Chapter 9 - Troubleshooting
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MNL000303.doc
Revision 2
09/16/2016
SourceSystem TE11
© Versum Materials, Inc. as of the revision and date shown. All rights reserved.
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9.7 Troubleshooting Procedures
This section assumes that all devices are calibrated and functioning according to the
manufacturer's specification. Contact your Versum Materials, Inc. Technical Representative
or the manufacturer should you need to obtain this information.
Before performing troubleshooting, review the Safety
section and read the warnings at the beginning of this
chapter. If at any time during troubleshooting, you are
unsure what to do next, DO NOT CONTINUE, contact
Versum Materials, Inc..
9.7.1
Troubleshooting Analog Inputs
9.7.1.1
Blown fuse
1. The analog input circuits are grouped 4 to a fuse. Determine which fuse is blown by
identifying the four analog inputs that are faulted.
2. Turn off power to the system.
3. Remove the blown fuse from the fuse holder and use an ohm meter to verify that the
fuse is bad.
4. Check each of the associated analog circuits for a short circuit by performing an ohm
test between points JAIx-1 and JAIx-3 (x = analog input number).
a. If a short circuit is detected then disconnect the associated field device from the
interface box and perform the ohm test again. If the short circuit goes away then
field device is probably defective. Replace the field device. Continue to next step.
b. If the short circuit remains after the field device is disconnected then the fault
exists in the cables, connectors, or other internal circuitry of the controller.
Replace the cables, or connectors, one at a time, as necessary until the short circuit
is eliminated. Continue to next step.
5. Replace the blown fuse with a new fuse.
6. Re-establish power to the system.
a. If the fuse blows again then more advanced troubleshooting skills may be
required to isolate the fault.