable is secure. If secure, remove main power and replace
circuit board (PCB) Logic PCB and/or snubber PCB or consult the factory for
component assistance.
Faulty motor Troubleshoot motor according to the manufacturer’s instructions.
Motor does not start
and both LED’s come
on at Run command Inside Delta wiring problem See problem 3 in table 9.
Motor starts but does Controller not finished Check that LED 2 is on, which indicates output voltage equals
not come up to speed ramping to line voltage line voltage. If motor is coming up to speed too slowly, decrease
Start Time T1 and/or increase Initial Voltage U; refer to
paragraph 6.6.
Motor growls or hums Initial Voltage U is set Raise setting of Initial Voltage U until motor just starts to rotate
at start but comes too low when power is first applied; refer to paragraph 6.6.
up to speed
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