Hach sc200 - Page 774

Model 6 Motor Control Centers 80459-641-01E
Section 11—Troubleshooting 10/2012
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ENGLISH
Motor Logic™
Overload Relays
Overload relay trips on
start-up (after more than
3 seconds).
1. Load is too heavy for motor horsepower. 1. Remove excessive motor load or resize motor.
2. Wrong overload trip class selected for
application.
2. Use Trip Class 20 overload relay instead of Trip Class 10.
3. Incorrect overload FLA setting. 3. Set FLA adjustment according to motor full-load current.
4. Use of electronic DC injection brake.
4. Do not use electronic DC injection brakes with solid-state
overload relay.
Overload relay trips on
start-up (in less than 3
seconds).
1. Motor branch circuit fuse blown. 1. Replace blown motor branch circuit fuse(s).
2. Loose motor branch circuit. 2. Tighten motor branch circuit connection.
3. Motor circuit is not 3-phase.
3. Select different type of overload relay for non 3-phase
applications.
4. Voltage unbalance on feeder. 4. Correct voltage unbalance in feeder.
5. Motor winding damage in one or more
windings.
5. Check motor winding impedance. Rewind if necessary.
6. Phase loss in primary of wye-delta or
delta-wye transformer.
6. Replace blown fuses or tighten connections.
7. One or more load lead(s) is not routed
through relay window or is routed in
opposite direction.
7. Pass each load lead through its respective window in the
same direction.
8. Number of load lead passes are different. 8. Each load lead must be looped the same number of passes.
Overload relay trips
while running normally.
1. Load is too heavy for motor horsepower. 1. Remove excessive motor load or resize motor.
2. Incorrect overload FLA setting. 2. Set FLA adjustment according to motor full-load current.
3. Use of electronic DC injection brake.
3. Do not use electronic DC injection brakes with solid-state
overload relay.
4. Incorrect overload FLA setting. (Multiple
pass applications.)
4. Recalculate FLA adjustment and set according to motor
full-load current and number of looped passes.
TeSys™ T
Minor internal faults
Invalid configuration error Indicates either a bad checksum (Config checksum error) or good
checksum but bad data (Invalid config error). Both caused by
hardware failure. Take the following steps:
1. Cycle power and wait 30 s.
2. Reset the configuration settings to factory settings.
3. If the fault persists, replace the TeSys T.
Configuration checksum (EEROM) error
Internal network communications failure These faults indicate a hardware failure. Take the following steps:
1. Cycle power and wait 30 s.
2. If the fault persists, replace the TeSys T.
A/D out of range error
Diagnostic errors
Start command check Check the following:
• relay outputs
• all wiring, including:
– control wiring circuit, including all electromechanical devices
– power wiring circuit, including all components
– load CT wiring.
After all checks are complete:
1. Perform a fault reset.
2. If the fault persists, cycle power and wait 30 s.
3. If the fault still persists, replace the TeSys T.
Stop command check
Stop check back
Run check back
Table 17: Motor Control Center Troubleshooting Chart (continued)
Part Problem Cause Remedy