PMDX-132 User’s Manual
PCB Revision: PCB-466A
Document Revision: 1.0
Serial Numbers: 23410 and above
PMDX-132_Manual_10.doc
©2008 Practical Micro Design, Inc.
Page 23 of 24
17 April 2008
All Rights Reserved
7.0 Electrical and Environmental Specifications
AC Power:
120/240 VAC, 0.25 amps.
Motor Power:
The voltage connected to the motor power input must be in conformance
with the Gecko stepper motor driver specifications. Do not exceed 80
volts DC at the motor power input to the PMDX-132 board.
The power to each driver is fused and equipped with a 470 uF, 100 volt
power filtering capacitor (as recommended by Geckodrive).
The PMDX-132 comes equipped with 5 ampere fast blow fuses. You may
replace them with fuses for less current, but do not increase above 5
amperes even when setting the Gecko stepper drivers for motor currents
above 5 amperes. The Gecko stepper drivers will draw less than 5
amperes even when providing more than 5 amperes to the motors. These
fuses are 5mm x 20mm fuses rated for 125 volts minimum.
Status Inputs:
Min. input “high”:
2.0V (referenced to the “Gnd” terminal)
Max. input “low”:
0.8V (referenced to the “Gnd” terminal)
Control Outputs:
Min. output “high”:
3.8V (referenced to the “Gnd” terminal,
sourcing up to 6 mA per output)
Max. output “low”:
0.4V (referenced to the “Gnd” terminal,
sinking up to 6 mA per output)
Step & Direction Outputs:
Designed to drive the Gecko driver’s optically isolated
inputs, able to source and sink up to 16mA per signal.
Charge Pump:
Min. Frequency:
100 Hz minimum square wave on pin 17.
Relay Contact Ratings:
10 amperes at 24 VDC,
10 amperes at 120 VAC,
10 amperes at 240 VAC
Environmental:
Temperature:
0° to +55° C
Relative Humidity:
20% to 80% relative humidity, non-condensing
