15
Electrical
Input Power: 95 to 130 VAC 50/60 Hz, 190 to 270 VAC 50/60, switch selectable.
Fuse: 3.5 Amp (located on PC board by voltage select switch).
Output Power: 0 to 2.5 Amps at 40 VDC through an H bridge liner driver. 0-3.5 amps for 3.5 amp version at
20V DC
Motor Compatibility
Motor inductance - approximately 4 mH for a PMC supplied motor. The drive has a minimum inductance of
1mH. However a motor inductance greater than 20 mH will reduce the top motor speed and may cause
stability problems.
Indexer Inputs/output
All input signal are optically isolated and have a current limiting resistor in series. A driving source of 5 volts
will meet this requirement. If a higher voltage source is used a corresponding external resistor must be
added
Fault (error+, error-) is an npn transistor photo-coupled rated at 50V maximum output. The typical current
when on is 1ma. The transistor is on when an over-current, over-temperature or under-voltage- condition is
detected.
The inputs and fault output can be programmed for a different function for OEM customers. Consult the
factory if you have a need for this option.
PMC drives come pre tested and adjusted for the motor that is supplied with the unit. No further adjustments
are necessary.
"DO Not" connect or disconnect the motor with power applied to the box.
Resonances
All stepper motor drives are subject to two oscillation regions; low speed (approximately 1 rev/sec) and mid-
range (approximately 10 to 15 rev/sec).
Microstepping minimizes low speed oscillation. If your load has a high Q and resonates around 200 Hz,
adding extra inertia to the motor shaft may eliminate the problem. Changing the current wave shape may
help tune the motor driver to your motor load combination.
PMC motors and drives have been matched to eliminate most mid-range instability problems.
