Rockwell-automation MD65 User Manual Version 2.0 Manual de usuario descargar pdf (Pagina 172)

I-4

MD65 AC Drive User Manual

PID Feedback Sel (A133) is used to select the source of the PID

feedback.

Table I.2 – PID Feedback Sel (A133) Options

Analog PID Reference Signals

Parameters Anlg ln 0-10V Lo (A110) and Anlg ln 0-10V Hi (A111)

are used to scale or invert an analog PID Reference.

Important: Firmware version FRN 1.xx does not support

PID Feedback scaling from an analog input.

Examples

Scale Function

For a 0-5 volt signal, the following parameter settings are used so

that a 0 volt signal = 0% PID Reference and a 5 volt signal = 100%

PID Reference.

• Angl ln 0-10V Lo (A110) = 0.0%

• Angl ln 0-10V Hi (A111) = 50.0%

• PID Ref Sel (A132) = 0 “0-10V Input”

Option Description

0 “0-10V Input” Selects the 0-10V Input (default setting). Note that the PID will

not function with a bipolar analog input. It will ignore any

negative voltages and treat them like a zero.

1 “4-20mA Input“ Selects the 4-20mA Input.

2 “Comm Port” The reference word from a communication network such as

Modbus RTU or DeviceNet becomes the PID Feedback. The

value sent over the network is scaled so that P035 [Maximum

Freq] x 10 = 100% Feedback. For example, with [Maximum

Freq] = 60 Hz, a value of 600 sent over the network would

represent 100% Feedback.

0102030405060708090100

PID Reference (%)

Input Volts

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 185 186

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Rockwell-automation MD65 User Manual Version 2.0 Manual de usuario Pagina 172