Type B Vital Relays - Alstom

Installation
Table 3–5. AC Microchron II Timer Relay Installation Procedure (Cont.)
Step
Procedure
8 When setting the time, use the standard representation.
Tens
Minutes
Unit
Minutes
Tens
Seconds
Unit
Seconds
Tenth of
Seconds
1 9 5 9 9
This example shows a setting of 19 minutes and 59.9 seconds. A time set at
89.9 seconds would read 01:29.9.
9 Energize the timer and verify the elapsed time with an external timing device
from the instant energy is applied until the relay front contacts close.
A red LED illuminates when power is first applied; it blinks until the delay set on
the switches has expired.
Then, a green LED illuminates to indicate that the delay has expired.
The operational relay timing must be within ±0.1% of the time pre-selected by
the thumbwheel switches plus a maximum delay of 0.75 seconds.
If the timing is not within acceptable limits, remove and replace the relay.
Then perform the mechanical and electrical tests provided in Section 6,
Corrective Maintenance, on the malfunctioning relay.
10 Reseal access to the thumbwheel switches by sliding the clear plastic cover
over the two studs and securing it in place with the two thumbnuts. Install a new
tamper evident lead seal (P/N 35285-000-00), using the holes in the studs, and
crimp securely.
11 Verify the time setting.
P1457, Rev. Nov/07 3–15 Alstom Signaling Inc.