Menu 2 Introduction Parameter x.00
Parameter
description format
Keypad and
display
CT Modbus
RTU
User
programming
CT Soft Menu 0
Advanced parameter
descriptions
38 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 2
When parameter Pr 2.20 is set to 0 the deceleration ramp rate selected depends on the state of bit parameters Pr 2.35 to Pr 2.37. These bits are for
control by digital inputs such that ramp rates can be selected by external control. The ramp rate selected depends on the binary code generated by
these bits as follows:
When parameter Pr 2.20 is set to 9 the appropriate deceleration rate is automatically selected depending on the value of parameter Pr 1.50, and so
an deceleration rate can be programmed to operate with each reference. Since the new ramp rate is selected with the new reference, the
deceleration applies towards the selected preset if the motor needs to decelerate to reach the preset.
When switching between preset speeds and using the preset acceleration ramps, the acceleration ramp used is the one associated to the target
preset speed, i.e. if switching from preset speed 3 to preset speed 4 acceleration rate 4 would be used.
If enabling and running to a preset speed using the Run Forward and Run Reverse terminals, the preset acceleration ramp used will be the one
associated to the preset speed being run to.
The jog deceleration rate is only used when the drive is changing speed because the jog reference has changed or to stop from the jog reference. It
is not used to go from the jog to the run state. This prevents the fast ramps normally used with jog from being used when changing between running
and jogging.
There are eight acceleration rates programmable for normal operation, plus one for jogging. The ramp rates are expressed as a time for a change of
100 Hz on the ramp output, therefore with a programmed ramp time of 5 seconds the ramp output will reach 50 Hz from 0 in 2.5 seconds (depending
on the setting of Pr 2.39).
Pr 2.37 Pr 2.36 Pr 2.35 Ramp defined by
000 Pr 2.21
001 Pr 2.22
010 Pr 2.23
011 Pr 2.24
100 Pr 2.25
101 Pr 2.26
110 Pr 2.27
111 Pr 2.28
2.21 Deceleration rate 1
2.22 Deceleration rate 2
2.23 Deceleration rate 3
2.24 Deceleration rate 4
2.25 Deceleration rate 5
2.26 Deceleration rate 6
2.27 Deceleration rate 7
2.28 Deceleration rate 8
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0 to 3200.0 s/100 Hz (or s/10Hz or s/1000Hz if Pr 2.39 = 0 or 2)
Default 10.0
Second motor
parameter
Pr 21.05 for parameter Pr 2.21 only
Update rate 5ms
2.29 Deceleration rate selector
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0 to 3200.0 s/100 Hz (or s/10Hz or s/1000Hz if Pr 2.39 = 0 or 2)
Default 0.2
Update rate 5ms
2.30 Acceleration selected indicator
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111 1
Range 1 to 8
Update rate 5ms
NOTE
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