Bell System Plant Series Adjusting Instructions

BELL SYSTEM PRACTICES
Plant Series
SECTION 032-724-701
Issue 9, September 1969
AT& TCo Standard
KEYS
547, 552, 576, 579, 582, 583, 585, 592, 596, 597,
614, 615, 624, 625, 630, 648A, 649A, AND 650 TYPES
REQUIREMENTS AND ADJUSTING PROCEDURES
1. GENERAL
1 .01
This section covers the keys enumerated
above.
1.02
This section is reissued to:
• Add the 648A- and 649A-type keys.
• Add illustrations of the 648A-, 649A-, and
650-type keys.
• Revise 2.10, changing the plunger operate
pressure for the 624- and 650-type keys.
• Revise 3.02 (2) and (3).
1 .03
Reference shall be made to Section 020-010-711
covering additional information necessary
for the proper application of the requirements listed
herein.
1.04
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.
1.05
Dagger(f ): Requirements are marked with
both a dagger and an asterisk when 1.04
covering the use of the asterisk does not apply to
the 582- and 583-type keys.
1.06
The normal (unoperated) position of a
pushbutton-type key is that position in
which the plunger is at the top of the stoke and
the normally open contacts are open and the
normally closed contacts are closed.
1.07
The operated position of a pushbutton-type
key is that position in which the plunger is
depressed to limit of its stroke and the normally
open contacts are closed and the normally closed
contacts are open.
1.08
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 .09
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.
1.1 0
The 630-type key assumes the locked
and unlocked positions on alternate
operations of the plunger: push to lock, push to
unlock.
1 .11
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. 12
The locked position of a 630-type key is
that position where the plunger remains 1/8
inch below its outermost unlocked position after
the plunger has been fully depressed and released.
See 1.13 or 1.14.
1. 13
In the locked position of a 630-type key,
except the 630R and 630AB keys, all normally
open contacts are closed and all normally closed
contacts are open.
© American Telephone and Telegraph company, 1969
Printed in U.S.A.
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