Mitsubishi Electric F700 Instruction Manual download pdf (Page 129)

124

Extended parameters

Extended parameter list

PID control

127

PID control

automatic

switchover

freqeuncy

0.01Hz 9999

0 to 400Hz

Set the frequency at which the control is

automatically changed to PID control.



9999

Without PID automatic switchover

function

128

PID action selection

110

10 PID reverse action

Deviation value

signal (terminal 1)



11 PID forward action

20 PID reverse action Measured value

input (terminal 4)

Set value (terminal

2 or Pr. 133)

21 PID forward action

50 PID reverse action Deviation value

signal input

(L

ON

W

ORKS

, CC-

Link communication)

51 PID forward action

60 PID reverse action Measured value,

set value input

(L

ON

W

ORKS

, CC-

Link communication)

61 PID forward action

129

PID proportional

band

0.1% 100%

0.1 to 1000%

If the proportional band is narrow

(parameter setting is small), the

manipulated variable varies greatly with a

slight change of the measured value.

Hence, as the proportional band narrows,

the response sensitivity (gain) improves

but the stability deteriorates, e.g. hunting

occurs.

Gain K = 1/proportional band



9999 No proportional control

130

PID integral time

0.1s 1s

0.1 to 3600s

Time required for only the integral (I)

action to provide the same manipulated

variable as that for the proportional (P)

action. As the integral time decreases, the

set point is reached earlier but hunting

occurs more easily.



9999 No integral control.

131

PID upper limit

0.1% 9999

0 to 100%

Set the upper limit value.

If the feedback value exceeds the setting, the

FUP signal is output. The maximum input

(20mA/5V/10V) of the measured value

(terminal 4) is equivalent to 100%.



9999 No function

132

PID lower limit

0.1% 9999

0 to 100%

Set the lower limit value.

If the measured value falls below the setting

range, the FDN signal is output.

The maximum input (20mA/5V/10V) of the

measured value (terminal 4) is equivalent to

100%.



9999 No function

133

PID action set point

0.01% 9999

0 to 100% Used to set the set point for PID control.



9999 Terminal 2 input voltage is the set point.

Func

t

ion

Parameter

Name

Incre

ments

Initial

Value

Range Description

Param

eter

copy

Param

eter

clear

All

param

eter

clear

Related

parameters

: enabled

× : disabled

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