3-4 Wiring
Line Connected
The SMC-Flex by default is programmed to be connected to a line
controlled motor as shown in Figure 3.4. These motors typically have
3 leads and must be rated between 1…1250 amps. An optional
isolation contactor can be added to the circuit to provide galvanic
isolation of the motor and final electro-mechanical removal of power.
Figure 3.4
Delta Connected
The SMC Flex can be programmed and connected to a delta
controlled motor as shown in Figure 3.5. These motors typically have
6 or 12 leads and must be rated between 1.8…1600 amps. It is
recommended that an isolation contactor be added to the circuit to
provide galvanic isolation of the motor and final electro-mechanical
removal of power.
Figure 3.5
Failure of solid state power switching components can cause overheating due to a single-phase
condition in the motor. To prevent injury or equipment damage, the following is recommended:
Use of an isolation contactor or shunt trip type circuit breaker on the line side of the SMC. This
device should be capable of interrupting the motor’s lock rotor current.
Connection of this isolation device to an auxiliary contact on the SMC-Flex. The auxiliary contact
should be programmed for the “normal” condition. See Chapter 4 for additional information on
programming.
1/L1
3/L2
5/L3
2/T1
4/T2
6/T3
12/T6
8/T4
10/T5
M
3~
IC
IC
IC
SMC-Flex
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