Guardian 4389 Repair Manual page 91

DC CONTROL
• The hourmeter (if equipped) connected to Wire 14 will be opened and clock function of the hourmeter will stop.
• The battery charge relay (BCR) connected to Wire 14 will be de-energized. This will cause transformer (TX)
voltage to power the battery charger again.
• Circuit board action will connect the engine's ignition shutdown module (ISM) to ground, via Wire 18, circuit
board Pin 13, and Wire 0. Ignition will be terminated.
• Without fuel flow and without ignition, the engine will shut down.
11
22
TX
225A N2
56VA
224A
225
1VA
224 N1
+
-
0 0 12VDC ACCESSORY SOCKET
15B
13
13
0 0
F2
15B
0
15A
17
23
194
13
0
239
14
0
15
17 15 SCR
56
18
0
0 0
17
15
0 0
18
C1-5
PART 4
C2-6
C2-5
N2
N1
17
F1
15
15
15 15A
15 15
15
23
194
239
14
15
13
C2-1
16 16
14
C1-1
SC FS
0 0
0
G
IM1
D
SP1
18
IM2
D
SP2
194 23 11 22
22
SW1
239
N
11
RED
SC
BATTERY
SM
12V
BLACK
CUSTOMER
SUPPLIED
G G
Figure 7. Circuit Condition - Retransfer to "Utility" and
SECTION 4.2
OPERATIONAL ANALYSIS
240VAC
N1
UTILITY
N2 INPUT
12Vdc
23
TRANSFER
RELAY
194
COIL
22
N
33
120V
POWER
120V
WINDING
(STATOR)
44
CB1
11
11
N N
240V
CB3
L
N L
G G
EXTERNAL
GFCI
OUTLET
Engine Shutdown
23
TR
194
CUSTOMER
CONNECTIONS
Page 89