Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 122)

Publication 1747-UM011G-EN-P - June 2008
122 Starting Up Your Control System
• United States: refer to NFPA 70E, Electrical Safety Requirements for
Employee Workplaces.
1. Inspect Your Installation You can often prevent serious problems in later test procedures by
first making a thorough physical inspection. We recommend that you
perform the following procedure.
1. Make sure that the controller and all other devices in the system
are securely mounted.
2. Check all wiring including:
• connections from the main disconnect to the controller input.
• the master control relay/emergency-stop circuit.
• input device circuits.
• output device circuits.
Make certain that all wiring connections are correct and that
there are no missing wires. Check the tightness of all terminals
to make certain wires are secure.
3. Measure the incoming line voltage. Be certain that it
corresponds to controller requirements and that it falls within
the specified voltage range. See specifications for input voltage
ranges on page 176.
2. Disconnect
Motion-Causing Device In the following test procedures, the controller is energized. As a
safety precaution, you must make certain that machine motion does
not occur. The preferred way is to disconnect the motor wires at the
motor starter or the motor itself. In this way, you can test the
operation of the starter coil, verifying that your output circuit is wired
correctly and functioning. Similarly, the preferred way to disconnect a
solenoid is to disengage the valve, leaving the coil connected.
In some instances, you may not be able to disconnect a device the
preferred way. In this case, it is necessary to open the output circuit at
some convenient point.
For circuit testing purposes, it is best to open the circuit at a point as
close as possible to the motion-causing device. For example, your
output might be a relay coil that in turn energizes a motor starter; if it
is impractical to disconnect the motor wires, the next best thing to do