1
V F - 8 E
Series
Complying with TÜV and
UL Standards—Designed for
improved safety, operability
and functionality
S a fe t y
n P roduct conforming to the EC Low Vo l t age
Directive (TÜV- a p p roved pro d u c t )
• C o n f o rms to DIN VDE 0160
n P roduct conforming to the UL s t a n d a rd
n Accident prevention system
• Data lock function controlled by password .
n Also conforms to the EMC Directive
• By combination use with EMI filter.
n P ro g r a m m a ble passwo rd for operational
i n t e g r i t y
n E l e c t ronic thermal ov e r l o a d
O p e r a b i l i t y
n I m p roved monitoring functions
• Simple operation for frequency settings.
• The main display on the control panel can be altered
between command fre q u e n c y, output frequency and other
s e t t i n g s .
• The four most recent faults are stored in the memory after a
power failure to facilitate system diagnosis.
Indication of fre q u e n c y, trip cause(s), etc.
C o n t rol knob for easy
f requency setting
Indication of Local/Extern a l
c o n t rol for operation signal and
f requency signal, parameter
n u m b e r, etc.
• Frequency resolution
Digital setting: Min. 0.01Hz
Analog setting: Min. 0.1Hz
• Trip cause(s)
Instantaneous overc u rrent (ground fault
and high temperature), overc u rre n t ,
o v e rvoltage, low voltage, auxiliary
interlock, overload, operation error and
a u x i l i a ry stop
F u n c t i o n s
n Simple vector control
• Simple vector control ensures a high torque even at low
speeds (150% torque at 1 Hz).
• The output torque characteristics for general-purpose motors
when operated by an inverter at variable speeds are shown
b e l o w.
n Auto tuning function (with slip compensation)
• This function automatically detects and controls the constant
of a motor re q u i red for vector control and is applicable to
t h ree-phase squirrel-cage motors with 2, 4 or 6 poles.
n Speed search function
• The inverter is activated without stopping the motor (on a
f ree run) for a changeover from the commercial run to an
i n v e rter run or a re t u rn from sudden power failure .
n Improved tripless function
• This function automatically decreases the frequency when
the output current reaches the overc u rrent stall level during
overload operation.
• When the load re t u rns to normal, the function automatically
re t u rns the frequency to its original level and continues
o p e r a t i o n .
• The function prevents overc u rrent trips in equipment such as
kneading machines that are used for viscous materials.
400V 1.5kW
400V 3.7kW
230V 0.2kW
%
150
95~100
80~90
80~100
40~65
16 60 120Hz
20
30
~
Short run torque
Torque
Output frequency
Continued run
torque
M
Hz
MODE
SELECT
PROG.
SET
SHIFT
RUN STOP
Breaker
VF-8E
MC1
MC2
Motor
MC select
button
Output
current
OCS level
(Paremeter No.63)
Output
frequency
Deceleration time with
the value set for
Parameter No.49
Normal acceleration time
The output frequency
does not decelerate
below 10Hz.
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