Control Power Transformer - Toshiba JK Series Instructions Manual

Page 18
F .

Control Power Transformer

A control power transformer (Fig. 18) is
mounted on the left-hand side wall of the
controller compartment.
t h e f u s e d p r i m a r y o f t h e c o n t r o l p o w e r
transformer from stabs on the withdrawable
contactor carriage. These stabs engage clips
on the transformer
inserted into the compartment.
Optionally, a second transformer (Fig.
normally used as an
can be mounted in the compartment. When
this option is supplied, a third set of stabs is
furnished on the withdrawable carriage. The
two transformers are then connected in an
open-delta arrangement.
Another option sometimes supplied is a second
control power transformer connected in parallel
with the first to increase the available KVA
capacity.
B o t h t h e c o n t r o l a n d o p t i o n a l p o t e n t i a l
transformer are used to supply power to the
low voltage circuits of the controller. This
includes power for
operating coil and for various instrumentation.
An electrical interlock
that all load is disconnected from the control
power transformer secondary winding before
the power isolation switch can be opened or
closed.
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Power is supplied
when the carriage
instrument transformer,
the vacuum contactor
is provided to ensure
GENERAL DESCRIPTION
to
is
Fig. 18 Control Power Transformer
Fig. 19 Optional Transformer