Specifications

Appendix F

Plug-In Modules

Introduction

ST-133 and ST-133A Controllers have three plug-in slots. The Analog/Control module

(leftmost slot when the controller is viewed from the rear) and the Interface Control

module (middle slot) are always provided. The third slot, however, is always covered

with a blank panel unless a PTG module has been installed in an ST-133A Controller.

If a module is ever removed for any reason, internal settings should not be disturbed.

Changing a setting could radically alter the controller’s performance. Restoring normal

operation again without proper equipment and guidance would be very difficult, and it

might be necessary to return the unit to the factory for recalibration.

Modules should never be removed or installed when the controller is under power. If a

module is removed or installed when the controller is powered, permanent equipment

damage could occur which would not be covered by the warranty.

Removing/Installing a Module

To remove a module, rotate the two locking screws (one at the top of the module and one

at the bottom) counterclockwise until they release from the chassis. Then grasp the

module and pull it straight out.

Installing a module is a bit more complex because you first have to be sure the locking

screws are aligned correctly. The following procedure is suggested.

1. Rotate the two locking screws counterclockwise until the threads on the screws

engage those of the module panel. See Figure 40. By doing this, the screws will be

perfectly perpendicular to the module panel and will align perfectly when the module

is inserted.

2. Insert the module so that the top and bottom edges of the board are riding in the

proper guides.

3. Gently but firmly push the module in until the 64-pin DIN connector at the back of

the module mates with the corresponding connector on the backplane, leaving the

module panel resting against the controller back panel.

4. Rotate the two locking screws clockwise. As the screws are rotated, they will first

disengage from the module panel threads, and then begin to engage those of the

bracket behind the controller panel.

WARNING