PSR8078 User Manual
REV1.0 3
Note:
1. Driver’s reliable working temperature should be less than 70°C (158°F), and motor
working temperature should be less than 80°C (176°F);
2. It is recommended to use automatic idle-current mode, namely current automatically
reduce to 50% when motor stops, so as to reduce driver heating and motor heating;
3. It is recommended to mount the driver vertically to maximize heat sink area. Use forced
cooling method to cool the system if necessary.
3. Pin Assignment and Description
The stepper drive PSR8078 has two connectors, connector P1 for control signals connection,
and connector P2 for power and motor connection. The following tables are brief description
of the two connectors of the stepper drive PSR8078. More detailed description of the pins
and related items are presented in section 4, 5, 9.
3.1 Connector P1 Configuration
Pin Function
Details
PUL+
Pulse signal: This input represents pulse signal, effective for each rising
edge; 4-5V when PUL-HIGH, 0-0.5V when PUL-LOW. For reliable
response, pulse width should be longer than 1.5μs. Series connect
resistors for current-limiting when +12V or +24V used (The same as DIR
and ENA signals).
PUL-
DIR+
Direction signal: HIGH/LOW level signal, correlative to motor rotation
direction. For reliable response, DIR must be ahead of PUL by 5μs at
least. 4-5V when DIR- HIGH, 0-0.5V when DIR-LOW. Motor rotation
direction also depends upon the connection of the motor windings,
exchange any motor phase can reverse motor rotation direction.
DIR-
ENA+
Enable signal: This signal is used for enabling/disabling drive. High level
for enabling drive and low level for disabling drive. Usually left
unconnected (enabled).
ENA-
3.2 Connector P2 Configuration
Pin Function
Details
GND
DC power ground
+V
DC power supply, 24~80VDC, Including voltage fluctuation and EMF
voltage.
A+, A-
Motor Phase A
B+, B-
Motor Phase B
PSR8078 User Manual
REV1.0 4
4. Control Signal Connector (P1) Interface
The stepper drive PSR8078 can accept differential and single-ended inputs (including
open-collector and PNP output). The stepper drive PSR8078 has 3 optically isolated logic
inputs which are located on connector P1 to accept line driver control signals. These inputs
are isolated to minimize or eliminate electrical noises coupled onto the drive control signals.
Recommend use line driver control signals to increase noise immunity of the driver in
interference environments. In the following figures, connections to open-collector and PNP
signals are illustrated.
Figure 2: Connections to open-collector signal (common-anode)
Figure 3: Connections to PNP signal (common-cathode)
