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Type B Vital Relays - Alstom

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Troubleshooting<br />

DC RELAY DOES<br />

NOT RELEASE<br />

CHECK FOR VOLTAGE<br />

PRESENT AT RELAY<br />

TEST TERMINALS<br />

(SEE WIRING DIAGRAM)<br />

YES<br />

OK?<br />

NO<br />

REFER TO<br />

BOOK OF PLANS<br />

FOR RELAY<br />

LOGIC<br />

CIRCUITRY<br />

REPLACE<br />

RELAY<br />

Figure 5–2. DC Relay Does Not Release<br />

NOTE<br />

Failure of a DC Relay to release with no voltage applied to the terminals<br />

could indicate a potential safety failure. Record the conditions and notify<br />

<strong>Alstom</strong> Signaling customer service as soon as possible.<br />

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

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