Chapter 4 Diagnostics And Troubleshooting; Safety Considerations; Indicator Lights; Stand Clear Of Equipment - Spectrum Controls 1769 User Manual

Safety
Considerations
WARNING
Chapter 4
Diagnostics and
Troubleshooting
This chapter describes troubleshooting the isolated RTD/Resistance input
module. This chapter contains information on:
Safety considerations while troubleshooting
•
• Internal diagnostics during module operation
• Module errors
Safety considerations are an important element of proper troubleshooting
procedures. Actively thinking about the safety of yourself and others, as well as
the condition of your equipment, is of primary importance.
The following sections describe several safety concerns you should be aware of
when troubleshooting your control system.
Never reach into a machine to actuate a switch because unexpected motion
can occur and cause injury.
Remove all electrical power at the main power disconnect switches before
checking electrical connections or inputs/outputs causing machine motion.

4.1.1 Indicator Lights

When the green LED on the module is illuminated, it indicates that power is
applied to the module and that it has passed its internal tests.

4.1.2 Stand Clear of Equipment

When troubleshooting any system problem, have all personnel remain clear of
the equipment. The problem could be intermittent, and sudden unexpected
machine motion could occur. Have someone ready to operate an emergency stop
switch in case it becomes necessary to shut off power.

4.1.3 Program Alteration

There are several possible causes of alteration to the user program, including
extreme environmental conditions, Electromagnetic Interference (EMI), improper
grounding, improper wiring connections, and unauthorized tampering. If you
suspect a program has been altered, check it against a previously saved master
program.
User's Manual Pub. 0300241-02 Rev. A