Cause : Braking chopper IGBT temperature has exceeded internal alarm limit.

Let chopper cool down.
Check for excessive ambient temperature.
Check for cooling fan failure.
Check for obstructions in the air flow.
Check the dimensioning and cooling of the
cabinet.
Check resistor overload protection function
settings, parameters 48.01...48.05.
Check that braking cycle meets allowed
limits.
Check that drive supply AC voltage is not
excessive.