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Type B Vital Relays - Alstom

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Installation<br />

Table 3–3. Microchron II Timer Relay (DC) Installation Procedure (Cont.)<br />

Step<br />

Procedure<br />

8 For a timer with a tamper evident color seal, remove the plastic seal. For a timer<br />

with a lead seal, remove seal, thumbnuts, and cover to expose the thumbwheel<br />

switches.<br />

GREEN LED<br />

RED LED<br />

THUMBWHEEL<br />

SWITCHES<br />

1 0 2 0<br />

TAMPER EVIDENT COLOR SEAL<br />

(P/N 37947-059-00, RED TINT)<br />

(P/N 37947-058-00, GREEN TINT)<br />

9 Adjust the thumbwheel switches to the desired timing interval.<br />

NOTE<br />

Certain switches contain “stops” and only rotate between<br />

allowable settings. For example, the “Tens of Minutes” switch can<br />

only rotate between the “0” and “1” positions and the “Tens of<br />

Seconds” switch can only rotate between the “0” and “5” positions.<br />

P1457, Rev. Nov/07 3–10 <strong>Alstom</strong> Signaling Inc.

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