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VACON® 3000
Application Guide
This input mode requires that both channels A and B are receiving pulses, differential connection is recommended.
Closed Loop speed control can only be used with this encoder mode.
A
B
C
D
Illustration 50: Counter Function in Quadrature Mode
A
Input A signal
B
Input B signal
Directional Pulse Mode
In this mode, both channels are receiving signals but not at the same time.
Directional Pulse encoding provides pulses on input A when rotational direction is forward. Position Counter counting direction is
incrementing.
Pulses on input B indicate reverse rotational direction. Position Counter counting direction is decrementing.
The 16-bit Position Counter is incremented after each edge of input A. The counter is decremented after each edge of input B.
This mode cannot be used for closed loop control.
A
B
C
D
Illustration 51: Counter Function in Directional Pulse Mode
A
Input A signal
B
Input B signal
Pulse + Direction Mode
In this mode, only channel A is receiving pulses. Channel B determines if the direction is negative or positive. The input in channel B
must be a static signal.
For Pulse + Direction encoding, the 16-bit Position Counter is incremented or decremented after each edge of input A.
Direction is indicated on input B: Logic high indicates forward rotational direction. Position Counter counting direction is incre-
menting.
When input B is logic low, reverse rotational direction is indicated and results in counter decrementing.
This mode cannot be used for closed loop control.
Danfoss A/S © 2021.09
C
Counter
D
Direction
C
Counter
D
Direction
AB319735759636en-000101 / DPD01822 | 229
Parameter descriptions
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