Guardian 4389 Repair Manual page 85

DC CONTROL
• The "engine warm-up timer" will run for about 15 seconds. When this timer finishes timing, board action will ini-
tiate transfer to the STANDBY power source. As shown in Figure 4 (above), the timer is still running and trans-
fer has not yet occurred.
• Generator AC output is available to transfer switch Terminal Lugs E1/E2 and to the normally open contacts of a
transfer relay. However, the transfer relay is de-energized and its contacts are open.
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 4. Circuit Condition - Engine Startup 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
23
TR
194
CUSTOMER
CONNECTIONS
Running
Page 83