Hach sc200 User Manual page 774

Model 6 Motor Control Centers
Section 11—Troubleshooting
Table 17: Motor Control Center Troubleshooting Chart (continued)
Part Problem
Overload relay trips on
start-up (after more than
3 seconds).
Overload relay trips on
Motor Logic™
start-up (in less than 3
Overload Relays
seconds).
Overload relay trips
while running normally.
Minor internal faults
TeSys™ T
Diagnostic errors
102
Cause
1. Load is too heavy for motor horsepower. 1. Remove excessive motor load or resize motor.
2. Wrong overload trip class selected for
application.
3. Incorrect overload FLA setting.
4. Use of electronic DC injection brake.
1. Motor branch circuit fuse blown.
2. Loose motor branch circuit.
3. Motor circuit is not 3-phase.
4. Voltage unbalance on feeder.
5. Motor winding damage in one or more
windings.
6. Phase loss in primary of wye-delta or
delta-wye transformer.
7. One or more load lead(s) is not routed
through relay window or is routed in
opposite direction.
8. Number of load lead passes are different. 8. Each load lead must be looped the same number of passes.
1. Load is too heavy for motor horsepower. 1. Remove excessive motor load or resize motor.
2. Incorrect overload FLA setting.
3. Use of electronic DC injection brake.
4. Incorrect overload FLA setting. (Multiple
pass applications.)
Invalid configuration error
Configuration checksum (EEROM) error
Internal network communications failure
A/D out of range error
Start command check
Stop command check
Stop check back
Run check back
Remedy
2. Use Trip Class 20 overload relay instead of Trip Class 10.
3. Set FLA adjustment according to motor full-load current.
4. Do not use electronic DC injection brakes with solid-state
overload relay.
1. Replace blown motor branch circuit fuse(s).
2. Tighten motor branch circuit connection.
3. Select different type of overload relay for non 3-phase
applications.
4. Correct voltage unbalance in feeder.
5. Check motor winding impedance. Rewind if necessary.
6. Replace blown fuses or tighten connections.
7. Pass each load lead through its respective window in the
same direction.
2. Set FLA adjustment according to motor full-load current.
3. Do not use electronic DC injection brakes with solid-state
overload relay.
4. Recalculate FLA adjustment and set according to motor
full-load current and number of looped passes.
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.
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.
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.
© 1999–2012 Schneider Electric All Rights Reserved
80459-641-01E
10/2012