Motor overtemperature (T1/T2)

What does OH8 mean?

The motor temperature, measured via inputs T1 and T2, is too high. This signifies thermal overload due to impermissible continuous current or frequent/prolonged acceleration processes. It can also occur if terminals T1 and T2 are not connected to a PTC/temperature contact.

• Motor temperature sensor (T1/T2) indicates an overtemperature condition.
• Excessive motor current draw causing rapid temperature rise.
• External motor cooling system failure.
• Poor thermal contact between sensor and motor windings.

Click steps to track your progress.

1. 1

   Check drive dimensioning to ensure the motor is not continuously overloaded.

2. 2

   Connect the PTC/temperature contact if terminals T1 and T2 are not connected.

3. 3

   Switch off monitoring by setting C0585 = 3.