Bell System Practices Plant Series Adjustments page 12

573-115-700
SECTION
2. 05 Selector Mechanism (Cont.)
SELECTOR ARMATURE SPRING (FOR UNITS W ITH SINGLE ANTI-:FREEZE BUTTON ON SELECTOR
-REQUIREMENT --- (PRELIMINARY) WITH START LEVER, MARKING AND SPACING LOCK LEVERS ON
PART OF THEIR CAMS, HOOK SCALE UNDER END OF ARMATURE EXTENSION (HOLD AS NEARLY
VERTICAL AS POSSIBLE).
( a)
1 -l/ 2
MIN.
MIN .
(b) 2 -l/ 2
TO PULL ARMATURE TO MARKING POSITION.
TO ADJUST -- - POSITION ADJUSTING NUT.
REQUIREMENT --- (FINAL) REFER TO SELECTOR RECENING MARGIN PAR.
NOTE
SPRING TENSIONS SHOWN
ON THIS PAGE PERMIT
OPERATION OF PRINTER
PRIOR TO MEASUREMENT
OF RECEIVING MARGINS.
REFINE SPRING TENSION
FOR MAXIMUM SELECTOR
PERFORMANCE WITH UNIT
CONNECTED TO SPECIFIC
CIRCUIT IN WHICH IT IS TO
FUNCTION (OPERATING AT
DESIRED SPEED AND
LINE CURRENT). SEE PAR. 2.11 .
SELECTOR ARMATURE SPRING (FOR UN ITS WITH TWO ANTI - FREEZE BUTTONS· ON SELECTOR ARMATURE)
REQUIREMENT --- (PRELIMINARY) WITH START LEVER, MARKING AND SPACING LOCK LEVERS ON HIGH
PART OF THEIR CAMS, HOOK SCALE UNDER END OF ARMATURE EXTENSION (HOLD AS NEARLY
VERTICAL AS POSSIBLE) .
0.020 AMPERES
14GRAMS
TO PULL REAR BUTTON AGAINST ITS POLE PIECE
TO ADJUST ---POSITION ADJUSTING NUT.
REQUIREMENT -- - (FINAL) WHEN A DISTORTION TEST SET IS AVAILABLE, REFINE SELECTOR ARMATURE
SPRING ADJUSTMENT TO MEET SELECTOR RECENING MARGIN PAR.
MI\GNETS ENERGIZED, FRONT ANTI - FREEZE BUTTON MUST BE IN CONTACT WITH ITS MAGNET CORE.
Page 12
IT SHOULD REQUIRE
OZ S . ------------------------- MAX .
OZ S . - --------- - ---------------- MAX. 3 OZ S . FOR 60 MA OPERATION.
\
IT SHOULD REQUIRE
0.030 AMPERES 0.060 AMPERES
18GRAMS
21
FRONT BUTTON
OZ S . FOR 20 MA OPERATION.
2
MARKING LOCK LEVER
CAM
START LEVER
GRAMS
2.11.
�
/
ARMATURE)
HIGH
2.11
NUT
ARMATURE SPRING
SPACING LOCK LEVER
NOTE - - - WITH SELECTOR
ARMATURE SPRING
.