Type B Vital Relays - Alstom

Corrective Maintenance
6.5. MECHANICAL TEST PROCEDURES
The mechanical test procedures are performed to ensure that the relay structure is
properly adjusted. Table 6–10 provides the Relay Structure Inspection Procedure. Table
6–11 provides the Mechanical Test and Adjustment Procedure.
The mechanical test and adjustment procedures take place with the B relay cover
removed. These procedures include verification of armature air gap, bridge travel and
contact group measurements. Components identified as not meeting defined tolerances
during the relay mechanical test are adjusted during the test procedure. Mechanical
adjustments must be followed by electrical tests to verify relay performance.
WARNING
BREAKING THE RELAY COVER SEAL VOIDS THE WARRANTY ON
THE RELAY.
P1457, Rev. Nov/07 6–13 Alstom Signaling Inc.