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PN-152SO Switch Overload Relay
3.
FIELD MAINTENANCE
3.1. Introduction
This section provides the necessary periodic preventive maintenance procedures that
must be performed to ensure continuous, proper, and efficient operation of the PV-250
style 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 or common laundry detergent may be used for removal of accumulated dirt,
grease, etc.
3.2.2. Service Requirements
3.2.2.1. General
All PN-152SO relays must be inspected and tested at least every four (4) years. The
tests (see Table 4-2) and inspections are to include: pick-up time at given current; visual
inspection of contacts for damage, misalignment, corrosion or other contamination of
parts; loose parts inside of the cover; a broken seal; and a cracked or broken cover.
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 track relays in service be removed from service for shop repairs
when the calibration values are out of specification.
3.2.2.3. Test Procedures
Test the operating characteristics of the PN-152SO style relays as described in Section
4.1.5 in this manual.
Copyright 2019
SM 5929 Rev. 23, March 2019
3-1
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