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Type B Vital Relays - Alstom

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Troubleshooting<br />

AC VANE RELAY<br />

DOES NOT<br />

RELEASE<br />

VOLTAGE<br />

PRESENT<br />

BETWEEN<br />

TERMINALS 1E<br />

AND 6E<br />

YES<br />

RELAY OPERATION<br />

IS NORMAL;<br />

REFER TO BOOK OF<br />

PLANS FOR RELAY<br />

LOGIC CIRCUITRY<br />

NO<br />

REPLACE<br />

RELAY<br />

Figure 5–4. AC Vane Relay Does Not Release<br />

NOTE<br />

Failure of an AC 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 5–7 <strong>Alstom</strong> Signaling Inc.

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