Encoder Shaft Position; Encoder Outputs (Terminals 49, 50, 52, 53); Z Marker-Pulse Outputs (Terminals 54, 55) - Control Techniques UD51 User Manual

5.4

Encoder shaft position

The UD51 monitors the change in position of the encoder shaft by detecting
the states of the quadrature A and B signals. Zero position is detected from
the appropriate edge of the Z marker pulse, as follows:
Direction
Forward
Reverse
5.5

Encoder outputs (terminals 49, 50, 52, 53)

The signal source and signal mode of these outputs can be selected as
follows:
5.5.1 Signal source
Main or second encoder (see Pr 16.06 Encoder 1 select)
5.5.2 Signal mode
Quadrature AB signals or frequency and direction signals (see Pr 16.08 F/D
output enable)
5.5.3 Scaling
To change the number of pulses per revolution for the output signals, see Pr
16.07 Encoder output scaling.
5.6

Z marker-pulse outputs (terminals 54, 55)

The simulated-encoder Z marker-pulse outputs are a buffered version of the
Z marker-pulse inputs from the main encoder (Encoder 1) or the second
encoder input.
The Z marker-pulse outputs are by default synchronized to the quadrant
where the quadrature A and B signals are both low. When synchronization is
disabled, the Z marker pulse can be present in any of the four quadrants, as
follows:
A and B both low
A and B both high
A low and B high
A high and B low
5.6.1 Simulated Encoder Output - Marker
Whilst using a UD51, it is possible to synchronise the simulated encoder
output quadrature signals to the marker output pulse. In order for the
simulated encoder output to be synchronised the following hardware and
software must be used
• A Unidrive with Software V03.01.07 or later
• An Issue 4 - UD51, 2
14
Edge of the Z marker pulse
nd
Encoder Small Option Module
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Rising
Falling
UD51 User Guide
Issue Number: 5