Emerson Affinity - Page 254

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254 Affinity User Guide
www.controltechniques.com Issue Number: 5
It.AC
Output current overload timed out (I
2
t) - accumulator value can be seen in Pr 4.19
20
Ensure the load is not jammed / sticking
Check the load on the motor has not changed
Ensure rated speed parameter is correct (RFC)
Ensure that the motor rated current is not set to zero
It.br
Braking resistor overload timed out (I
2
t) – accumulator value can be seen in Pr 10.39
19
Ensure the values entered in Pr 10.30 and Pr 10.31 are correct
Increase the power rating of the braking resistor and change Pr 10.30 and Pr 10.31
If an external thermal protection device is being used and the braking resistor software overload is not required, set Pr 10.30 or
Pr 10.31 to 0 to disable the trip
LOAD Low load detected
38 Check mechanical motor coupling
O.CtL Drive control board over temperature
23
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Check ambient temperature
Reduce drive switching frequency
O.ht1 Power device over temperature based on thermal model
21
Reduce drive switching frequency
Reduce duty cycle
Decrease acceleration / deceleration rates
Reduce motor load
O.ht2 Heatsink over temperature
22
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
Oht2.P Power module heatsink over temperature
105
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
O.ht3 Drive over-temperature based on thermal model
27
The drive will attempt to stop the motor before tripping. If the motor does not stop in 10s the drive trips immediately.
Check DC bus ripple
Reduce duty cycle
Reduce motor load
Oht4.P Power module rectifier over temperature or input snubber resistor over temperature (size 4 and above)
102
Check for supply imbalance
Check for supply disturbance such as notching from a DC drive
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
Trip Diagnosis