Rockwell-automation MD65 User Manual Version 2.0 Manual de usuario descargar pdf (Pagina 171)

PID Set Up

I-3

• As tension increases or decreases during winding, the Speed

Reference is trimmed to compensate. Tension is maintained

near the Equilibrium set point.

PID Reference and Feedback

PID Ref Sel (A132) is used to enable the PID mode (A132 does not

equal 0; “PID Disabled”) and to select the source of the PID

Reference. If PID Ref Sel (A132) is not set to 0 “PID Disabled”, PID

can still be disabled by select programmable digital input options

(parameters A051-A054) such as “Jog”, “Local” or “PID Disable”.

Table I.1 – PID Ref Sel (A132) Options

eed Reference

0 Volts

PID Feedback =

Dancer Pot Signal

10 Volts

PID Reference =

Equilibrium Set Point

Option Description

0 “PID Disabled” Disables the PID loop (default setting)

1 “PID Setpoint“ Selects Exclusive Control. A137 [PID Setpoint] will be used to set the value of

the PID Reference

2 “0-10V Input” Selects Exclusive Control. Selects the 0-10V Input. Note that the PID will not

function with a bipolar analog input. It will ignore any negative voltages and treat

them like a zero.

3 “4-20mA Input” Selects Exclusive Control. Selects the 4-20mA Input.

4 “Comm Port” Selects Exclusive Control. The reference word from a communication network

such as Modbus RTU or DeviceNet becomes the PID Reference. The value

sent over the network is scaled so that P035 [Maximum Freq] x 10 = 100%

reference. For example, with [Maximum Freq] = 60 Hz, a value of 600 sent over

the network would represent 100% reference.

5 “Setpnt, Trim” Selects Trim Control. A137 [PID Setpoint] will be used to set the value of the

PID Reference.

6 “0-10V, Trim” Selects Trim Control. Selects the 0-10V Input. Note that the PID will not function

with a bipolar analog input. It will ignore any negative voltages and treat them

like a zero.

7 “4-20mA, Trim” Selects Trim Control. Selects the 4-20mA Input.

8 “Comm, Trim” Selects Trim Control. The reference word from a communication network such

as Modbus RTU or DeviceNet becomes the PID Reference. The value sent over

the network is scaled so that P035 [Maximum Freq] x 10 = 100% reference. For

example, with [Maximum Freq] = 60 Hz, a value of 600 sent over the network

would represent 100% reference.

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Rockwell-automation MD65 User Manual Version 2.0 Manual de usuario Pagina 171

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