Relays and Resistors
Testing (Model MEP-018A ).
Make an operational check of the
relays (see fig. 4-68), start the
generator set in the local
and normal starting position, noting the oil pressure and
ammeter for proper indication.
Place the start/stop switch (S1) in
the stop position. Engine should
Start the generator set in the local
Switch the generator set in the
local and normal starting position.
Switch (S2) from normal run
position and place the start/stop
switch (S1) to the stop position.
The generator set should continue
to run. Stop the generator set by
placing emergency switch (S2) to
the emergency stop position.
After the set stops, place (S2)
back to the emergency
position and attempt to restart the
set. The engine should not start
with the electrical starter, but
should be capable of manual
emergency switch (S2) to normal
components as noted in (4) and
Test silicon diode CRI. Continuity
must be indicated in one direction
Refer to diagram on top of relay.
Check continuity through the coil
and the normally closed contacts.
Coil resistance is 300 ohms.
Energize the coil with 20-24 volts
DC and check that normally open
contacts have closed. Relays are
sealed and cannot be repaired.
Change 2 4-78