Installation manual

14
Epsilon EP-B Base Drive Reference Manual
Figure 16: Pulse/Direction Signals, Differential Inputs
Pulse/Quadrature Interpretation
In Pulse/Quadrature interpretation, a full quadrature encoder signal is used as the command. When B leads A encoder
counts are received they are interpreted as positive changes to the Pulse Position Input. When A leads B encoder counts
are received they are interpreted as negative changes to the Pulse Position Input. All edges of A and B are counted,
therefore one revolution of a 2048 line encoder will produce an 8192 count change on the Pulse Position Input. Any two
consecutive edges must be separated by .2/f max in time for correct interpretation.
Figure 17: Pulse/Quadrature Signals, + Command
Figure 18: Pulse/Quadrature Signals, – Command
Pulse Signal Type
The drive provides two types of pulse input circuits which allows you to choose the appropriate input type to match the
device generating the position pulses. The selection is done by wiring to the desired input pins of the Analog/Sync Output
connector (J5) or the Sync Input connector (J10) and setting the Pulse Signal type selection in the Setup view. The
Differential setting (default) is perfect for most encoders or upstream drives. The Single Ended setting is a good match
for any open collector driver that requires an external pull up resistor or 5 Volt logic driver making it ideal for most stepper
controllers, PLC stepper cards and PC computer parallel printer ports.
The two hardware input circuits are included in the drive and are accessible through the drives Analog/Sync Output
connector or the Sync Input connector. The differential input circuit is RS-485 compatible making it inherently noise
immune while being able to accept pulse rates of up to 1 Mhz per channel. The single ended inputs have internal pull-
up resistors to the drive’s 5 Volt logic supply so external pull-ups and biasing circuitry is not required. When proper
CW
CCW
Direction
Pulse
Motion occurs
on rising edge
B leads A = + Pulse Position Inputs
Channel A
Channel B
A leads B = - Pulse Position Inputs
Channel A
Channel B