Siemens CU240B-2 - Two-Wire Control, Method 3

Advanced commissioning
6.2 Inverter control
Converter with the CU240B-2 and CU240E-2 Control Units
188 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
6.2.6
Two-wire control, method 3
You switch the motor on and off using a control command (ON/OFF1) and at the same time
select clockwise motor rotation. You also use the other control command to switch the motor
on and off, but in this case you select counter-clockwise rotation for the motor.
Unlike method 2, the inverter will accept the control commands at any time, regardless of the
motor speed.
Image 6-8 Two-wire control, method 3
Table 6- 9 Function table
ON/OFF1 clockwise
rotation
ON/OFF1 counter-
clockwise rotation
Function
0
0
OFF1: The motor stops.
1
0
ON: Clockwise motor rotation.
0
1
ON: Counter-clockwise motor rotation.
1
1
OFF1: The motor stops.
Parameter
Description
p0015 = 18
Macro drive unit
Controlling the motor using
the digital inputs of the
inverter:
DI 0
DI 1
ON/OFF1 clockwise
rotation
ON/OFF1 counter-
clockwise rotation
Advanced setting
Interconnecting control commands with digital inputs of your choice.
p3330[0 … n] = 722.x
BI: 2/3 wire control command 1
(ON/OFF1 clockwise rotation)
p3331[0 … n] = 722.x
BI: 2/3 wire control command 2
(ON/OFF1 counter-clockwise rotation)
Example: p3331[0] = 722.0 ⇒ if CDS 0 (index[0]) is selected, the inverter
receives its ON/OFF1 counter-clockwise command via DI 0.