TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
instantly on LR relays, by verifying
ohmmeter indication.
(3) Check that normally open contacts close
and normally closed contacts open after a
time delay of . 2-20 seconds on LRTD
relays. The LRTD relays are adjustable
from . 2-20 seconds.
NOTE
The LRTD relays are designed for
horizontal mounting. When testing, it
must be placed in this position to
operate properly.
b. Replacement. Relays (15, 13, figure 15-9) are
removed
and
replaced
as
follows:
(1)
Disconnect and tag wires to relays.
(2) Remove two screws and two washers.
Remove relay from panel (7).
(3) Replace relay (15) by attaching to panel
(7) using two screws and washers.
Connect wires and remove tags.
15-22. TIME DELAY RELAY. (SDT) (12, figure 15-9) is a
delay on a drop-out type relay set for 5 minute delay. The
relay is adjustable within 1-300 seconds and allows the
engines to cool down after load has been removed.
a. Test.
(1) Connect a 24V DC supply to L1(-) and
L2(+) as shown in figure 15-15.
(2) With ohmmeter across terminals 5 and 3
note that resistance reading does not
change until 5 minutes after power has
been applied.
b. Replacement. Remove and replace time delay
relay (12) as follows:
(1) Disconnect and tag wires connected to
relay.
(2) Remove four screws and washers.
Remove relay from panel (7).
(3) Replace relay (12) by attaching to panel
(7) with four screws and washers.
Connect wires and remove tags.
15-23. TIME DELAY RELAY. (UTR) (17, figure 15-9) is a
time delay on energize type relay set for 5 minutes delay.
The relay is adjustable within 3-30 minutes and prohibits
load to be transferred back to utility power until timed out.
a. Test.
(1) Connect the relay as shown in figure 15-
12.
(2) Close switch S1. The lamp DS1 will not
light until the relay has timed out (5
minutes).
b. Replacement. Remove and replace relay (17)
as follows:
(1) Disconnect and tag wires to relay.
(2) Remove four screws and washers.
Remove relay from panel (7).
(3) Replace relay (17) by attaching to panel
(7) with four screws and washers.
Connect
wires
and
remove
tags.
15-18
