Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 138)

PARAMETERS

125

(

)

Calibration example

(A detector of 4mA at 0

C (32

F) and 20mA at 50

C (122

F) is used to adjust the room temperature to 25

(77

F) under PID control. The set point is given to across inverter terminals 2-5 (0-5V).)

Yes

*When calibration is required, use Pr. 902 and Pr. 903 (terminal 2) or Pr. 904 and Pr. 905 (terminal 4)

to calibrate the detector output and set point setting input in the PU mode during an inverter stop.

START

Convert the set point into %

Calculate the ratio of the set

point to the detector output.

Calibrate

Set the set point.

Enter a voltage to across

terminals 2-5 according to

the set point (%).

Operation

Set the proportional band and

integral time to slightly higher

values and the differential time to

9999 (No control), and switch on

the start signal.

Is the process

value steady?

Adjust parameters.

Set the proportional band and

integral time to slightly higher

values and set the differential time

to a slightly lower value to stabilize

the process value.

END

Optimize parameters.

While the process value is steady,

the proportional band and integral

time may be reduced and the

differential time increased

throughout the operation.

((((((

Detector specifications

When the detector used has the specifications that 0

C (32

F) is

equivalent to 4mA and 50

C to 20mA, the set point of 25

C (77

F) is

50% because 4mA is equivalent to 0% and 20mA to 100%.

((((((

The set point setting input (0 to 5V) and detector output (4 to 20mA)

must be calibrated*.

((((((

Set point = 50%

Since the specifications of terminal 2 are such that 0% is equivalent

to 0V and 100% to 5V, enter 2.5V into terminal 2.

((((((

For PU operation, set the set point (0 to 100%) in Pr. 133.

During operation, set the proportional band and integral time to

slightly higher values and set the differential time to 9999 (No control).

In accordance with the system operation, reduce the proportional

band and integral time. For slow response system where a deadband

exists, differential control shuold be turned on and increased slowly.

Determine the set point

Determine the set point of the

item to be adjusted.

((((((

Set the room temperature to 25

C (77

Set Pr. 128 and switch on the X14 signal to enable PID control.

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Mitsubishi Electric FR-E540 Instruction Manual Page 138

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