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SINUS/ISD 15P0082B8
USER MANUAL
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6.4.1.37 SLEW RATE LIMIT
This function block prevents over-
current and over-voltage faults
occurring due to a rapidly changing
setpoint.
Functional Description
The slew rate limits block obtains the setpoint from the output of the application, correctly scaled by the setpoint
scale block. The rate of change limits are then applied and the setpoint is then passed on for future processing
by the current limit block.
When the braking block determines that the internal dc link voltage is too high it issues a Hold signal. This
causes the slew rate limits 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.
MMI Menu Map
1
SETUP PARAMETERS
2
FUNCTION BLOCKS
3
MOTOR CONTROL
4
SLEW RATE LIMIT
SLEW ENABLE
SLEW ACCEL LIMIT
SLEW DECEL LIMIT
SLEW RATE LIMIT SLEW RATE LIMIT
TRUE – [ 60] ENABLE ––
500.0 Hz/s –– [ 62] ACCEL LIMIT ––
500.0 Hz/s –– [ 61] DECEL LIMIT ––
Parameter Descriptions Parameter Descriptions
ENABLE 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
ACCEL LIMIT Range: 12.0 to 1200.0 Hz/s
The maximum rate at which the setpoint may accelerate away from zero.
DECEL LIMIT
DECEL LIMIT Range: 12.0 to 1200.0 Hz/s
The maximum rate at which the setpoint may decelerate towards zero.
SETPOINT
DECEL LIMIT
ACCEL LIMIT
HOLD SIGNAL