Spectrum Controls 140 MPM 204 00sc - Manual (Page 52)

Quantum Series 140 MPM 204 00sc
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Standing Clear of the Equipment Standing Clear of the Equipment Standing Clear of the Equipment Standing Clear of the Equipment Standing Clear of the Equipment
When troubleshooting any system problem, have all personnel remain clear of the equipment. The problem
can be intermittent, and sudden unexpected machine motion can occur. Have someone ready to operate an
emergency stop switch in case it is necessary to shut off power.
Program Alteration Program Alteration Program Alteration Program Alteration 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 that a program has been altered, check it against a previously saved
program on an EEPROM or UVPROM memory module.
Safety Circuits Safety Circuits Safety Circuits Safety Circuits Safety Circuits
Circuits installed on the equipment for safety reasons, such as over-travel limit switches, stop pushbuttons,
and interlocks, should always be hard-wired to the master control relay. These devices must be wired in series
so that, when any one device opens, the master control relay is de-energized, thus removing power to the
equipment. Never alter these circuits to defeat their function. Serious injury or machine damage can result.
Refer to your system’s installation and operation manuals for more information.
Preventive Maintenance Preventive Maintenance Preventive Maintenance Preventive Maintenance Preventive Maintenance
This section describes preventive maintenance procedures to help in maintaining your module.
A A A A ATTENTION TTENTION TTENTION TTENTION TTENTION The National Fire Protection Association (NFPA) recommends maintenance
procedures for electrical equipment. Refer to article 70B of the NFPA for general safety-related work
practices.
Maintaining Printed Circuit Boards Maintaining Printed Circuit Boards Maintaining Printed Circuit Boards Maintaining Printed Circuit Boards Maintaining Printed Circuit Boards
The printed circuit boards of your module must be protected from dirt, oil, moisture, and other airborne
contaminants. To protect these boards, install the PLC system in an enclosure suitable for its operating
environment. Keep the interior of the enclosure clean, and whenever possible, keep the enclosure door closed.
Inspecting T Inspecting T Inspecting T Inspecting T Inspecting Terminal Connections erminal Connections erminal Connections erminal Connections erminal Connections
Regularly inspect the module terminal connections for tightness. Loose connections can cause the module or
PLC system to malfunction, or damage module or system components.
W W W W WARNING ARNING ARNING ARNING ARNING Before inspecting connections, always ensure that incoming power is off.
Failure to observe this precaution can cause personal injury and equipment damage.