Parker AC30 - Slew Rate

Parameter Reference D-157
AC30 series Variable Speed Drive
Slew Rate
Parameters::Motor Control::Slew Rate
Designed for VOLTS/Hz motor Control Mode.
This function prevents over-current and over-voltage faults occurring due to a rapidly changing setpoint.
Parameter Name
No.
Path
Default
Range
Units
Writable
Slew Rate Enable
0360
Parameters::Motor Control::Slew Rate
TRUE
ALWAYS
Enable/Disable slew rate limit
Slew Rate Accel Limit
0361
Parameters::Motor Control::Slew Rate
500
1 to 1200
Hz/s
ALWAYS
Maximum rate at which the setpoint can be changed away from zero
Slew Rate Decel Limit
0362
Parameters::Motor Control::Slew Rate
500
1 to 1200
Hz/s
ALWAYS
Maximum rate at which the setpoint can be changed towards zero
Functional Description
The Slew Rate limit obtains the setpoint from the output of the application, correctly scaled by the Reference feature and already processed by the
Power Loss Ride Thru and the Ramp Hold features ( if enabled ). The rate of change limits are applied and the setpoint is then passed on for further
processing.
When the braking feature determines that the internal dc link voltage is too high it issues a Hold signal. This causes the Slew Rate limit function to
hold the setpoint at its current value. This typically lasts for only 1ms, time for the excess energy to be dumped into the dynamic braking resistor.