Applicable Systems
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Symptoms

The TeSys T motor management controller reports motor over-temperature via the PT100 input. The controller trips the contactor and the MOTOR TEMP LED turns red. The motor surface is >75C.

Possible Causes

  • Motor cooling fan blocked or damaged
  • High ambient temperature in the PrismaSeT enclosure (>45C)
  • Excessive starts per hour causing cumulative heating
  • Incorrect PT100 threshold setting for the motor insulation class

Troubleshooting Steps

  1. Step 1: Inspect and clean the motor cooling fan and ventilation passages
    Air flows freely and the fan runs smoothly without noise
  2. Step 2: Measure the ambient temperature inside the PrismaSeT cabinet and verify enclosure ventilation
    Cabinet temperature is <45C and vents are unobstructed
  3. Step 3: Review the motor duty cycle and compare starts per hour against the nameplate
    Start count is within the allowed duty cycle (typically 3-6 starts/hour)
  4. Step 4: Verify the TeSys T temperature threshold is set 10-20C below the motor insulation class limit
    Class F motor (155C) has alarm at 130C and trip at 140C

How to Reset

Allow the motor to cool for at least 20 minutes. Reset the TeSys T by pressing the reset button or via Modbus command. Re-energize the contactor after confirming the temperature is below the alarm threshold.

Common Replacement Parts

  • LTMR08EFM: Schneider TeSys T motor management controller (Includes LTMR base unit and LTME expansion for PT100 input)

Frequently Asked Questions

  • Q: What is the maximum cable length for PT100 to TeSys T?

    Up to 100 m with shielded cable and 3-wire or 4-wire connection to compensate for lead resistance.

  • Q: Can I use a thermistor instead of PT100 with TeSys T?

    Yes. The LTME expansion supports both PT100/PT1000 RTDs and PTC thermistors. Configure the input type in the software.

Related Schneider Electric Fault Codes

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Source: Schneider Electric PrismaSeT Technical Guide, GDE0001

Category: Electrical