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Programming Your Application
690+ Series Frequency Inverter
SLEW RATE LIMIT
Designed for all Motor Control Modes.
This function block prevents over-current
and over-voltage faults occurring due to a
rapidly changing setpoint.
Functional Description
The SLEW RATE LIMIT block obtains the setpoint from the output of the application, correctly
scaled by the SETPOINT SCALE block. The rate of change limits are applied and the setpoint
is then passed on for further processing.
When the braking block determines that the internal dc link voltage is too high it issues a Hold
signal. This causes the SLEW RATE LIMIT block to hold the setpoint at its current value. This
typically lasts for only 1ms, time for the excess energy to be dumped into the braking resistor.
SETPOINT
DECEL LIMIT
ACCEL LIMIT
HOLD SIGNAL
Note:
If the drive is part of a common DC link/bus system set the ENABLE parameter to FALSE.
This disables ramp-hold during deceleration on high link volts feature.
Slew Rate Limit
TRUE – [ 60] ENABLE
–
500.0 Hz/s
–
[ 62] ACCEL LIMIT
–
500.0 Hz/s
–
[ 61] DECEL LIMIT
–
MMI Menu Map
1
SETUP
2
MOTOR CONTROL
3
SLEW RATE LIMIT
ENABLE
ACCEL
LIMIT
DECEL
LIMIT
Parameter Descriptions
ENABLE
Range: FALSE / TRUE
When this parameter is FALSE, this function block is disabled and the setpoint is unaffected by
this function block.
ACCEL LIMIT
Range: 1.0 to 1200.0 Hz/s
The maximum rate at which the setpoint may accelerate away from zero.
DECEL LIMIT
Range: 1.0 to 1200.0 Hz/s
The maximum rate at which the setpoint may decelerate towards zero.