Siemens SINAMICS G120 Operations Instructions Page 156

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Functions
7.2 Inverter control
Inverter with CU240B-2 and CU240E-2 Control Units
154 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB
7.2.5 Three-wire control, method 2
With one control command, you enable the two other control commands. You switch the
motor off by canceling the enable (OFF1).
You switch on the motor with the positive edge of the second control command (ON).
The third control command defines the motor's direction of rotation (reversing).
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Figure 7-6 Three-wire control, method 2
Table 7- 10 Function table
Enable/OFF1 ON Reversing Function
0 0 or 1 0 or 1 OFF1: The motor stops.
1 0→1 0 ON: Clockwise rotation of motor.
1 0→1 1 ON: Counter-clockwise rotation of motor.
Table 7- 11 Parameter
Parameter Description
Macro drive unit
DI 0 DI 1 DI 2
p0015 = 20
Controlling the motor using
the digital inputs of the
inverter:
Enable/OFF1 ON Reversing
Advanced setting
Interconnecting control commands with digital inputs of your choice (DI x).
p3330[0 … n] = 722.x BI: 2-3-WIRE Control Command 1 (enable/OFF1)
p3331[0 … n] = 722.x BI: 2-3-WIRE Control Command 2 (ON)
p3332[0 … n] = 722.x BI: 2-3-WIRE Control Command 3 (reversing)
Example
p3331 = 722.0 DI 0: ON.
Also see Section Digital inputs (Page 90).
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