Control Techniques unidrive sp Advanced User's Manual page 169

Parameter Keypad and
Menu 10
structure display
Trip
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
Check cubicle door filters
27
Increase ventilation
Decrease acceleration / deceleration rates
Reduce duty cycle
Reduce motor load
Oht4.P Power module rectifier over temperature
Check for supply imbalance
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
3 Check feedback device mechanical coupling
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)
OIAC.P Power module over current detected from the module output currents
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
104 Check feedback device mechanical coupling
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)
OI.br Braking transistor over-current detected: short circuit protection for the braking transistor activated
Check braking resistor wiring
4 Check braking resistor value is greater than or equal to the minimum resistance value
Check braking resistor insulation
OIbr.P Power module braking IGBT over current
Check braking resistor wiring
103 Check braking resistor value is greater than or equal to the minimum resistance value
Check braking resistor insulation
OIdC.P Power module over current detected from IGBT on state voltage monitoring
Vce IGBT protection activated.
109
Check motor and cable insulation.
O.Ld1 Digital output overload: total current drawn from 24V supply and digital outputs exceeds 200mA
26 Check total load on digital outputs (terminals 24,25,26)and +24V rail (terminal 22)
O.SPd Motor speed has exceeded the over speed threshold
Increase the over speed trip threshold in Pr 3.08 (closed loop modes only)
7 Speed has exceeded 1.2 x Pr 1.06 or Pr 1.07 (open loop mode)
Reduce the speed loop P gain (Pr 3.10) to reduce the speed overshoot (closed loop modes only)
168
Parameter Parameter Advanced parameter
x.00 description format descriptions
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Serial comms
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protocol
Diagnosis
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Performance
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Unidrive SP Advanced User Guide
Issue Number: 7