Type B Vital Relays - Alstom

Corrective Maintenance
6.5.2. Mechanical Test and Adjustment Procedure
The Mechanical Test and Adjustment Procedure provided in Table 6–11 applies to
standard B1 and B2 relays, not specialty relays.
Table 6–11. Mechanical Test and Adjustment Procedure
Step
Procedure
1 Inspect the relay components by following the procedure in Tables 6–10.
NOTE
If the relay is a Microchron II Timer Relay (AC or DC), first remove
the timer using the procedure provided in Table 6–12.
2 Mount the relay onto Shop Test Rack or on a plugboard, supporting it about 18
inches above a bench on a plugboard holding stand.
Secure the relay with two retaining nuts to hold the relay in place.
Example Shop Test Rack
G
16 26 36
15 25 35
14 24 34
13 23 33
12 22 32
11 21 31
46 56 66
45 55 65
44 54 64
43 53 63
42 52 62
41 51 61
E
F
6C
6D
D
C
1C
1D
6C
6D
C
D
A
B
X
This rack is designed for both B1 and B2 relays. One of the guide rods is
removable. For testing B1 relays, screw the removable guide rod into location F.
For testing B2 relays, screw it into location E. Meter leads should have alligator
clips for clipping on to terminal posts G.
3 Proceed with this procedure to check the following areas to verify that all
adjustments are proper: armature air gap, bridge travel, back and front contact
make and break, contact openings and pressures.
4 Energize the relay when required. To power the relay, apply a variable current
source to the coil leads (one coming from each relay coil), utilizing a meter tip
plug to interface the current source with the female cap connectors on the coil
leads. Refer to the relay wiring diagram if necessary.
P1457, Rev. Nov/07 6–17 Alstom Signaling Inc.