Utility Source Voltage Failure - Generac Power Systems 10 kW LP Repair Manual

TRANSFER SWITCH
If utility source voltage should drop below a preset value, the generator circuit board will sense the dropout. The
circuit board will then initiate generator cranking and startup after a time delay circuit times out.
Figure 4 is a schematic representation of the transfer switch with generator power available, waiting to transfer.
• Generator voltage available E1, E2.
• Circuit board action holding Wire 23 open to ground.
• Power available to standby coil C2, upon closure of TR1, normally open contacts (9 & 6) will close and initiate a
transfer.
E1
N1A
-
+
BLK
RED
WIRE
WIRE
BC
B
B
N2A
A
LEGEND
BC-BATTERY CHARGER
C1-UTILITY COIL & RECTIFIER
C2-GENERATOR COIL & RECTIFIER
F1,F2,F3-5A, 600V FUSE
LC-CIRCUIT BREAKER (LOADS)
(16 CIRCUIT SHOWN FOR REFERENCE ONLY)
N-NEUTRAL
SW1-AUTOMATIC TRANSFER SWITCH
SW2,SW3-LIMIT SWITCHES
TB1-TERMINAL STRIP
TR1-TRANSFER RELAY
Part 3

utility Source VoltaGe Failure

15B
E1
N1A
A
7 7 9 9
TR1
1 4 3 6
B
23
126 205
N2A
N1A
N1A
N2A
205
B
N1A
126
N2A
NO NC NC NO
SW3
SW2
COM COM
VR1 VR2
C1 C2
T1 T1 T2
SW1
N2A
B E2
F3
T1
B E2
Figure 4. Generator Power Available, Waiting to Transfer.
0
15B 15B
23 23
F2
N2
F1
N1A
E1
E2
E1
E2
NEUTRAL
CONNECTION
INSIDE
SWITCH
E1
CIRCUIT 14
E2
E2 CIRCUIT 13
CIRCUIT 10
CIRCUIT 9
CIRCUIT 6
CIRCUIT 5
CIRCUIT 2
T1 CIRCUIT 1
T2 CIRCUIT 3
CIRCUIT 4
CIRCUIT 7
CIRCUIT 8
CIRCUIT 11
CIRCUIT 12
CIRCUIT 15
CIRCUIT 16
UTILITY
LC
DC
GROUND
GENERATOR
sEctioN 3.2
oPEratioNal aNalYsis
0 0
CONTROL
15B
TRANSFER
23
N2
UTILITY
SENSING
240VAC
N1 N1 OUTPUT
E1 BLACK
TO GENERATOR
RED
OUTPUT
NEUTRAL (WHITE)
GROUND (GREEN)
GROUND (GREEN)
NEUTRAL (WHITE)
240VAC TO
RED (MAIN 2)
MAIN DISTRIBUTION
PANEL
BLACK (MAIN 1)
TS TO
GENERATOR
CONTROL PANEL
Page 63