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Type B Vital Relays - Alstom

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Troubleshooting<br />

5.4.1. DC Relay Troubleshooting<br />

DC RELAY DOES<br />

NOT PICK UP<br />

CHECK FOR CORRECT<br />

VOLTAGE AT RELAY<br />

TEST TERMINALS<br />

(SEE WIRING DIAGRAM)<br />

YES<br />

OK?<br />

NO<br />

DOES<br />

RELAY HAVE<br />

SUPRESSOR UNIT?<br />

NO<br />

CHECK BOOK OF<br />

PLANS FOR<br />

RELAY LOGIC<br />

CIRCUITRY<br />

YES<br />

REPLACE SUPPRESSOR<br />

UNIT AND CHECK<br />

THAT RELAY PICKS UP<br />

YES<br />

OK?<br />

NO<br />

FAULT<br />

CORRECTED<br />

CHECK FOR CORRECT<br />

VOLTAGE AT RELAY<br />

COIL TERMINALS<br />

(I.E. 3D, 3C, 3B, 3A, SEE<br />

WIRING DIAGRAM))<br />

YES<br />

OK?<br />

NO<br />

REPLACE<br />

RELAY<br />

REPAIR RELAY<br />

PLUGBOARD<br />

WIRING<br />

Figure 5–1. DC Relay Does Not Pick<br />

P1457, Rev. Nov/07 5–4 <strong>Alstom</strong> Signaling Inc.

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