Installing/Mounting
4.2 Connecting the Control Unit via terminals
Control Units CU240S
4-8 Operating Instructions, 11/2006, A5E00766042B AA
Frequency setpoint and an additional setpoint via terminals
AI0 and AI1 used as current inputs
This type of control wiring allows a main frequency setpoint and an additional setpoint to be
established, for example from a PLC.
The figure below shows the wiring that is necessary to accomplish this functionality.
DIP switch Settings
The general I/O DIP switches 1 and 2 are used to configure the analog inputs (AI). For using
AI0 and AI1 as voltage inputs set DIP switches 1 and 2 to OFF position. For detailed
information refer to "Analog input" in section "Function".
Parameter Settings
The following parameter need to be changed to the values given below. These changes
must only be made after the Quick Commissioning procedure has been completed.
To use 0 mA … 20 mA
● P0003 = 3 Sets the access level to Expert.
● P1000[0] = 22 Setpoint now expected from the analog inputs.
● P0756[0] = 2 Sets analog input 0 (AI0) to current input.
● P0756[1] = 2 Sets analog input 1 (AI1) to current input.
To use 4 mA … 20 mA
The following additional parameters need to be modified:
● P0757[0] = 4 Sets analog input 0 (AI0) to a minimum of 4 mA.
● P0761[0] = 4 Sets the deadband width of analog input 0 (AI0).
● P0757[1] = 4 Sets analog input 1 (AI1) to a minimum of 4 mA.
● P0761[1] = 4 Sets the deadband width of analog input 1 (AI1).
Note
Index [0] is analog input 0, Index [1] is analog input 1, if you are only using one analog
input then you only need to change those indices for the specific analog input.
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