Control Techniques Digitax ST Advanced User's Manual page 130

Parameter
Menu 10
structure
Trip
HF29 Control board thermistor fault
229 Hardware fault - return drive to supplier
HF30 DCCT wire break trip from power module
230 Hardware fault - return drive to supplier
It.AC
Output current overload timed out (I
Ensure the load is not jammed / sticking
Ensure that the motor rated current is not set to zero
Check the load on the motor has not changed If seen during an autotune, ensure that the motor rated current Pr 0.46 (Pr 5.07) or
20 Pr 21.07 is current rating of the drive
Tune the rated speed parameter
Check feedback device signal for noise
Check the feedback device mechanical coupling
It.br
Braking resistor overload timed out (I
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
19
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
O.CtL Drive control board over temperature
Check enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
23 Check enclosure door filters
Check ambient temperature
Reduce drive switching frequency
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 enclosure / drive fans are still functioning correctly
Check enclosure ventilation paths
Check enclosure door filters
Increase ventilation
22
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 DC bus ripple
27 Decrease acceleration / deceleration rates
Reduce duty cycle
Reduce motor load
OI.AC Instantaneous output over current detected
Over current threshold is Kc / 0.45 (see Table 4-2 Maximum motor rated current on page 17 for Kc values)
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
Reduce the values in speed loop gain parameters – Pr 3.10, Pr 3.11 and Pr 3.12
Has offset measurement test been completed?
Reduce the values in current loop gain parameters - Pr 4.13 and Pr 4.14
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
130
Keypad and
Parameter x.00
display description format
2
t) - accumulator value can be seen in Pr 4.19
2
t) – accumulator value can be seen in Pr 10.39
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Digitax ST Advanced User Guide
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