Type B Vital Relays - Alstom

Installation
3. SECTION 3 – INSTALLATION
3.1. GENERAL
This section contains general installation procedures for Type B relays. Included is a
procedure for inspecting each relay prior to installation, followed by the installation and
adjustment procedure.
3.2. RELAY INSTALLATION TOOLS AND SUPPLIES
See Appendix C for a summary of B relay tools. See Section 7 for a listing of installation
plugboards and supplies.
3.3. INSPECTION
Upon receipt of a shipment of Type B relays, inspect them for cleanliness and overall
condition. Also, always verify the operating characteristics of the relay before installing it
in a particular circuit.
Prior to installing a Type B relay, follow the inspection procedure provided in Table
3–1. Refer to section 2, Figure 2–1 for an illustration identifying the basic B relay
components.
Table 3–1. B Relay Pre-Installation Inspection Procedure
Step
Procedure
1 Check that the relay cover and seal are not damaged.
WARNING
BREAKING THE RELAY COVER SEAL VOIDS THE WARRANTY
ON THE RELAY.
2 Verify that the relay prong surfaces are clean and not bent.
While the prongs of the relay that engage with the terminals in the plugboard are
clean and adjusted when they leave the factory, there is always the chance that
they may become dirty or bent in handling. If prongs are dirty, clean by
burnishing.
3 When relay racks complete with plugboards are received, verify they are clean
and not broken or cracked. The terminals should lie close to the insulators. The
guide rods should be straight and at right angles to the plugboard.
P1457, Rev. Nov/07 3–1 Alstom Signaling Inc.