Mitsubishi Electronics FR-A500 ユーザーズマニュアル

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4) Reverse action

Increases the manipulated variable (output frequency) if deviation X (set point - process value) is positive,
and decreases the manipulated variable if deviation is negative.

 

5) Forward action

Increases the manipulated variable (output frequency) if deviation X (set point - process value) is negative,
and decreases the manipulated variable if deviation is positive.

 

Relationships between deviation and manipulated variable (output frequency)

• Sink logic
• Pr. 128 = 20
• Pr. 183 = 14
• Pr. 192 = 16
• Pr. 193 = 14
• Pr. 194 = 15

Deviation

Positive

Negative

Reverse action

Forward action

X>0

X<0

+

-

Process value

Set point

[Heating]

Feedback signal (Process value)

Cold

 → 

up

Hot

   → 

down

Deviation

Set point

X>0

X<0

+

-

Set point

Too cold

 → 

down

Hot

          → 

up

Set point

[Cooling]

Feedback signal (Process value)

Process value

Deviation

NFB

0 24V

AC1

φ

200/220V 50/60Hz

STF

STR

RT(Note 3)

SD

10

2

5

1

4

U
V

W

(Note 2)

FU

OL

SE

(Process values) 4 

∼ 

20mADC

IM

P

-

+

+

+

-

(OUT)

(24V)

IPF

(Note 1)

Power supply

Forward rotation

Reverse rotation

PID control selection

Setting potentiometer

(Set point setting)

Inverter

Motor

Pump

Upper limit

Lower limit

Forward
rotation output
Reverse
rotation output

Output signal common

For 2-wire

type

Detector

For 3-wire

type

DC power

supply

(COM)

R
S
T