Siemens CU240S DP Operations Instructions download pdf (Page 16)

Installing/Mounting

1.1 Fitting the CU to the PM

Control Units CU240S

1-8 Operating Instructions (Compact), 04/2006, A5E00766042B AA

1.2.5 Current input control wiring

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 switch is used to configure the analog inputs (AI). Use DIP switches 1

and 2 to set the switches to the ON 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.

1 ... 15 16 17 ... 110

No comments

Siemens CU240S DP Operations Instructions Page 16