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 ELECTRIC PROTECTIVE SYSTEM
TROUBLESHOOTING
PROCEDURE F
tage on terminal 1 for more than 60 seconds):
ON/OFF TIME DELAY (RELAY)
Terminals
Relay Position
5
Open
7
Closed
(b)
Remove positive (+) source voltage from
terminal 1. Use a stop watch and check the
time from the moment of removal to verify
chart that follows:
Terminals
Delay Time to Function
0 to 60 Secs. After 80 Secs.
5
Open
Closed
7
Closed
Open
3.
(a)
Apply positive (+) source voltage to terminal
2.
NOTE: If bench testing, Step 3 can be used with
ON/OFF TIME DELAY (RELAY)
either relay. When installed on engine, Step 3
Performance Check (either TD1 or TD2 relays
can only be checked with TD2. Do not apply
can be checked with methods that follow)
positive (+) voltage to terminal 2 of TD1, or a
A.
Items Required For Check:
direct short will result.
Check the time from the moment voltage is
1. Battery or any D.C. source of 8 to 40 volts.
applied to verify chart that follows (do not
2. Voltmeter (6V7070 Multimeter or one of same
leave voltage on terminal 2 for more than
accuracy).
60 seconds):
3. Stop watch.
B.
Bench Or Installed Test
Terminals
Delay Time to Function
0 to 8 Secs.
After 10 Secs.
Connect or verify source voltage to relay ter-
5
Closed
Open
minals 3 (-) and 4 (+) [if bench testing, also connect
7
Open
Closed
positive (+) voltage to relay terminal 6]. All connections
must be maintained until tests are complete.
(b)
Remove positive (+) source voltage from
NOTE: There will be voltage when the relay is closed.
terminal 2.
Check the time from the
When relay is open, there will be no voltage [voltage may
moment of removal to verify chart that
be positive (+) or negative (-) when relay is tested on
follows:
engine; when bench testing, voltage will always be
positive (+)].
Terminals
Delay Time to Function
0 to 60 Secs.
After 80 Secs.
1.
Use the voltmeter to verify chart that
5
Open
Closed
follows:
7
Closed
Open
Terminals
Relay Position
5
Closed
4.
Remove wire from terminal 4 and verify chart
7
Open
that follows:
2. (a)
Apply positive (+) source voltage to terminal I
Terminals
Relay Position
(either relay) and immediately verify the chart
5
Closed
that follows (do not leave vol-
7
Open
553
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