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The operating principle safety switches
There are two switch disconnectors in
DC safety switches: one for the main circuit
and the other for the excitation circuit and
control circuit auxiliary contacts. Electrical
interlocking with push button, which installed the
door the enclosure, for operating the safety switch is
available accessory.
40
1SCC340006C0201
ABB
. auxiliary contacts the
utilization category\DC-23 safety
switch have earlybreak feature,
meaning that they open before the
contacts the safety switch--------
Connecting the auxiliary contacts
to the rectifier bridge control
circuit recommended, because
it enables the currentless
operation the safety switch
to OFF-position. Although the
safety switch DC-23 utilization
category able break full motor
current (4xIe), using the safety
switch motor controller not
recommended.
A handle that can padlocked into both positions is
available request. There is
also lock frame available, which can provided with
key locking for Castell, Lowe&Fletcher Ronis.
The bigger safety switches are
DC-20-categorized
This means that the switch shall not operated when
loaded. order prevent operating mistakes, they can
be equipped with various locking devices.
All handles the enclosed switches can equipped
with padlocks, which prevent the operating O-position.
From I-position to
O-position^fifst
the switch the
main circuit and
then the switch of
the magnetizing
circuit. Furthermore, connecting the
interlocking coil the control unit the rectifier bridge,
the breaking full DC-load can prevented.
Interlocking
The n.o.
The switch disconnectors are
mechanically interlocked that they can be
perated only the right order:
From O-position
to I-position: first
the switch the
excitation circuit
and then the switch
of the main circuit
