Onan MJA Series Service Manual page 127

125
CONTROL SYSTEM
For disassembly and repair of
the timing gear and switch op ­
erating mechanism, see Sect.
3.3.
6. 3 . 1.4 starting Solenoid
(#307B40). - This solenoid
is the same as that described
in Sect. 6. 2. 1.
1.
6. 3.2 BATTERY CHARGING
CIRCUIT. - This circuit in­
cludes the adjustable charge
resistor, j:ectifier, and am ­
meter.
It
converts ac current
CENTRIFUGAL
SWITCH
BREAKER POINTS
Set gap at
.020"
supplied by the generator
FIG 6. E - ADJUSTING CENTRIFUGAL
charging winding to dc and de­ SWITCH GAP
livers it through the ammeter
to the battery. The normal
charge rate is about 2 amps and the maximum 5 amps. If any current
drawing accessories such as electric fuel pumps are installed, their
current draw must be subtracted from the maximum battery charging
current and also for the charge rate registered on the plant ammeter.
To adjust the charge rate, move the tap on the adjustable resistor in
the generator air outlet.
WARNING: Connecting battery with the wrong polarity will damage the
charging circuit within a minute or two. If the adjustable
charge resistor is eliminated or shorted, both the circuit
and the generator charging winding will be damaged
in
a
few seconds
of
operation.
For information about the generator charging Winding, see Sect 4.3.4.1.
6.3.2.1 Rectifier (#305-235).- The
rectifier 'converts the aC,producedby
the generator charging winding to dc
and also acts asa reverse current
relay. Incorrect battery polarity can
.',t.
destroy the rectifier. If the battery
polarity is to be changed, reverse
the battery polarity reconnection
block in the control box.
NOTE: If you aren't sure which bat ­
tery polarity to uSe, check
this block before connecting
the batteries.
TO REVERSE DISCONNECT
WIRES FROM TERMINALS, TURN
THIS BLOCK BOTTOM SIDE UP
AND RECONNECT WIRES.
FIG 6. F - POLARITY. RECONNEC­
TION BLOCK - IN CONTROL BOX