Menu 3
60
Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
Pr
3.33
and Pr
3.44
are used to scale the pulse counter down to the required position units. The multiplying factor applied to the counter is defined as:
The table below shows how the resolution decreases as the maximum reference frequency decreases:
Example:
With Pr
3.43
set to 10kHz and the destination parameter (Pr
8.25
) set to preset speed 1 (Pr
1.21
).
When the input frequency on terminal B7 is 10kHz, preset speed 1 will be 50Hz (Pr
1.06
= 50Hz, Eur defaults). This will have a resolution of 11 bits.
Frequency input with High Resolution
When Pr
8.35
is set to 3 (Frequency input with high resolution) this gives a 12 bit input for maximum reference frequencies of 12kHz and greater.
Pr
1.19
is automatically updated with the 2 LSBs.
Example:
With a maximum reference frequency of 12kHz, the resolution is 12 bits.
With a maximum reference frequency of 2kHz, the resolution is 9 bits.
Scale factor applied to the frequency reference.
Indicates the percentage of the frequency input value, up to the maximum reference frequency (Pr
3.43
).
3.34
Position scaling denominator
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
0.0 to 100.0
Default
1.0
Update rate
Background
3.35 to 3.42
Unused parameters
3.43
Maximum reference frequency
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
0.0 to 50.0 kHz
Default
10.0
Update rate
Background
Maximum reference frequency
Resolution
6kHz – 50kHz
11 bits
3kHz – 6kHz
10 bits
1.5kHz – 3kHz
9 bits
750Hz – 1.5kHz
8 bits
375Hz – 750Hz
7 bits
3.44
Frequency reference scaling
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
3
1
1
1
Range
0.000 to 4.000
Default
1.000
Update rate
Background
3.45
Frequency reference
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
1
Range
0.0 to 100.0%
Update rate
5 ms
Pr3.33
Pr3.34
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