Menu 3 Introduction Parameter x.00
Parameter
description format
Keypad and
display
CT Modbus
RTU
User
programming
CT Soft Menu 0
Advanced parameter
descriptions
42 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 2
Frequency input and output
The frequency input is used as a speed reference. In some applications, a frequency input from a controller is used in preference to a 0 to +10V or 4
to 20mA signal.
This frequency input is converted into a frequency reference percentage (Pr 3.45) and this percentage value is used to provide the speed reference
(as Pr 7.01 and Pr 7.02 in Menu 7).
This frequency input cannot be used for frequency slaving.
The frequency input and output are not 'locked' together or synchronised within the drive. The frequency input is used as a speed reference and from
this input, the software calculates the correct frequency to put on to the output.
If the post ramp reference (Pr 2.01) is at or below the level defined by this parameter in either direction the Zero speed flag (Pr 10.03) is 1, otherwise
the flag is 0.
This parameter defines the 'At speed' window which is the boundary around the set speed point in which an 'At speed' indication is given (Pr 10.06 =
1). The 'At speed' window is thus defined as Set speed ±(Pr 3.06 / 2).
The speed detector system also includes an overspeed trip. The level cannot be set by the user, but the drive produces an overspeed trip if the post
ramp reference (Pr 2.01) exceeds 1.2 x (Maximum frequency).
Scale factor applied to the frequency or PWM output.
Defines the maximum frequency required at the frequency output. The choice of maximum output frequency depends on the requirement of the
output. Due to limitations in the hardware, higher output frequencies do not offer the best resolution at the top end of the frequency range.
3.01 to 3.04 Unused parameters
3.05 Zero speed threshold
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0.0 to 20.0 Hz
Default 1.0
Update rate Background read
3.06 At speed window
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0.0 to 20.0 Hz
Default 1.0
Update rate Background read
3.07 to 3.16 Unused parameters
3.17 Frequency output or PWM output scaling
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
3111
Range 0.000 to 4.000
Default 1.000
Update rate Background read
3.18 Maximum output frequency
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0 to 3
Default 2 (5 kHz)
Update rate Background
Pr 3.18 Fmax (kHz) Resolution at Fmax
0 1 10 bit
12 9
25 8
310 7.7
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