Troubleshooting

1. Poor contact in the control circuit.
2. Low voltage.

1. Replace the contact device or use a holding circuit interlock (three-wire control).
2. Check the coil terminal voltage and voltage dips during starting.

1. Abnormal inrush of current.
2. Rapid jogging.
3. Insufficient tip pressure.
4. Low voltage which prevents the magnet from sealing.
5. Foreign matter prevents the contacts from closing.
6. Short circuit or ground fault.

1. Check for grounds, shorts, or excessive motor load current, or use larger contactor.
2. Install a larger device rated for jogging service.
3. Replace contacts and springs. Check contact carrier for deformation or damage.
4. Check the coil terminal voltage and voltage dips during starting.
5. Clean the contacts with an environmentally safe (CFC-free) contact cleaner.
6. Remove the cause of the event. make sure that the fuse and circuit breaker sizes are correct.

1. Filing or dressing.
2. Interrupting excessively high currents.
3. Excessive jogging.
4. Weak tip pressure.
5. Dirt or foreign matter on the contact surface
6. Short circuit or ground fault.
7. Loose connection in the power circuit.
8. Sustained overload.

1. Do not file the silver tips; rough spots or discoloration do not harm tips or impair their efficiency.
2. Install a larger device or check for grounds, shorts, or excessive motor currents.
3. Install a larger device rated for jogging service.
4. Replace contacts and springs; check the contact carrier for deformation or damage.
5. Clean contacts with a CFC-free contact cleaner. Reduce the entry of foreign matter into the enclosure.
6. Remove the cause of the event; ensure that the fuse and circuit breaker sizes are correct.
7. Clear and tighten the connection.
8. Check for excessive motor load current or install a larger device.

1. Overvoltage or high ambient temperature.
2. Incorrect coil.
3. Shorted turns caused by mechanical damage or corrosion.
4. Undervoltage; magnet will not seal in.
5. Dirt or rust on the pole faces.
6. Mechanical obstruction.

1. Check the coil terminal voltage. It should not exceed 110% of the coil rating.
2. Install the correct coil.
3. Replace the coil.
4. Check the coil terminal voltage. It should be at least 85% of the coil rating.
5. Clean the pole faces.
6. With power off, check for free movement of the contact and armature assembly.

1. Sustained overload.
2. Loose or corroded connection in the power circuit.
3. Incorrect thermal units.
4. Excessive coil voltage.

1. Check for excessive motor currents or current unbalance; correct cause.
2. Clean and tighten the connection.
3. Replace the thermal units with the correct size for the application.
4. Voltage should not exceed 110% of the coil rating.

1. Load is too heavy for motor horsepower.
2. Wrong overload trip class selected for application.
3. Incorrect overload FLA setting.
4. Use of electronic DC injection brake.

1. Remove excessive motor load or resize motor.
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. Motor branch circuit fuse blown.
2. Loose motor branch circuit.
3. Motor circuit is not three-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.

1. Replace blown motor branch circuit fuse(s).
2. Tighten motor branch circuit connection.
3. Select different type of overload relay for non three-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.
8. Each load lead must be looped the same number of passes.

1. Load is too heavy for motor horsepower.
2. Incorrect overload FLA setting.
3. Use of electronic DC injection brake.
4. Incorrect overload FLA setting. (Multiple pass applications.)

1. Remove excessive motor load or resize motor.
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.

1. Cycle power and wait 30 s.
2. Reset the configuration settings to factory settings.
3. If the condition persists, replace the TeSys T motor controller.

1. Cycle power and wait 30 s.
2. If the condition persists, replace the TeSys T motor controller.

• Relay outputs.
• All wiring, including:

  • Control wiring circuit, including all electromechanical devices.

  • Power wiring circuit, including all components.

  • Load CT wiring.

1. Perform a reset.
2. If the condition persists, cycle power and wait 30 s.
3. If the condition persists, replace the TeSys T motor controller.

• All external CTs face the same direction.
• All load CT wiring passes through windows in the same direction.

1. Perform a reset.
2. If the condition persists, cycle power and wait 30 s.
3. If the condition persists, replace the TeSys T motor controller.

• L1, L2 and L3 wiring connection to be sure wires are not crossed.
• Motor Phases Sequence parameter setting (ABC versus ACB).

