A8 – SDM-44140 (-D4140)
Description
The SDM-44140 resides inside the DMC-40x0 enclosure and contains four microstepping drives for operating two-
phase bipolar stepper motors. The drives produce 64 microsteps per full step or 256 steps per full cycle which
results in 12,800 steps/rev for a standard 200-step motor. The maximum step rate generated by the controller is
6,000,000 microsteps/second. The SDM-44140 drives motors operating at up to 3 Amps at 20 to 60 VDC (available
voltage at motor is 10% less).There are four software selectable current settings: 0.5 A, 1 A, 2 A and 3 A. Plus, a
selectable lowcurrent mode reduces the current by 75% when the motor is not in motion. No external heatsink is
required.
Note: Do not “hot swap” the motor power or supply voltage power input connections. If the amp is enabled when
the motor connector is connected or disconnected, damage to the amplifier can occur. Galil recommends
powering the controller and amplifier down before changing the connector, and breaking the AC side of the power
supply connection in order to power down the amplifier. The ELO input may be used to cut power to the motors in
an Emergency Stop or Abort situation.
Figure A7.1: DMC-4040-C012-I000-D4140 (DMC-4040 with SDM-44140)
A8 – SDM-44140 (-D4140) ▫ 251 DMC-40x0 User Manual
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