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3.
FILED MAINTENANCE
3.1. Introduction
This section provides the necessary periodic preventive maintenance procedures which
must be performed to ensure continuous, proper, and efficient operation of the PC-
150BE relays covered in this manual. Field maintenance covers periodic inspections
and performance tests.
3.2. Periodic Performance Test
3.2.1. Cleaning
Before inspecting and testing the relay, if necessary use a soft cloth to clean the exterior
to remove any dirt or dust that may have collected. A safe cleaning solution of alcohol
and water may be used for removal of accumulated dirt, grease, etc.
3.2.2. Service Requirements
3.2.2.1. General
All vital relays must be inspected and tested at least once every two (2) years. The tests
and inspections are to include: pick-up current, drop-away current, timing of slow
operating and timing relays; and visual inspection of contacts for damage or
misalignment, corrosion or other contamination of parts, loose parts inside of the cover,
broken seal, and cracked or broken cover.
All vital relays installed in locomotive or car-carried equipment are to be inspected and
tested at least every two (2) years as above. In addition, every four years the relays are
to be removed from service and adjusted, repaired and tested.
Relays not passing the above stated tests and inspections must be replaced and not
returned to service until the operating characteristics and conditions are in accordance
with STS USA specifications.
3.2.2.2. In-Service Test
It is recommended that line relays in service be removed from service for shop repairs
when one or more of the following conditions occur: (Use as a reference the calibration
values given in Table 4-2.)
a. Drop-Away value (D.A.) falls below 67% of the value given.
b. Full-Drop-Away value (F.D.A.) falls below 33% of the value given.
c. Full Stroke value (F.S.) increases to more than 110% of the value given.
3.2.2.3. Test Procedures
Test the operating characteristics of the PN-150BE relays as given in Section 4.6 in this
manual.
Copyright 2019
PN-150BE Biased High Efficiency Vital Relay
SM 4551L, Rev. 0 1, March 2019
3-1
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