Operating instructions

Functions
7.4 Setpoint sources
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
195
7.4 Setpoint sources
The setpoint source is the interface via which the inverter receives its setpoint. The following
options are available:
● Motorized potentiometer simulated in the inverter.
● Inverter analog input.
● Setpoints saved in the inverter:
– Fixed setpoints
– Jog
● Inverter fieldbus interface.
Depending on the parameterization, the setpoint in the inverter has one of the following
meanings:
● Speed setpoint for the motor.
● Torque setpoint for the motor.
● Setpoint for a process variable.
The inverter receives a setpoint for a process variable, e.g. the level of liquid in a
container, and calculates its speed setpoint using the internal technology controller.
7.4.1 Analog input as setpoint source
If you use an analog input as setpoint source, then you must adapt this analog input to the
type of connected signal (± 10 V, 4 … 20 mA, …). Additional information is available in
Section Analog inputs (Page 89).
Procedure
You have two options for interconnecting the setpoint source with an analog input:
1. Using p0015, select a configuration that is suitable for your application.
Please refer to the section titled Selecting the interface assignm
ents (Page 48) to find out
which configurations are available for your inverter.
2. Interconnect main setpoint p1070 with an analog input of your choice.
Table 7- 15 Analog inputs as setpoint source
Parameter Setpoint source
r0755[0] Analog input 0
r0755[1] Analog input 1
Example: You interconnect analog input 0 as the setpoint source with p1070 = 755[0].