3-12 Wiring
Control Terminal Designations As shown in Figure 3.10, the SMC-Flex controller contains 24 control
terminals on the front of the controller.
Figure 3.10 SMC-Flex Controller Control Terminals
➀
RC Snubbers are required on loads connected to auxiliary.
➁ Do not connect any additional loads to these terminals. These “parasitic” loads may cause problems
with operation, which may result in false starting and stopping.
➂ External Bypass operates an external contactor and overload relay once the motor reaches full
speed. The SMC-FLEX overload functionality, diagnostics and metering are disabled when the
external bypass is activated. Proper sizing of the contactor and overload is required.
➃ Control power on units rated 625…1250 A is pre-wired internally, from terminal block CP1.
Terminal
Number
Description
Terminal
Number
Description
11 Control Power Input ➀➃ 23 PTC Input ➁
12 Control Power Common ➀➃ 24 PTC Input ➁
13 Controller Enable Input ➁ 25 Tach Input
14 Control Module Ground 26 Tach Input
15 Option Input #2
➀➁ 27 Ground Fault Transformer Input ➁
16 Option Input #1 ➀➁ 28 Ground Fault Transformer Input ➁
17 Start Input ➀➁ 29 Aux. Contact #2➀➂
18 Stop Input ➀➁ 30 Aux. Contact #2➀➂
19 Aux. Contact #1➀➂ 31 Aux. Contact #3➀➂
20 Aux. Contact #1➀➂ 32 Aux. Contact #3➀➂
21 Not Used 33 Aux. Contact #4➀➂
22 Not Used 34 Aux. Contact #4➀➂
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