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48 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 7
The frequency slaving output is in the form of F and D or quadrature A/B signals (Pr 3.18 = 0 gives quadrature, Pr 3.18 = 1 gives F and D). When F
and D is used the output frequency is either 1 or 2048 times the drive fundamental output frequency (selected by Pr 3.17). When quadrature A/B
signals are used, the slaving output frequency is effectively divided by 2 giving either 0.5 or 1024 times the drive fundamental output frequency. When
the drive output frequency changes direction there is always a period of 250µs where no pulses are produced. This ensures that with an F and D
output there is a set-up time of 250µs for the direction signal before an edge occurs on the frequency signal. The frequency slaving output operates
up to 1000Hz, above this frequency the outputs could be undefined.
For further Menu 3 Open-loop parameters, refer to Pr 3.27 on page 61.
3.17 Select x2048 output
Drive modes Open-loop
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default Open-loop 1
Update rate Background read
3.18 F and D frequency slaving output
Drive modes Open-loop
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default Open-loop 0
Update rate Background read
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