Models 5E, 5F, 5G & 5H Electric Switch Machines: Single ... - Alstom

Theory of Operation2.5.9.1. Switch Operating RelayTable 2–1 shows the correlation between a switch call and the typical pick or drop of thenamed relay, with the switch machine moving its throw bar to the requested position.Certain relays (with an asterisk in the table below) will pick only if manually levered fromeither an emergency or central control panel. An upward arrow signifies the relay ispicked; a downward arrow signifies the relay has dropped. Table 2–2 provides the relayabbreviation definitions.Table 2–1. Typical Switch Request and Affected Relays, Position of Relay Per RequestSwitchRequestRelay Position Switch Action Relay PositionNORMAL *RP↓ RWZ↓ RW↓ SWITCH MACHINE RWP↓ RWC↓*NP↑ NWZ↑ NW↑ THROWS TO NWP↑ NWC↑REVERSE *RP↑ RWZ↑ RW↑ REQUESTED RWP↑ RWC↑*NP↓ NWZ↓ NW↓POSITIONNWP↓ NWC↓Table 2–2. Relay Position Abbreviation DefinitionsAbbreviationRPNPRWZNWZRWNWRWPNWPRWCNWCDefinitionReverse Repeater RelayNormal Repeater RelayReverse Switch Call RelayNormal Switch Call RelayReverse Switch RelayNormal Switch RelayReverse Switch Repeater RelayNormal Switch Repeater RelayReverse Switch Correspondence RelayNormal Switch Correspondence RelayP1293, Rev. Jun/07 2–35 Alstom Signaling Inc.