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MITSUBISHI ELECTRIC
FR-F 740 EC/E1
APPLICATIONS
Retrofitting this stamping press with the
FR-F 740 frequency inverter brought signi
-
ficant energy savings. The secret is the FR-F
740’s intelligent Flux Optimisation mode.
During the phase of the stamping sequen
-
ce with low overload requirements Flux
Optimisation mode quickly reduces the
motor voltage.
Die kurze Regelzeit der Flux-Optimisation
ist der Schlüssel zum Erfolg: Die Spannung
wird für den nächsten Stanz-Vorgang wie
-
der angehoben.
Specifications
Ȝ
Manually-operated stamping press with
400 tons stamping pressure
Ȝ
Powered by a 4-pole motor (55 kW)
Ȝ
Frequency inverter: FR-F 740-75k
Ȝ
Operation: The press is operated with
the motor running at constant speed.
During the stamping sequence the
power required for punching out the
metal components is transferred briefly
to the punch by engaging a magnetic
clutch coupling.
Ȝ
Power consumption:
As the graphs below show, the power
consumption of the press is identical for
both pressing operations.
However, the low load cycle power con-
sumption (magnetic clutch disengaged)
drops when a frequency inverter is
used:
Normal operation of the stamping
press: 7.8 kW
Stamping press operated with fre
-
quency inverter: 5.3 kW
Ȝ
Depending on the design of the drive
system used it may also be necessary to
use an (optional) brake resistor in appli
-
cations like this.
Benefits
Ȝ
Energy savings
Flux optimisation mode prevents un-
necessary power consumption. Energy
is conserved in every phase of the cycle
when the motor load is less than 100%.
Ȝ
Simple installation
Retrofitting applications like this stam-
ping press with a frequency inverter is
very quick and trouble-free.
Ȝ
Enhanced precision
The option of variable motor speed pro
-
vides better control over your
application and thus improves
manufacturing precision and product
quality.
Stamping press
(small metal parts production)
0
20
40
60
kW
7.8 kW
0
20
40
60
kW
5.3 kW
Press
stroke
Normal operation without Flux Optimisation
Magnetic
clutch
Operation of the press with Flux Optimisation
Press
stroke
Magnetic
clutch