Type B Vital Relays - Alstom

Troubleshooting
MICROCHRON II
TIMER RELAY DOES
NOT RELEASE
NO
IS RED LED
ILLUMINATED?
YES
CHECK FOR VOLTAGE
PRESENT AT RELAY
TEST TERMINALS
(SEE WIRING DIAGRAM)
NO
OK?
YES
REPLACE
RELAY
REFER TO BOOK OF
PLANS FOR
RELAY LOGIC
CIRCUITRY
Figure 5–6. Microchron II Timer Relay (AC or DC) Does Not Release
NOTE
Failure of a Microchron II Timer Relay to release with no voltage applied to
the terminals could indicate a potential safety failure. Record the
conditions and notify Alstom Signaling customer service as soon as
possible.
P1457, Rev. Nov/07 5–10 Alstom Signaling Inc.