WEG CFW-11 Programming Manual page 163

P0246 – ai4 Signal function
Adjustable 0 = Speed Reference
Range: 1 = No Ramp Reference
2 = Maximum Torque Current
3 = Process Variable
4 = Not Used
5 = Not Used
6 = Not Used
7 = PLC Use
Proprieties: CFG
Access groups 07 I/O CONFIGURATION
via HMI:
Description:
The functions of the analog inputs are defined in those parameters.
When the option 0 (Speed Reference) is selected, the analog inputs are able to supply the reference for the motor,
subject to the specified limits (P0133 and P0134) and to the ramp action (P0100 to P0103). Therefore, it is also
necessary to configure the parameters P0221 and/or P0222, selecting the use of the desired analog input (For more
details refer to the description of those parameters in the section 13.3 and to the figure 13.8 in this manual).
The option 1 (No Ramp Reference – valid only for the vector mode) is used generally as an additional
reference signal, for instance in applications using a dancer (Refer to the figure 13.8, option without acceleration
and deceleration ramp).
The option 2 (Maximum Torque Current) makes it possible that the forward and reverse torque current limit
control be done by means of the selected analog input. In this case P0169 and P0170 are not used.
The adjustment done at the analog input AI1, AI2, AI3 or AI4 can be monitored via parameters P0018, P0019,
P0020 or P0021 respectively, The value presented at this parameter will be the maximum torque current expressed
as a percentage of the motor rated current (P0401). The indication range will be from 0 to 200 %. When the analog
input is equal to 10 V (maximum), the corresponding monitoring parameter will show 200 %, and the value of the
maximum forward and reverse torque current will be 200 %.
In order that the expressions which determine the total current and the maximum torque developed by the motor
(sections 11.5 and 11.8.6) remain valid, replace P0169, P0170 by P0018 to P0021.
The option 3 (Process Variable) defines the analog input as the PID Regulator feedback signal (E.g.: pressure sensor,
temperature, etc.). Therefore it is also necessary to configure the parameter P0524 (PID Feedback Selection).
When the analog input is at its maximum limit (P0018 to P0021 indicating 100 %), the process variable will also
be at the maximum value (100 %).
The option 4 (PTC – not available for the AI4 input) configures the input for motor temperature monitoring
by means of a PTC type sensor, when it is present in the motor. Therefore it is also necessary to configure one
analog output (AO) as a current source for feeding the PTC. More details of this function are described in the
section 15.2 – Motor Overtemperature Protection.
The option 7 (PLC use) configures the signal at the input to be used by the PLC11 board.
P0232 – ai1 Gain
P0237 – ai2 Gain
38 Analog Inputs
Digital and Analog Inputs and Outputs
Factory
Setting:
or 01 PARAMETER GROUPS
38 Analog Inputs
0
13
13-3