Guardian 5240 - Utility Source Voltage Available

NEUTRAL
CONNECTION
INSIDE SWITCH
XB
NO
C1
COM
XA
VR1
NC NC
COM
C2
VR2
NO
TR
194
23
1
7
4
79
36
9
F2
CIRCUIT 10
BLACK (MAIN 1)
12VDC TRANSER
COIL
RED (MAIN 2)
NEUTRAL (WHITE)
NEUTRAL (WHITE)
23
OPEN
F1
N2
N1
194
23
BLACK
RED
N2
N1
194
240VAC TO
TO GENERATOR
OUTPUT
PANEL
MAIN DISTRIBUTION
LC-CIRCUIT BREAKER (LOADS)
F1,F2-5A, 600V FUSE
XA,XB-LIMIT SWITCHES
TS-TERMINAL STRIP
TR-TRANSFER RELAY
C2-GENERATOR COIL & RECTIFIER
LEGEND
C1-UTILITY COIL & RECTIFIER
T1
T2
T1 T2
E2
E2
E2
E2
E1
E1
N1A
N1A
N2A
N2A
B
B
B
B
B
E1
E1
E1
N1AN1A
N1A
194
23
E1
E2
205
205
126
126
E2
N1A
N2A
N2A
A
N2A
240VAC
OUTPUT
GENERATOR
TS TO
CONTROL PANEL
CIRCUIT BREAKER
A
B
AT S
ATS-AUTOMATIC TRANSFER SWITCH
LC
CIRCUIT 9
CIRCUIT 6
CIRCUIT 5
CIRCUIT 2
CIRCUIT 1
CIRCUIT 3
CIRCUIT 4
CIRCUIT 7
CIRCUIT 8
CIRCUIT 11
CIRCUIT 12
CIRCUIT 13
CIRCUIT 14
CIRCUIT 16
CIRCUIT 15
16 CIRCUIT LOAD CENTER 12 CIRCUIT LOAD CENTER 10 CIRCUIT LOAD CENTER
8 CIRCUIT LOAD CENTER
UTILITY
GENERATOR
GROUND
DC
PART 3
UTILITY SOURCE VOLTAGE AVAILABLE
Figure 3 is a schematic representation of the transfer switch with utility source power available. The circuit condi-
tion may be briefly described as follows:
• Utility source voltage is available to terminal lugs N1 and N2 of the transfer mechanism, transfer switch is in the
UTILITY position and source voltage is available to T1, T2 and customer load.
• Utility source voltage is available to limit switch (XA1) via the normally-closed transfer relay contacts (1 and 7)
and Wire 126. However, XA1 is open and the Circuit to the utility closing coil is open.
• Utility voltage “sensing” signals are delivered to a circuit board on the generator, via Wire N1A, a 5 amp fuse
(F1), transfer switch Terminal N1, generator Terminal N1 and a sensing transformer. The second line of the util
-
ity voltage “sensing” circuit is via Wire N2A, a 5 amp Fuse (F2), transfer switch Terminal N2, generator Terminal
N2, and the sensing transformer.
Page 56
“V-TYPE” PREPACKAGED
TRANSFER SWITCHES
SECTION 3.2
OPERATIONAL ANALYSIS
Figure 3. Utility Source Power Available