- 12 -
Use the following procedures if the VCB will not be operated for a long period of time after it
has been installed, or if it must be stored for a long period of time prior to installation. Be sure
to observe the precautions for storage and installation locations (see page 5).
(1) When storing the unit, cover it with a dust cover.
(2) Avoid locations subject to high humidity or exposed to direct sunlight.
(3) Inspect the unit periodically and make sure there are no problems such as condensation,
moisture absorption, rust, corrosion or insects inside the equipment. If such problems are
discovered, inspect the equipment carefully and repair it before it is operated.
To prevent electric shock or other injury, do not use the unit when a
problem has been discovered during an inspection of that unit.
To prevent injury or damage to the equipment, make sure the unit is
standing straight up. NEVER lay it on its side or place it upside-down.
(4) When the equipment has been stored or has been idle for a long period of time, do not
install or begin operating the unit immediately. Perform the procedures listed in sections
7.3 and 7.4 and the withstand voltage test* for the control circuit to make sure there are no
problems before installing or operating the unit.
*The withstand voltage on control circuits
The withstand voltage test for motor spring operation type circuit breaker shall be
performed in charged condition.
The power frequency withstand voltage on control circuits except charging motor is 2000V
AC, since the withstand voltage for charging motor is 1500V AC.
The motor circuit shall be disconnected before withstand voltage test on control circuits.
(Example: The connector plug (white) on upper-center of control board should be
disconnected (pull out) after removing the front cover of circuit breaker. This will make the
motor circuit disconnect
Note: The connector plug and front cover must be returned to proper position after
withstand voltage test.
CONTROL
BOARD
(
UNIT
)
CONNECTOR PLUG
(WHITE)
WARNING
CAUTION