Bell System Plant Series Adjusting Instructions

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BELL SYSTEM PRACTICES
Plant Series
SECTION 032-724-701
Issue 8, December 1967
AT & TCo Standard
KEYS
547, 552, 576, 579, 582, 583, 585, 592, 596, 597,
614, 615, 624, 625, 630, AND 650 TYPES
REQUIREMENTS AND ADJUSTING PROCEDURES
1. GENERAL
1.01
This section is reissued to add requirements
and adjusting procedures for 625-, 630-, and
650-type keys, to add information covering KS-14774
L2G lubricant, and to revise the procedure covering
plunger movement of 547 -type keys.
1.02
Reference shall be made to Section 020-010-711
covering additional information necessary
for the proper application of the requirements listed
herein.
1.03
Asterisk(*): Requirements are marked with
an asterisk when to check for them would
necessitate dismantling or dismounting of apparatus
or would affect the adjustments involved or other
adjustments. No check need be made for these
requirements unless the apparatus or part is made
accessible for other reasons or its performance
indicates that such a check is advisable.
1.04 Dagger (t):
Requirements are marked with
both a dagger and an asterisk when 1.03
covering the use of the asterisk does not apply to
the 582- and 583-type keys.
1.05 The normal (unoperated) position of a
pushbutton-type key
is that position in
which the plunger is at the top of the stroke and
the normally open contacts are open and the
normally closed contacts are closed.
1.06
The operated position of a pushbutton-type
key
is that position in which the plunger is
depressed to the limit of its stroke and the normally
open contacts are closed and the normally closed
contacts are open.
1.07
The normal (unoperated) position of a
rotating plunger-type key is that position
in which the plunger springs rest against the wider
surface of the plunger and the normally open
contacts are open and the normally closed contacts
are closed.
1.08 The operated position of a locking rotating
plunger-type key
is that position in which
the plunger is rotated to the locked position.
In
this position, the normally closed contacts are open
and the normally open contacts are closed. On
keys equipped with 2-way throw plungers only,
those contacts on the side to which the plunger is
rotated are operated.
1.09 · •The 630-type key assumes the locked
and unlocked positions
on alternate
operations of the plunger: push to lock, push to
unlock .•
1.10
•The unlocked position of a 630-type key
is that position in which the plunger is at
the top of the stroke and the normally open contacts
are open and the normally closed contacts are
closed .•
1.11
•The locked position of a 630-type key
is
that position where the plunger remains
118-inch below its outermost unlocked position after
the plunger has been fully depressed and released.
See 1.12 or 1.13 .•
1.12
•In the locked position of a 630-type key
except the 630R key, all normally open
contacts are closed and all normally closed contacts
are open .•
1 .13
•630R Key:
In the locked position of a
630R key, the normally open contacts on
the spring pile-up with three pairs of contacts are
open and the normally open contacts on the single
pair are closed. However, when the plunger is
fully depressed, the three pairs of contacts are
momentarily closed and the single pair remains
closed.4l
1.14 The operated position of 552M key
is that
position in which the 2-way throw plunger
is rotated from the normal position in a clockwise
or counterclockwise direction and the normally open
contacts, on the side to which the plunger is
rotated, are closed.
© American Telephone and Telegraph Company, 1967
Printed in U.S.A.
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