Adjustments; Recommended Tools And Test Equipment; Figure 4-2. Assembly Of Permanent Magnet - Hitachi PN-150BE Manual

Replacement contact blocks MUST be of the same general
design.
Carefully install the dowel pins, tapping in until they are flush with the aluminum surface.
If it is necessary to install a used contact block from another relay, remove only one of
the dowel pins from the aluminum frame. Carefully press the block on the remaining pin
and fasten in place with the screws. One dowel pin will adequately hold the block in
place.
Do not overtighten or force parts when reassembling a relay. Upon completion of
reassembly, calibrate the relay as directed in Section 4.6.
4.4.3.2. Permanent Magnet
The polarity of the magnet should be such that the top end farthest from the two
notched holes will attract the end of a compass needle which points toward geographic
South.
The permanent magnet assembly should be applied to the relay as shown in Figure 4-2
making sure that the shunt between the magnet and the magnet extension is touching
the pole piece. Tighten the two long screws holding the magnet assembly to the pole
piece sufficiently to straighten the curved strap against the magnet. Bend the nut locks
securely up against the sides of the screw heads.
POLE PIECE
MAGNETIC EXTENSION
PHOSPHOR BRONZE OR
STEEL SCREW AS REQUIRED

4.5. ADJUSTMENTS

All adjusting and testing must be done with the relay in its normal operating position.

4.5.1. Recommended Tools and Test Equipment

Gap Gauge - 0.001 in. to 0.200 in.
Pillar File - #6
Copyright 2019
MAGNET
MAGNETIC SHUNT

Figure 4-2. Assembly of Permanent Magnet

SM 4551L, Rev. 0 1, March 2019
PN-150BE Biased High Efficiency Vital Relay
INDICATOR
ADJUSTABLE
SHUNT
29/32
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