Type B Vital Relays - Alstom

Preventive Maintenance
Table 4–3. Vane Relay Visual Inspection Procedure
Step
Procedure
1 Check that the relay cover and seal are not cracked, broken or discolored.
2 Verify that relay components are not loose inside the cover.
PUSHER
BACK CONTACT
HEEL CONTACT
FRONT CONTACT
CONTACT PRONGS
BASE
CONTACT GROUP
PRESSURE PLATES
STOP PLATES
SHOCK INDICATOR
SHAFT BEARING
COUNTER WEIGHT
VANE
LOCAL COIL WINDING
3 Verify the contacting surfaces are clean, smooth, and not bent or mis-aligned.
Relay vane must not contact either local or track lamina in any position of the
vane.
4 Verify that normally open co-acting contacts meet squarely and simultaneously
when relay is energized. Contacts should have wipe as vane goes through to its
front stop.
When relay is deenergized, normally closed contacts should meet squarely and
simultaneously. Contacts should have wipe as vane meets its backstop.
During pick up and drop away, vane must move freely in its jewel bearings.
There should be no indication of friction or binding in the bearings.
If any friction or binding is observed the relay must be removed and replaced.
P1457, Rev. Nov/07 4–6 Alstom Signaling Inc.