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Rockwell Automation Publication 150-QS003D-EN-P - November 2013 29
Installation Chapter 2
Figure 19 - Wiring Diagram using 825 Converter Module and 150-SM2 Devices
with Bypass Contactor
➊ Customer supplied.
➋ Due to current leakage through an SCR in the OFF state (controller stopped), some form of upstream line power isolation is recommended if maintenance
is required on the motor. See the Isolation Contactor Applications for details.
➌ In Bypass Contactor RUN operation, the 825-MCM and the 150-SM2 module provide current-based protective feedback features including overload. Only
the cable provided with the 825-MCM converter can be used in this configuration. The maximum cable length is 4 m, thus the 825-MCM must be located
within 4 m of the SMC-50.
➍ The order of the terminal numbers for the 150-SM2 module can be reversed depending on which expansion slot it is located in the control module.
However, the function associated with the terminal number remains the same.
➎ Bypass must be controlled by an auxiliary contact of SMC-50 configured to external bypass.
➏ In North America, size the bypass contactor per the motor Hp and FLA. In IEC, size the bypass contactor per the motor AC-1 rating. The short-circuit rating
of the bypass contactor must be similar to that of the SMC-50.
NOTE: In addition to a small amount of leakage current flowing through an SCR in the off-state, failure of one or more solid-state power switching
components allows uncontrolled current to flow to the winding(s) of the motor. This could potentially result in overheating or damage to the motor. To
prevent potential personal injury or equipment damage, the installation of an isolation contactor or shunt trip-type circuit breaker capable of interrupting
the motor’s locked rotor current on the line side of the SMC-50 is recommended. Operation of the isolation device should be coordinated using one of
the SMC-50 auxiliary contacts configured to NORMAL.
T1/2
T2/4
T3/6
L1/1
L2/3
L3/5
SMC-50
3-Phase AC
Line Power
Fast-Acting SCR
Fuses (optional)
Circuit
Protective
Device
825-MCM
Bypass Contactor (BC)
150-SM2 Option Module
TB2
TB2
TB3
TB4
TB3
TB4
RG25U
Female
RG25U
Male
M
1
1
1
1
2
3
5
3
4
6