Chapter Installation and Wiring
2-6
2
Figure 2.11 shows a typical connection diagram for use with a shunt trip circuit
breaker. In this scheme, the electromechanical contactor is eliminated. The shunt
trip circuit breaker provides automatic isolation from the main power lines during
abnormal conditions and can also be used to provide a manual isolation from the
main power lines.
Figure 2.11 - Typical Connection Diagram with Shunt Trip Circuit Breaker
10 20 30 40 50 60 70 80 90
L1/1
L2/3
L3/5
T1/2
T2/4
T3/6
11 12 13 14
M
CR
TR
TR ➀
ST
AB
N.O.T.C
.
N.O.T.C.
11 12 13 14
SMC PLUS Control Terminals
Optional
220/240 VAC Fan Power
Jumper
To Supply
Stop ➀
Start ➀
SMC PLUS
Controller
Overload
Relay
O.L. ➀
Fast-Acting SCR
fuses (optional) ➀
Fan Power
(97A and
135A Only) ➁
O.L.
Auxiliary
Contacts
➃
Jumpers
Branch
Protection
➀
Power Input
3-Phase
➀
➀
➀
➀
➀
➀
CR ➀
➀
Shunt Trip
Circuit
Breaker ➀
CR ➀
TR ➀
Shunt
Trip Coil ➀
➀ Customer Supplied
➁ Customer wires fan to control voltage supply.
Jumpers are arranged for 110/120 VAC fan
power.
➂ For two wire control, remove stop/start push
buttons and connect two wire device between
points A and B.
➃ Set auxiliary contact for normal setting.
When using solid-state devices to operate the SMC PLUS controller the voltage
and frequency range will be 100–240V, 50/60 Hz. The OFF state leakage current
from the solid-state device must be less than 6 mA. The nominal input current is
25mA at 120 VAC and 50 mA at 240 VAC.
Figure 2.12 - Typical Connection with 2-Wire Control Scheme
10 20 30 40 50 60 70 80 90
11 12 13 14
L1/1
L2/3
L3/5
T1/2
T2/4
T3/6
M
11 12 13 14
SMC PLUS Control Terminals
Optional
220/240 VAC Fan Power
Jumper
To Supply
SMC PLUS
Controller
Overload
Relay
O.L. ➀
Fast-Acting SCR
fuses
(optional) ➀
Fan Power
(97A and
135A Only) ➁
Auxiliary
Contacts
Jumpers
Branch
Protection
➀
Power Input
3-Phase
➀
O.L. ➀
➀
➀
➀
Two-wire device ➀
➀ Customer Supplied
➁ Customer wires fan to control voltage
supply. Jumpers are arranged for
110/120 VAC fan power.
Typical Connection
with Shunt Trip
Circuit Breaker
Programmable
Controller and
Sensor Interface
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