1. Perform a reset.
2. If the condition persists, cycle power and wait 30 s.
3. If the condition persists, replace the TeSys T motor controller.

• Improper wiring, such as loose terminations.
• Blown fuse.
• Cut wire.
• Single-phase motor configured for three-phase operation.
• Single-phase motor not wired through both A and C load CT windows.
• Loss of power source (for example, utility power outage).

1. Perform a reset.
2. If the condition persists, cycle power and wait 30 s.
3. If the condition persists, replace the TeSys T motor controller.

• Relay output

• All wiring, including:

  • Control wiring circuit, including all electromechanical devices

  • Power wiring circuit, including all components

  • Load CT wiring

1. Perform a reset.
2. If condition persists, cycle power and wait 30 seconds.
3. If the condition still persists, replace the TeSys Tera motor controller.

Correct the polarity of the CTs. Be sure that:

• All external CTs face the same direction

• All load CT wiring passes through the windows in the same direction

After all checks are completed:

1. Perform a reset.

2. If the condition persists, cycle power and wait 30 seconds.

3. If the condition still persists, replace the TeSys Tera motor controller.

Check for:

• L1, L2 and L3 wiring connection to be sure wires are not crossed

• Motor Phases Sequence parameter setting (ABC versus ACB)

After all checks are completed:

1. Perform a reset

2. If the condition persists, cycle power and wait 30 s.

3. If the condition still persists, replace the TeSys Tera motor controller.

Check for:

• Short circuit or open circuit in the motor temp sensor wiring

• Wrong type of motor temp sensing device

• Improper configuration of parameters for selected device

After all checks are completed:

1. Perform a reset.

2. If the condition persists, cycle power and wait 30 seconds.

3. If the condition still persists, replace the TeSys Tera motor controller.

Check for:

• Improper wiring, such as loose terminations

• Blown fuse

• Cut wire

• Single-phase motor configured for 3-phase operation

• Single phase motor not wired though both A and C load CT windows

• Lose of power source (for example, utility power outage)

After all checks are completed:

1. Perform a reset.

2. If the condition persists, cycle power and wait 30 seconds.

3. If the condition still persists, replace the TeSys Tera motor controller.

1. Check the RJ11 LTMT9RJ105 is connected properly between LTMT main unit and Sensor module.

2. Replace RJ11 LTMT9RJ105 and check.

3. Replace Sensor module and check.

4. Replace LTMT main unit.

1. Check device configuration setting for LTMT expansion module. Check detected LTMT epxansion lmodule on DTM 'my device' tab.

2. Check if the RJ45 cable is connected properly between LTMT main unit and Expansion module.

3. Replace RJ45 cable and check.

4. Replace LTMT expansion module and check.

5. Replace LTMT main unit.

1. Check device configuration setting for LTMT expansion module.

2. Check detected LTMT expansion module on DTM 'my device' tab.

3. Check LTMTCT…UT/LTMTCTVT…UT and LTMTZCT22.. are not configured together.

4. Make correct configuration and check.

1. Broken shading coil.
2. Dirt or rust on magnet faces.
3. Low voltage.

1. Replace the magnet and armature.
2. Clean the magnet with a clean, dry cloth.
3. Check the coil terminal voltage and voltage dips during starting.

1. No control voltage.
2. Low voltage.
3. Mechanical obstruction.
4. Open or overheated coil.
5. Wrong coil.

1. Check the control circuit wiring for a loose connection or poor contact continuity.
2. Check for the proper coil terminal voltage and voltage dips during starting.
3. With the power off, check for free movement of the contact and armature assembly.
4. Replace the coil.
5. Replace the coil.

1. Gummy substance on the pole faces.
2. Voltage not removed.
3. Worn or corroded parts causing binding.
4. Residual magnetism due to the lack of an air gap in the magnet path.
5. Welded contacts.

1. Clean the pole faces with a clean, dry cloth.
2. Check the coil terminal voltage and the control circuit.
3. Replace the parts.
4. Replace the magnet and armature.
5. See Contacts—Welding or Freezing.

1. Maladjustment of the actuating screw.
2. Worn or broken parts in the snap switch.

1. Adjust according to the instructions in the service bulletin.
2. Replace the snap switch.