RM42A Digital Stepper Drive User Manual
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Figure 6 Fault Connection
5. Motor Connection
The RM42A can drive 2-phase and 4-pahse bipolar hybrid stepper motors.
The 4 lead motors are the least flexible and easy to connect. The output current from drive that is multiply the specified
phase current by 1.4 to determine the peak output current.
Figure 7 4-lead Motor Connections
6. Power Supply Selection
The RM42A can power medium and large size stepping motors (frame size from NEMA 11 to 24). To get good driving
performances, it is important to select supply voltage and output current properly. Generally speaking, supply voltage
determines the high speed performance of the motor, while output current determines the output torque of the driven
motor (particularly at lower speed). Higher supply voltage will allow higher motor speed to be achieved, at the price of
more noise and heating. If the motion speed requirement is low, it’s better to use lower supply voltage to decrease noise,
heating and improve reliability.
6.1Power Supply Sharing
Multiple RM42A drives can share one power supply to reduce cost, if that power supply has enough power capacity. To
avoid cross interference, connect each stepper drive directly to the shared power supply separately. To avoid cross
interference, DO NOT daisy-chain connect the power supply input pins of the Drivers. Instead connect them to power
supply separately.
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