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MITSUBISHI ELECTRIC
FR-F 740 EC
Application Examples
Ventilation systems of modern painting
plants often have high-powered motors.
This makes them an ideal application for
frequency inverters, which can replace the
contactors and “soft starter” systems with
bypass circuits that are often used in these
installations.
The higher initial investment involved in
installing frequency inverters can pay for
itself in a very short time because of the
many benefits of this solution.
Benefits
Ȝ
Reduction of switch-on and start-up
currents, also compared to soft starter
systems, thus reducing peak load
power costs.
Ȝ
Gentle flying starts for fans that are al
-
ready rotating in duct drafts, thus in
-
creasing general system service life.
Ȝ
Motor speed reduction for lower
throughput at low demand times with
-
out dampers for significant power sav
-
ings.
Ȝ
No need for bypass contactors.
Ȝ
Motor pre-heating is possible.
Ȝ
With properly-dimensioned drive sys-
tems and brake modules you can also
stop the fans quickly, for example when
fir extinguishing gas needs to be used.
Specifications
Ȝ
Drive system with 4-pole motor, 132 kW
Ȝ
Frequency inverter: FR-F 740-03250 EC
Ȝ
Acceleration/braking times: 360 s
Ȝ
S-ramp programming
Ȝ
Flying start function
Ȝ
Optimum Excitation Control function
Ȝ
Regeneration avoidance function
Ȝ
Control via analog signal (0-10 V)
Ȝ
Output frequency range 22-50 Hz
Ȝ
Average power consumption of conven
-
tional system per 24 h: 2,890 kWh
Ȝ
Average power consumption of
frequency inverter system per 24 h:
2,610 kWh
APPLICATIONS
Ventilation system
300
100
25
0
Comparison of the per-day power
consumption of a conventional pain
-
ting plant ventilation system (black
line) and a speed-controlled system
(green line).
Time [h]
Power required [%]
Start
Low load
(night mode)
1
st
load peak
Normal
throughput
2
nd
load peak