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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9.7.3
Troubleshooting Digital Outputs
9.7.3.1
Blown fuse
1. Determine which fuse has blown and remove it.
2. The digital output circuits are grouped 16 to a fuse. Determine which digital output
circuits are associated with the blown fuse. Disconnect all associated devices (unplug
the solenoid connector, and unplug any other connections at the interface box).
3. From the HMI display, manually close all valves associated with the blown fuse.
4. Replace the blown fuse with a new one.
a. If the fuse blows immediately then the short circuit is somewhere within the
PLC I/O, interface board, or cables. Replace the associated components, one at
a time, as necessary until the short circuit is eliminated. Continue to next step.
5. Turn off instrument air to the solenoids to prevent opening process valves during
troubleshooting.
6. Test each valve output by cycling the valve on and off from the HMI display. Verify
that the LED on the PLC output card turns on.
a. If the fuse blows at any time during this test then the short circuit is somewhere
within the PLC I/O, interface board, or cables. Replace the associated
components, one at a time, as necessary until the short circuit is eliminated.
Continue to next step.
7. Reconnect the solenoid connector and cycle each of the valves from the HMI display
again. Also, reconnect any other devices and power those outputs as well.
a. If the fuse blows when any of the devices is tested then that may be the faulty
device. Replace as necessary. Continue to next step.
8. Replace the blown fuse with a new fuse.
9. Turn instrument air back on.