Cutler-Hammer D320 PLC, Руководство пользователя

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Chapter 7: Testing and Troubleshooting
179
Output Module
Symptom Expected Cause Troubleshooting
No external input power Supply power.
Low external input voltage Make sure full voltage is being
supplied.
Terminal screw is loose/
Defective contact Tighten screw/
Reconnect module
I/O contact connection Replace the output module.
No outputs on an output
module will turn On.
Defective output circuit Reconnect the output module.
One or more outputs on an I/O
module will not change to On
or Off state. Output circuit error Replace the output module.
Output time too short Correct the program. Output on an I/O module will
not turn Off (LED is not
illuminated).
Defective output circuit Replace the output module.
Incorrect output load Replace the output load.
Loose output wiring Reconnect the output wiring.
Terminal screw is loose/
Defective contact Tighten screw/
Reconnect module
Output contact error Replace the output module of the
relay.
Output on an I/O module will
not turn Off (LED is
illuminated).
Defective output circuit Replace the output module.
Output contact error Replace the output module of the
relay. Output on an I/O module will
not turn On (LED is
illuminated).
Leakage current to low-current load Apply leakage current protection (see
Chapter 4).
Output on an I/O module will
not turn On (LED is not
illuminated). Defective output circuit Replace the output module.
Low external input voltage Make sure full supply voltage is being
input.
Noise error Troubleshoot for noise.
Output changes On/Off state
erratically.
Terminal screw loose/
Defective contact Tighten screw/
Reconnect module
Common terminal screw loose Tighten the screw.
Defective contact/
Terminal connector Reconnect the module.
A set of 8 points on an I/O
module operate incorrectly or
identically.
CPU module error Replace the CPU module.
Output display LED is not on
(output is On to field device). LED error Replace the output module.