Rockwell-automation MD65 User Manual Version 2.0 Uživatelský manuál stáhnout pdf (Strana 173)

PID Set Up

I-5

Invert Function

For a 4-20mA signal, the following parameter settings are used so

that a 20mA signal = 0% PID Reference and a 4mA signal = 100%

PID Reference.

• Angl ln 4-20mA Lo (A112) = 100.0%

• Anlg In 4-20mA Hi (A113) = 0.0%

• PID Ref Sel (A132) = 3 “4-20mA Input”

PID Deadband

Parameter A138 [PID Deadband] is used to set a range, in percent,

of the PID Reference that the drive will ignore.

Example

• [PID Deadband] is set to 5.0

• The PID Reference is 25.0%

• The PID Regulator will not act on a PID Error that falls between

20.0 and 30.0%

0102030405060708090100

PID Reference (%)

4-20mA Input

1 2 ... 168 169 170 171 172 173 174 175 176 177 178 ... 185 186

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Rockwell-automation MD65 User Manual Version 2.0 Uživatelský manuál Strana 173