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2.
INSTALLATION
2.1. General
Relays plug directly into a mounting base that is secured to a rack. The only installation
instructions required are for the mounting base.
2.1.1. Care in Handling
It is very important that these vane relays be handled carefully so that undue stresses
are not applied to the vane structure, which might throw the vane out of adjustment. A
piece of twine, which firmly holds the vane, is applied to the relay when it leaves the
factory, via a tapped hole in the rear of the relay. The twine must be removed when the
relay is placed in service. A plug screw 8-32 x ¼ (included) should be installed in this
hole.
2.2. Mounting Base
Secure the mounting base directly to the rack using the hardware furnished. All wiring
terminates at the rear of the mounting base to solderless terminals (contact
receptacles). Mounting base details are shown in Figure 4-4.
2.3. Relay Indexing
Relays are factory equipped with indexing pins to prevent insertion of an incorrect relay
into a mounting base. Each relay is accompanied by an indexing plate that is applied to
the mounting base at the time of initial installation. A typical plug-in relay with indexing
pins and base with corresponding indexing plate is shown in Figure 2-1.
The following data defines the indexing that has been established for relays covered by
this manual.
a. The index code always consists of four figures (such as 5509) and is used for
both the relay and the indexing plate on the mounting base.
b. The index code for each relay can be determined from the relay part number and
its suffix, which is marked on the nameplate attached to the front of the relay.
The first two digits of the index code are the last two digits of the part number,
and the second two digits of the index code are the last two digits of the suffix.
The index number thus obtained should agree with the placement of the indexing
pins in the numbered vertical rows on the back of the relay starting with the top
pin and reading down.
Copyright 2019
SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
2-1
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