Control Techniques Unidrive sp Kurzhandbuch Seite 50

Safety Product Mechanical
Information Information Installation
Trip
O.ht1 Power device over temperature based on thermal model
Reduce drive switching frequency
Reduce duty cycle
21
Decrease acceleration / deceleration rates
Reduce motor load
O.ht2 Heatsink over temperature
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Increase ventilation
22
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
Oht2.P Power module heatsink over temperature
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
Increase ventilation
105
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
O.ht3 Drive over-temperature based on thermal model
The drive will attempt to stop the motor before tripping. If the motor does not stop in 10s the drive
trips immediately.
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
27 Check cubicle door filters
Increase ventilation
Decrease acceleration / deceleration rates
Reduce duty cycle
Reduce motor load
Power module rectifier over temperature or input snubber resistor over temperature (size
Oht4.P
4 and above)
Check for supply imbalance
Check for supply disturbance such as notching from a DC drive
Check cubicle / drive fans are still functioning correctly
Check cubicle ventilation paths
Check cubicle door filters
102
Increase ventilation
Decrease acceleration / deceleration rates
Reduce drive switching frequency
Reduce duty cycle
Reduce motor load
OI.AC Instantaneous output over current detected: peak output current greater than 225%
Acceleration /deceleration rate is too short.
If seen during autotune reduce voltage boost Pr 5.15
Check for short circuit on output cabling
Check integrity of motor insulation
Check feedback device wiring
Check feedback device mechanical coupling
3 Check feedback signals are free from noise
Is motor cable length within limits for that frame size?
Reduce the values in speed loop gain parameters – Pr 3.10, Pr 3.11 and Pr 3.12 (closed
loop vector and servo modes only)
Has offset measurement test been completed? (servo mode only)
Reduce the values in current loop gain parameters - Pr 4.13 and Pr 4.14 (closed loop vector
and servo modes only)
50
Electrical Getting
Menu 0
Installation Started
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Running Advanced
Diagnostics
the motor parameters
Diagnosis
Unidrive SP Short Form Guide
UL Listing
Appendix
Information
Issue Number: 2