Document: 553632
(ICSTT-RM448_EN_P) Issue: 08:
4-3
Procedure to check Power Distribution Integrity
Procedure to check Power Distribution IntegrityProcedure to check Power Distribution Integrity
Procedure to check Power Distribution Integrity
Note: Before you begin this task, you must have checked the ground bonding.
Check the integrity of the power distribution system to verify that each power
distribution sub-section is wired in accordance with the drawings and that the
subsections are isolated from each other. Do the following:
1) Make sure all power sources are isolated.
2) Switch off all circuit breakers and open distribution fuses.
3) Remove all modules from the controller.
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
Power Distribution and First Power UpPower Distribution and First Power Up
Power Distribution and First Power Up
Note: Before you begin this task, you must have checked the power distribution
integrity.
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.
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