Type B Vital Relays - Alstom

Installation
3.4. INSTALLATION
The B relay plugs into a plugboard assembly mounted on rack support bars. Plugboard
assemblies:
• are available in either B1 or B2 sizes
• use insulators for separating the solder or crimp type terminals
• hold the guide rods for alignment and securing the relay
• hold the registration plates
• can be provided with current or voltage test posts
For a listing of plugboards, specialty parts, and mounting hardware refer to Section
7.17., B Relay Plugboards and Terminal Boards.
Most B relays are installed using the procedure provided in Table 3–2.
Microchron II Timer Relay installation includes setting the timer. Follow the steps in
Table 3–3 in the order provided to install a Microchron II Timer Relay (DC) or the steps
in Table 3–5 to install an AC Microchron II Timer Relay.
Built-in surge circuitry in the Microchron II Timer Relay provides adequate protection
from transients on the power leads for circuits confined to a bungalow or train control
relay room containing an installed Microchron II Timer Relay. If the energy circuit has
contacts remote from the bungalow, follow the procedure in Table 3–4 to provide
additional surge protection.
NOTE
To assure safe application of the AC Microchron II Timer Relay, all
application circuits must be reviewed by Alstom engineering before it will
be approved for use.
P1457, Rev. Nov/07 3–2 Alstom Signaling Inc.