Mitsubishi Electric FR-A500 Instruction Manual page 148

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.
Set point
Feedback signal (Process value)
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.
Set point
Feedback signal (Process value)
Relationships between deviation and manipulated variable (output frequency)
Deviation
Positive
Reverse action
Forward action
(3) Wiring example
• Sink logic
• Pr. 128 = 20
• Pr. 183 = 14
• Pr. 192 = 16
• Pr. 193 = 14
• Pr. 194 = 15
Note: 1. The power supply must be selected in accordance with the power specifications of the detector used.
2. The output signal terminals used depends on the Pr. 191 to Pr. 194 settings.
3. The input signal terminals used depends on the Pr. 180 to Pr. 186 settings.
[Heating]
+ X>0
Cold → up
Hot → down
X<0
-
[Cooling]
X>0
+
Too cold → down
→ up
Hot
X<0
-
Negative
MCCB
MCCB
R<L
R<L
Power supply S<L
Power supply S<L
T<L
T<L
STF
Forward rotation STF
Forward rotation
STR
Reverse rotation STR
Reverse rotation
RT(Note 3)
PID control selection RT(Note 3)
PID control selection
SD
SD
10
10
Setting potentiometer
Setting potentiometer 2
2
(Set point setting)
(Set point setting)
5
5
1
1
4
4
0 24V
0 24V
DC power
DC power
supply
AC1
AC1
200/220V 50/60Hz
200/220V 50/60Hz
139
Deviation
Process value
Process value
Deviation
Inverter
Inverter
Motor
Motor
>
>
U
1 U
1
>
> IM
2 V IM
2 V
>
>
W
3 W
3
(Note 2)
(Note 2)
FU Upper limit
FU Upper limit
OL
OL
Lower limit
Lower limit
Forward
Forward
IPF
IPF
rotation output
rotation output
Reverse
Reverse
SE
SE
rotation output
rotation output
Output signal common
Output signal common
(Process values) 4 to 20mADC
(Process values) 4 to 20mADC
(Note 1)
(Note 1)
supply
PARAMETERS
Set point
Set point
Pump
Pump
P
P
For 2-wire For 3-wire
For 2-wire For 3-wire
Detector
Detector
type type
type type
- + + - +
- + + - +
(OUT) (COM) (24V)
(OUT) (COM) (24V)
4