Watlow CAS - Manual (Page 77)

Troubleshooting
CAS User’s Guide 67
Troubleshooting
The next few sections describe general troubleshooting for the CAS.
Later sections describe specific procedures, like checking an input,
changing the EPROM, and testing the device.
First, Check your Installation
Please bear in mind that, even in stand-alone systems, the CAS is only
part of your system. Often, what appears to be a problem with the CAS
is really a problem with other equipment- so check these things first:
• Scanner is installed correctly. (See Chapter 2: Installation for help.)
• Inputs, like thermocouples, are installed correctly and
are working.
Second, Replace Unit
If you are certain that the scanner is installed correctly, you can try
replacing the CAS with a spare CAS. If the spare unit works correctly,
then the problem is specific to the CAS you replaced.
WARNING
If the scanner wasn't installed correctly ; for instance, if you
have shorted sensor inputs to high voltage lines or a trans-
former is shorted out, and you replace the CAS with a spare
unit, the spare unit will break, and you'll need to send both
units to Watlow Anafaze for repair. Therefore, make sure you
have checked the installation before replacing the unit.
If you need to update the CAS Erasable Programmable Read-Only
Memory (EPROM), please refer to the third section, Changing the
EPROM.