Hitachi
SJ700 Series Inverter
***BRAND
NEW***
The
new Hitachi SJ700 variable speed drive represents a dramatic step change
in the state of the art for inverter technology, it being the first off-the-shelf
unit with integral easy sequence programmable functionality (EzSQ) as
standard.
It also incorporates
a brand new patented power switching technology to reduce dVdT, with the
IGBT (insulated gate bipolar transistor) stack at the heart of the drive,
which is associated to motor insulation breakdown by the increased terminal
voltage
of motors when used with AC Inverters.
It is without
doubt the most powerful in it's class, a real all-rounder among AC Inverters.
The sensorless
vector control makes optimal torque and revolution control possible –
even on high loads. With the new
Easy Sequence (EzSQ) programming software, precise positioning and safe
stop according to EN954-1
the SJ700 series of inverters handles complex applications with ease.
Various field bus interfaces enable
easy integration into a variety of networks.
The integrated
Hitachi 32-bit SuperH RISC processor delivers the dynamic response needed
for high-end
applications. To compensate possible temperature fluctuations within the
motor, which might adversely
affect smooth control of the motor, an online/offline motor-autotuning
function is included. A newly
developed internal control process helps to drastically reduce any rotational
fluctuation at low speed,
which enhances process stability and precision.
The SJ700
is one of the most compact drives in its class, but offers an unprecidented
array of features
built-in, such as Advanced Sensorless Vector Control (closed/open loop),
Starting Torque >200%, Full
Torque at 0 Hz, High-Torque Multi-Motor Operation (with SLV), Motor-Autotuning
(online/offline), integral easy sequence programmable functionality (EzSQ),
safe stop according to EN954-1, Quick-Stop Function,
RS485 and RS422 interfaces, PID Control, P/PI Control, Automatic Voltage
Regulation, Motor Thermistor
Input, User Macro Saving and Global Standards to CE, UL, c-UL, CTick,
CSA.
The SJ700
is designed for any application, ideally suited to highly dynamic applications
such as packaging,
printing, textile, machine tool industries, lifts, cranes, centrifuges,
extruders and any application which
requires high starting torques or is subject to shock loads. There are
seven inputs of which five are
programmable, two programmable transistor outputs, one programmable relay
output and a dedicated
thermistor input terminal. Access to the terminal rails is by removing
the lower front case. There is also
the option of a variety of fieldbus communications.
Speed setting
is either via the keypad, an external analogue or digital signals or fieldbus
communications.
A removable keypad with LED display comes as standard and is used for
programming. The SJ700 has
advanced protection sensing circuits and there are alarms for overcurrent,
over voltage, under voltage,
over temperature, overload, ground fault and so forth. Automatic voltage
regulation is included for
output voltage control.
The SJ700
will cover from 0.75kW through to 400kW and is a truly global product
and carries UL and CSA
approvals as well as being CE certified for low voltage, EMC Directives
and is RoHS Compliant.
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