Table of Contents
Advertisement
Twist Drill - #42
Gram Gauge - 250 Grams
Screw Driver - Torque Measuring
4.5.2. Magnet and Magnet Extension
Insert a 0.117 inch spacer between the stop pin and the pole face and adjust the
permanent magnet extension so that it touches the Teflon back stop tape or the back
stop pins, whichever is present on the bottom of the armature.
After adjustment, the magnet and magnet extension should be centered on each other
and on the armature. On relays without back stop pins, the bottom of the armature
should fit flush on the surface of the magnet extension, with no air gaps. On relays with
back stop pins, the air gap should be of uniform width across the surface of the magnet
extension.
4.5.3. Permanent Magnet
The permanent magnet extension should be adjusted so that it touches the two stop
pins on the bottom of the armature with the nominal spacer, specified in Table 4-1,
inserted between the main armature stop pin and the upper pole face. If necessary in
order to obtain calibration values or contact openings, this spacer may be varied within
the limits given in Table 4-1.
With the armature released, both back stop pins should make contact with the
permanent magnet extension face and neither should project over the edge of the
permanent magnet. In this position, the air gap at the permanent magnet pole face
should average 0.150 inch parallel and must not be less than 0.003 inch at any point.
This is the physical air gap from plated pole face to plated armature.
4.5.4. Indicator
Adjustment of the armature position indicator after calibration should be made so that
the bottom of the red painted surface is 29/32-inch from the main body of the relay
frame. Viewed from the front of the relay with cover applied, the red indicator should be
in full view with the armature in the de-energized position, and should be hidden with
the armature in the energized position. Refer to Figure 4-2 for illustration concerning this
adjustment.
4.5.5. Contact Adjustment
The fingers supporting the contact springs should be straight and approximately at right
angles to the relay base. All adjustments of contacts should be made by bending the
brass finger with a bending tool (M102225) applied between the rivets on the heel
springs or near the bakelite contact block on the front and back springs. Because of the
effect of the weight of the contact tips, all checks of contact adjustment should be made
with the relay in the normal upright position. Contact support fingers should be adjusted
sideways by using the alignment tool (M330459 for heels and M330458 for fronts and
backs) so that the contact tips on all three members are approximately centered.
The independent (#2) back contact heel spring should be aligned with the other heel
springs when the operating arm is removed.
Copyright 2019
PN-150BE Biased High Efficiency Vital Relay
SM 4551L, Rev. 0 1, March 2019
-
4-8
Hide quick links:
Advertisement
Table of Contents
