Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 75)

Chapter 6
Starting Up Your Control System
6–2
You can often prevent serious problems in later test procedures by first
making a thorough physical inspection. We recommend that you do the
following:
1. Make sure that the controller and all other devices in the system are
securely mounted. Refer to chapter 3 and chapter 4 for more information.
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. Refer to chapter 5 for more information.
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 in chapter 1.
In the following test procedures, the controller will be energized. As a safety
precaution, you must make certain that machine motion will 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 will be 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 is to open the circuit at a
point between the motor starter and the relay contact.
!
ATTENTION: Machine motion during system checkout can be
hazardous to personnel. During the checkout procedures 3, 4, 5,
and 6, you must disconnect all devices that, when energized,
might cause machine motion.
1. Inspect Your Installation
2. Disconnect Motion-causing
Devices