Mitsubishi Electric FREQROL Manuel d'instructions télécharger pdf (Page 419)

100

101

Parameter Special operation

FR-E700 EC 6 - 279

Calibration example

Example 쑴

A detector of 4mA at 0°C and 20mA at 50°C is used to adjust the room temperature to 25°C

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

I001237E

Fig. 6-141: Calibration example

Set the room temperature to 25°C

Set Pr. 128 to "20" or "21" to enable PID control.

Start

Determination of set point

Conversion of set point into %

Determine the set point of what is

desired to be adjusted.

Calculate the ratio of the set point to

the detector output.

Detector specifications

When 0°C → 4mA and 50°C → 20mA are used, the set point

25°C is 50% on the assumption that 4mA is 0% and 20mA

is 100%.

Make calibration.

Make the calibration as described in the following section

when the target setting input (0 to 5V) and detector output (4

to 20mA) must be calibrated.

Setting of set point

Input a voltage across terminals 2-5

according to the set value %.

When the set point is 50%

As the terminal 2 specifications are 0% → 0V and 100% → 5V,

input 2.5V to the terminal 2 for the set point of 50%.

Operation

To stabilize the measured value,

change the proportional band

(Pr. 129) to a larger value, the

integral time (Pr. 130) to a slightly

longer time.

When performing operation, first set the proportional band

(Pr. 129) to a slightly larger value, the integral time (Pr. 130)

to a slightly longer time, and the differential time (Pr. 134) to

"9999" (no function), and while looking at the system opera-

tion, decrease the proportional band (Pr. 129) and increase

the integral time (Pr. 130).

Is the set point stable?

Ye s

Parameter adjustment

Parameter optimization

While the measured value is stable

throughout the operation status, the

proportional band (Pr. 129) an the inte-

gral time (Pr. 130) may be decreased.

Adjustment end

Set the proportional band (Pr. 129)

to a slightly larger value, the integral

time (Pr. 130) to a slightly longer

time, and the differential time

(Pr. 134) to "9999" (no function),

and turn on the start signal.

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Mitsubishi Electric FREQROL Manuel d'instructions Page 419

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