Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 540 / 550

574
PRACTICAL CIRCUITS
4.7 Automatic operation of fan, pump or the like using
speed setter
(common)
[Auto-manual switch-over operation]
*1 When the power supply is 400V class, install a step-down transformer.
*2 Using the frequency setting gain/bias function of the inverter, you can set the relationship between speed setter output and
output frequency as shown above.
Refer to page 217.
[FR-AL DC tachometer follower]
*3 The FR-AL has the manual-auto change-over, start signal switch and frequency meter.
common
A
B
C
Motor
IM
U
V
W
R
S
T
Inverter
MCCB MC
Ground
ON OFF
M
C
F
T
*1
B C
MC
10
2
5
㧗
㧙
4
60Hz
0Hz
20mA
[
C7
]
SD
STF(STR)
AU
4mA
[
C6 ]
Ready
Fault signal
Power
supply
Manual
Start signal
Auto
PID speed setter
Bias
[
C5 ]
Upper limit
[
Pr. 1 ]
Gain
[
Pr. 126 ]
Speed setter
output
Frequency setting
potentiometer for
manual operation
2W1k
4 to 20mADC
Fault signal
Related parameters
Frequency setting current bias [ C5, C6(Pr. 904) ]
Frequency setting current gain [ Pr. 126, C7(Pr. 905) ]
㧗
㧙
PID speed
setter
4 to 20mA
4
AU
STF(STR)
SD
FM
10
2
5
AUT
COM
STF
SD1
SD2
FM
10
2
5
FR-AL
DC tach.
follower
Inverter