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Preventive Maintenance<br />
4. SECTION 4 – PREVENTIVE MAINTENANCE<br />
4.1. GENERAL<br />
This section includes the preventive maintenance procedures associated with proper<br />
<strong>Type</strong> B relay operation. These procedures are provided as a minimum requirement, and<br />
may need to be modified due to local operational conditions or requirements.<br />
Tests and inspections must include the following: measurement of PICKUP current and<br />
DROPAWAY current, timing of slow operating and timing relays, and visual inspection<br />
of contacts for damage or misalignment, corrosion or other contamination of parts, loose<br />
parts inside cover, broken seal, cracked, broken or discolored covers and wear particles<br />
on inside of cover.<br />
WARNING<br />
NOTIFY AND OBTAIN PERMISSION FROM CENTRAL CONTROL<br />
PRIOR TO PERFORMING ANY ELECTRICAL TESTS ON RELAYS.<br />
DURING THE ELECTRICAL TESTS RELAYS ARE INTENTIONALLY,<br />
MANUALLY ACTIVATED. THIS ACTIVATION AFFECTS THE RELAY<br />
CIRCUIT(S) AND POSES A POTENTIAL THREAT TO RAIL SAFETY. IT<br />
MAY PROVIDE FALSE INFORMATION, INTERRUPT OPERATION, AND<br />
CAUSE ALARMS TO INADVERTENTLY SOUND AND/OR BE<br />
DISPLAYED. TAKE ALL STEPS NECESSARY TO ENSURE THE SAFE<br />
PASSAGE OF TRAFFIC IS MAINTAINED.<br />
NOTIFY CENTRAL CONTROL WHEN TESTING IS COMPLETE AND<br />
THE RELAY IS BACK IN OPERATION.<br />
B relays identified as not passing inspection or meeting defined tolerances during the<br />
relay electrical test must be removed from service. To return a relay to service, the<br />
mechanical tests and adjustments provided in Section 6, Corrective Maintenance must<br />
be performed, followed by electrical tests to verify relay performance.<br />
The following test and adjustment procedures require qualified maintenance personnel<br />
to test the relay portion of <strong>Type</strong> B relays.<br />
Specifications for testing and inspecting all <strong>Alstom</strong> relays are given on relay Engineering<br />
Data (ED) sheets. Relay drawing and catalog numbers can be used with Appendix A to<br />
look up the Engineering Data (ED) Sheet number. To determine a relay's drawing or<br />
catalog number, refer to Heading 1.2.2., Identification. For copies of ED sheets, consult<br />
your <strong>Alstom</strong> Sales Representative or <strong>Alstom</strong> Customer Service.<br />
Troubleshooting procedures are provided in Section 5, Troubleshooting. Mechanical<br />
tests and relay replacement procedures are provided in Section 6, Corrective<br />
Maintenance.<br />
P1457, Rev. Nov/07 4–1 <strong>Alstom</strong> Signaling Inc.
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