Rockwell Automation 1784-KTXD User Manual Page 75

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Publication 1747-UM011F-EN-P - May 2007
System Installation Recommendations 75
Periodic Tests of Master Control Relay Circuit
Any part can fail, including the switches in a master control relay
circuit. The failure of one of these switches would most likely cause
an open circuit, which would be a safe power-off failure. However, if
one of these switches shorts out, it no longer provides any safety
protection. These switches should be tested periodically to assure they
will stop machine motion when needed.
Preventive Maintenance
The printed circuit boards of the controller must be protected from
dirt, oil, moisture and other airborne contaminants. To protect these
boards, the controller must be installed in an enclosure suitable for
the environment. The interior of the enclosure should be kept clean
and the enclosure door should be kept closed whenever possible.
Regularly inspect your terminal connections for tightness. Loose
connections may cause improper functioning of the controller or
damage the components of the system.
The National Fire Protection Association (NFPA) provides
recommendations for electrical equipment maintenance. Refer to
article 70B of the NFPA for general requirements regarding safety
related work practices.
ATTENTION
To ensure personal safety and to guard against damaging
equipment, inspect connections with incoming power off.
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