Installing/Mounting
4.2 Connecting a CU240S via Terminals
Control Units CU240S
34
Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
AI0 and AI1 used as current inputs
To use it as current inputs the following must be performed:
1.
DIP switch settings:
Set the analog input dip switches to ON-position (DIP switch 1 refers to AI0, DIP switch
2 refers to AI1)
2.
Paramter settings
Example, using analog input as monitored current input
Parameter
Description
P0003 = 3
User access level*
3: Expert: For expert use only
P1000[0] = 2 Selection of frequency setpoint*
2: Analog setpoint (Default setting)
Switch over from voltage to current input
P0756[0] = 3 Type of AI0 (P0756[1] for AI1)
Sets analog input 0 (AI0) to "Unipolar current input with monitoring (0 to 20 mA)"
Scaling the analog inputs
P0757[0] = 4 Value x1 of AI0 scaling (P0757[1] = for AI1)
Sets analog input 0 (AI0) to a minimum of 4 mA.
P0758[0] = 0 Value y1 of AI0 scaling (P0758 [1] = for AI1)
Sets the y scaling of the analog input at 4mA to 0 %.
P0761[0] = 4 Width of AI0 dead band (P0761 [1] = for AI1)
Sets the dead band width of analog input 0 (AI0).
The figure shows the control wiring to use the
analog inputs as current inputs for both, frequency
setpoint and an additional setpoint, for example
from a PLC.
&8
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