Chapter 5 Diagnostics And Troubleshooting; Section 5.1 Safety Considerations; Indicator Lights; Stand Clear Of Equipment - Spectrum Controls 1769 User Manual

Section 5.1
Safety
Considerations
User's Manual Pub. 0300241-01 Rev. A
Chapter 5
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
Attention
before checking electrical connections or inputs/outputs causing
machine motion.

5.1.1 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.

5.1.2 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.

5.1.3 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.

5.1.4 Safety Circuits