Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
135
System Start-Up
Chapter 6
4. Check that the circuit breakers and fuses of the correct capacity and
rating are installed in the correct locations.
5. Check that all subsections are isolated from each other.
Power Distribution and First
Power Up
The power distribution and first power up verifies that the power distribution
circuits function as designed and as detailed in the drawings. It shows the
correct voltages are appearing, and only in the correct places. It also provides an
opportunity to verify correct operation of any power indicators outside the
controller itself.
Do the following:
1. Make sure all modules are removed.
2. Trip all circuit breakers and disengage all power distribution fuses and
field fuses.
3. Apply power to the incoming power terminals.
4. It is good practice to switch on power supplies to field devices before
supplies to the controller. Devise a formal sequence in which to switch
on individual circuits.
• In sequence, check each circuit breaker or fuse for zero volts on the
destination side, and then close the circuit breaker or fuse and verify that
the appropriate voltage appears.
• Check that any associated power indicator is lit.
• As each circuit breaker is tested, leave the breaker in the ‘on’ position so
that any unwanted connection between different power circuits can be
detected.
5. Trip and re-instate each circuit breaker in turn and verify the correct
circuits are isolated and restored. Similarly disengage and replace each
fuse and verify the associated circuits.
6. At the same time verify correct operation of any power indicators
supplied with the system.
NOTE
Before you begin this task, you must have checked the power distribution
integrity.
