Operation; Initial Energization - Toshiba JK 720 Instruction Manual

Basic Installation and Operation Guide

OPERATION

Initial Energization

Energizing a medium voltage controller or line-up of controllers
for the first time is potentially dangerous. Therefore only qualified
personnel, as defined in the SAFETY section of this manual,
should energize the equipment (Fig. 38). If equipment damage or
poor installation practices have escaped detection in the PRE-
ENERGIZATION CHECK, major damage, including personal
injury, can result when the power is applied. Extra precaution is
recommended on initial energization of the equipment.
Hazardous Voltage. Improperly
installed or damaged equipment will
result in severe injury, death, and
property loss. Correct all problems
prior to energizing this equipment.
Only qualified personnel should
energize this equipment.
In order to minimize the risk of injury or damage, there should be
no load on the controller or group of controllers when incoming
power is first turned on. All downstream loads, including
distribution equipment and other remote devices, should be
turned off. The isolation switch ahead of each controller should
be in the off position.
The equipment should be energized in sequence by starting at
the source end of the system and working towards the load end.
First, the main devices, then the feeder devices, and then the
branch circuit devices should be closed.
With all removable barriers in place and all doors closed and
latched, the devices should be turned on with a firm, positive
motion. Protective devices and switches that are not quick-acting
should not be "teased" into the closed (or open) positions. The
isolation switch handle should be moved between the OFF and
ON positions in a single continuous smooth movement (Fig. 39).
After all disconnect devices have been closed, contactors may be
operated to turn on loads such as motors, transformers, variable
frequency drives, etc.
TOSHIBA
JK Series 720 Controllers
Fig. 38 Preparing For Initial Energization
Fig. 39 Closing Isolation Switch
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