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Type B Vital Relays - Alstom

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Corrective Maintenance<br />

Table 6–11. Mechanical Test and Adjustment Procedure (Cont.)<br />

Step<br />

Procedure<br />

15 Check that all armature springs on the contact block are adjusted with a down<br />

pressure. It is important to keep the down pressure about the same on all back<br />

contacts. Each roller on the contact spring bears on the bottom of its slot in the<br />

pusher, when the pusher is raised sufficiently to just open the back contacts.<br />

Typical B Relay<br />

COMPRESSION SPRING<br />

COVER<br />

COIL SPRING STUD<br />

ARMATURE STOP SCREW<br />

BRIDGE OR ARM. EXTENSION<br />

PUSHER<br />

BACK CONTACT<br />

HEEL CONTACT<br />

FRONT CONTACT<br />

CONTACT PRONGS<br />

BASE<br />

CONTACT GROUP<br />

PRESSURE PLATES<br />

STOP PLATES<br />

PUSHER JAW<br />

PUSHER RETAINING CLIPS<br />

ROLLER ON FINGER<br />

ARMATURE<br />

ARMATURE<br />

RETAINING<br />

PLATE<br />

ADJ. NUT<br />

LOCK NUT<br />

YOKE<br />

NUT<br />

ARMATURE<br />

BEARING<br />

PLATE<br />

NAME<br />

PLATE<br />

SAFETY<br />

PIN<br />

COIL<br />

REGISTRATION COIL<br />

PLATES PRONGS<br />

ADJUSTABLE RESIDUAL SCREW<br />

CORE<br />

NOTE: SOME PARTS MAY DIFFER IN DETAIL FROM THOSE SHOWN ABOVE BUT NAME<br />

DESIGNATION REMAINS THE SAME.<br />

P1457, Rev. Nov/07 6–21 <strong>Alstom</strong> Signaling Inc.

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