Srt-422 – INFICON SRT-422 Crucible Indexer User Manual
Page 39
Installation
Page 37
Section 3.6: configuring the opto-isolator pc board for 24-vdc I/Os
The control unit’s opto-isolated I/Os are factory configured to operate on 9 V dc supplied by an
internal power supply. However, the control unit’s opto-isolator board can also be configured to
operate on +24 V dc supplied by an external source. Follow the steps described below to
accomplish this reconfiguration.
STEP NO.
PROCEDURE
1
Make sure the power cord is not connected to the control unit.
2
Remove the four screws that secure the control unit’s rear panel (see Figure
Below).
240VAC Fuse 1/8 AMP SB
120VAC Fuse 1/4 AMP SB
I/O (ISOLATED)
RS-232
MOTOR
Ready
SRT-422
instruments
Remove these Screws to detach
rear panel from body.
Figure 3.7: Locations of screws that secure the control unit’s rear panel to its body
3
Grasp the rear panel and pull it backwards until it is approximately an inch away
from the body of the controller.
4
The jumper blocks to be reconfigured are mounted on the underside of the opto-
isolator PC board, which is the topmost board in the unit. Turn the control unit
upside down and find the legend JP1 on the underside of this board. You will find
this legend near the rear of the board and along the edge of the board that is
closest to the rear-panel connector labeled I/O (ISOLATED). Jumper block JPI is
just behind the legend JP1 (or just to the right of this legend, if you are looking at it
from the side of the controller).
5
The pins on jumper block JPI are numbered from left to right as you face the side of
the controller that the jumper block is on. From that point of view, pin 1 is on your
left, pin 2 is in the middle, and pin 3 is on your right. The jumper across this jumper
block is factory installed so that it covers pins 1 and 2, leaving pin 3 exposed.
Remove the jumper and replace it so that it covers pins 2 and 3, leaving pin 1
exposed.
7
JP2 is behind and at right angles to JP1 (i.e., behind JP1 with respect to the
controller’s front panel). On this jumper block, pin 1 is the pin nearest the edge of
the board; pin 2 is in the center, and pin 3 is nearest to the center of the board. Like