Introduction Parameter x.00
Parameter
description format
Keypad and
display
CT Modbus
RTU
User
programming
CT Soft Menu 0
Advanced parameter
descriptions
Menu 1
Commander SK Advanced User Guide 29
Issue Number: 2 www.controltechniques.com
Three skip references are available to prevent continuous operation at a speed that would cause mechanical resonance. When a skip reference
parameter is set to 0 that filter is disabled. The skip reference band parameters define the frequency or speed range either side of the programmed
skip reference, over which references are rejected. The actual reject band is therefore twice that programmed in these parameters, the skip reference
parameters defining the centre of the band. When the selected reference is within a band the lower limit of the band is passed through to the ramps
such that reference is always less than demanded.
This parameter indicates that the selected reference is within one of the skip frequency regions such that the motor speed is not as demanded.
These parameters are made available for control by analog inputs which are required to be frequency references.
The programmed input is automatically scaled such that 100.0% input corresponds to the set maximum speed (Pr 1.06 or Pr 21.01). Also the 0%
input level corresponds to the minimum speed level (Pr 1.07 or Pr 21.02) if bipolar (Pr 1.10) is not selected.
See Pr 1.09.
1.30 Skip reference band 1
1.32 Skip reference band 2
1.34 Skip reference band 3
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range 0.0 to 25.0Hz
Default 0.5
Update rate Background
1.35 Reference in rejection zone
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Update rate 5ms
1.36 Analog reference 1
1.37 Analog reference 2
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111 1
Range ±1500.0Hz
Update rate 5ms
1.38 Percentage trim
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1
Range ±100.0%
Default 0.0
Update rate 5ms
1.39 to 1.40 Unused parameters
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