Allen-Bradley SMC-50 - Typical Control Wiring Examples

Rockwell Automation Publication 150-QS003E-EN-P - April 2017 15
Installation Chapter 1
Typical Control Wiring Examples
Figure 6 and Figure 7 are control wiring diagram examples using the controller
standard I/O. For additional wiring examples, see the SMC-50 controller user
manual, publication 150-UM011
.
Figure 6 - Two-wire Control (No DPI) with Fault Indication
(1) Customer supplied.
(2) See the controller nameplate to verify the control power input ratings (120V/240V AC or 24V DC).
(3) Terminal 10 (IN2) 24V DC normally open (N.O.) input is configured for Start/Stop or Start/Coast using
Parameter 57. When using the Start/Stop or Start/Coast, the N.O. contact must be used.
NOTE: The controller generates an I/O configuration fault if any input is configured for START or SLOW speed and no input is
configured for COAST or STOP.
(4) A customer-supplied jumper is required to enable the controller’s standard I/O operation.
(5) The terminal must be wired to the control ground to maintain reliable operation.
(6) The Aux2 output contact is configured for Fault using Parameter 176.
NOTE: 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 typical wiring diagram for Isolation Contactor Application in the
user manual.
TIP When you are using two-wire control with IN1 and/or IN2 set for either
Start/Stop or Start/Coast, you cannot start the SMC-50 controller via a HIM.
If you want to start and stop the motor in test mode via a HIM, use the
following steps:
• Set IN1 (Parameter 56) and IN2 (Parameter 57) to “Disable”.
• Clear the I/O Config Fault, if it appears.
• Set the Logic Mask (Parameter 148) to the appropriate bit, based on
which device port the HIM is using.
Motor should now start and coast via HIM commands.
-L2
+L1
-L2 +L1
-L2 +L1
12
11
10 9
8
7
65
4
32
1
Intl +24V DC
In1 DC In2 DC
Enable I/O
Intl DC Common
Aux 2
Aux 1
Control
Ground
Control Power
Start/Stop
Indication LED
(3)
(1)
(4)
(1)
(6)
(5)
(2)