Technical information

75
MITSUBISHI ELECTRIC
INVERTER
INVERTER ///
Intelligent Motor Control Functions
Compatible with many new applications
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PID control
The integrated PID control for example
supports a flow control for pumps.
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Torque boost
Torque boost selection is possible.
Comprehensive protection
functions for safe operation
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Built-in electronic overcurrent protection
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Selection of the protection function for auto-
matic retry after alarm occurence.
Flexible 5-point V/f curve
Theintegratedflexible5-pointV/fcurveen-
ables you to match the torque cur ve perfectly
to the characteristics of your machine.
Magnetic flux vector control
The integrated flux vec tor control (except
FR-S500E) of the inverters system makes it
possible to achieve high torques, even at low
motor speeds.
High accuracy/fast response speed operation
by vec tor control can be performed with a
general-purpose motor without encoder
when the real sensorless vector control of the
FR-A700 inverter series is used.
When the FR-A7AP is mounterd to the FR-A700,
full-scale vector control operation can be
performed using a motor with encoder. Fast
response/h igh accuracy speed control (zero
speed control, servo lock), torque control, and
position control can be per formed. Vec tor
control offers excellent control characteristics
when compared to V/F control and other con-
trol techniques, achieving the control charac
-
teristics equal to those of DC machines.
Compatible with numerous I/Os
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Multi-speed operation
(15 different pre-selected speeds
are available)
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0/4to20mAand0to5VDC/
0to10VDCcontrolinput
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Multi-input terminals: selection of different
input functions
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Multi-output terminals: selection of
different output functions
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24 V external power supply output
(permissible values: 24 V DC/0.1 A)
Operating functions and other
convenient functions
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Frequency jumps (three points) to avoid the
machine's resonant frequency
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Fast acceleration/deceleration mode
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Full monitoring capabilities for monitoring
actual operating time and much more
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Switch between two sets of motor
characteristics by means of a second
parameter function
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Zero current detection
Second electronic thermal function
This function is used to rotate two motors of
different rated c urrents individually by a single
inverter.
Regeneration avoidance function
The regeneration avoidance function of the
FR-F700 and FR-A700 can prevent the inver ter
from being shut down by regenerative over-
voltages when strong regenerative loads cause
power to be released into the frequency in-
verter (for example when braking the motor
or with loads that actively drive the motor).
The inverter can automatically increase the
output frequency or disable the braking ramp
when a programmed threshold value is
reached. The response sensitivity, dynamics
and working range are all adjustable.
For example, this function can prevent
ashutdownwithanovervoltageerror
when the speed of a fan controlled by the
inverter is increased by the draft f rom another
fan operating in the same ventilation duc t.
Thefunctionthentemporarilyincreasesthe
output frequency above the setpoint value.
Thisfunctioncanalsobeusedtobrakeloads
with the DC bus voltage, without using braking
modules.
Automatic restart after
instantaneous power failures
In pump and fan applications normal operation
can be continued automatically after brief
power failures. The s ystem simply reactivates
the coasting motor and automatically acceler
-
ates it back up to its setpoint speed.
The graphic below shows how the frequency
inverter can respond to a brief power outage.
Instead of coasting down completely and stop-
ping, the motor is automatically "caught" by the
frequency inver ter and re-accelerated back up
toitspreviousspeed.
Maintenance timer
The maintenance timer func tion (except
FR-E500) can be used to monitor the
service life of different components.
0
V/F5
V/F4
V/F3
V/F2
V/F1
IPF
Base frequency
V/f pattern
Torque
characteristic
Voltage
V/f characteristic
Restart
acceleration
Deceleration
Power supply
Output frequency
Automation Book_UK_2008.prn
Automation Book_UK_2008
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