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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 14 of 24
17 April 2008
All Rights Reserved
Connector
Description
J1
DC power supply input for stepper drivers
J2
AC power for logic supply
J3 & J4
Relay contact connections
J5
Fan power output and daisy-chain signal
J6
Centronics 36-pin PC Parallel Port
J7
26-pin ribbon header (alternate connection to PC parallel port)
J8
Status input connections
J9
Control output connections
J10
Fault, E-Stop and Motor Disable connections
J11, J14, J17 &
J20
Current set resistor connections for four Gecko stepper drivers
J12 & J13
Connections to Gecko stepper driver #4 (on the bottom of the board)
J15 & J16
Connections to Gecko stepper driver #3 (on the bottom of the board)
J18 & J19
Connections to Gecko stepper driver #2 (on the bottom of the board)
J21 & J22
Connections to Gecko stepper driver #1 (on the bottom of the board)
J23
PMDX Expansion Connector
Table 2 - Summary of PMDX-132 Connectors
4.1
DC (Motor) Power Supply (J1)
J1 is a two-position wire clamp screw terminal for the DC power supply input. This power input is used
solely as the motor power for the Gecko stepper driver modules. An LED (DS11) next to the connector
lights to indicate the presence of DC power.
Pin Number
Label
Description
1
POS
Positive DC input terminal
2
NEG
Negative DC input terminal (does
not
have to be the same
as the PC’s ground reference)
Table 3 – DC Power Connector Pin-Out (J1)
WARNING:
The voltage connected to the motor power input must conform with the
Gecko stepper 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 if the Gecko stepper drivers are set for currents
above 5 amperes. The Gecko stepper drivers will draw less than 5 amperes even when providing 7
amperes to the motors. These fuses are 5mm x 20mm fuses rated for 125 volts minimum.
4.2
AC Power Supply (J2)
J2 is a 3-position wire clamp screw terminal for AC power input. It allows the use of either 120 VAC or
240 VAC mains voltage. This power supply input provides power to everything
except
the stepper
motor drivers (see section 4.1). An LED next to the connector (DS5) lights to indicate the presence of
reg5V DC derived from this AC power supply. Note that this LED may glow dimly if AC power
is removed and the board is connected to the PC’s parallel port, however, the PMDX-132 will not
function correctly unless AC power is supplied.