Type B Vital Relays - Alstom

Corrective Maintenance
6. SECTION 6 – CORRECTIVE MAINTENANCE
6.1. GENERAL PURPOSE
This section describes corrective maintenance procedures for Type B relays. Corrective
maintenance is intended to restore malfunctioning equipment to an operable condition
as quickly as possible. The procedures included in this section include:
• Relay Removal and Replacement Procedures to remove relays not meeting
inspection or electrical criteria
• Relay Wiring Change Procedures for plugboards and terminals
• Mechanical Test and Adjustment Procedures for relays removed from service
Specifications for testing and inspecting all Alstom relays are given on relay Engineering
Data (ED) sheets. Relay drawing and catalog numbers can be used with Appendix A to
look up the Engineering Data (ED) Sheet number. To determine a relay's drawing or
catalog number, refer to Heading 1.2.2., Identification For copies of ED sheets, consult
your Alstom Sales Representative or Alstom Customer Service.
Table 6–1. Corrective Maintenance Procedures
Description
Table
B Relay Removal and Replacement Procedure 6–2
Terminal Removal Procedure 6–3
Terminal Installation Procedure 6–4
Terminal Soldering Procedure 6–5
Terminal Crimping Procedure 6–6
Insulator Removal and Installation Procedure 6–7
Current Test Terminal Wiring Procedure 6–8
Voltage Test Terminal Wiring Procedure 6–9
Relay Structure Inspection Procedure 6–10
Mechanical Test and Adjustment Procedure (for standard B1 and
B2 relays)
6–11
Microchron II Timer Electronics Removal Procedure 6–12
Microchron II Timer Electronics Replacement Procedure 6–13
P1457, Rev. Nov/07 6–1 Alstom Signaling Inc.