Yaskawa 750W ServoPack Servo Drive 200-230VAC 1Phase 11A
SGDA-08ASP
Quick Details
Description SGDA-08ASP is a Drives-AC Servo produced by Yaskawa
Servo Amplifier Type SGDA
Rated Output 750W
Supply Voltage 200V
Model Speed/Torque Control (Analog Input)
Factory setting of applicable motor type SGM Servomotor (blank)
Modification type None
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Ysskawa SGDA Servopack features superior functions and performance.
Its compact design allows a volume ratio approximately 1/4 that of
the conventional servo amplifier model. The SGDA features an
auto-tuning function, JOG operation, various monitoring functions,
and a PC monitoring function. It is also compatible with
incremental encoders or absolute encoder feedback. The servo
amplifier circuit board has been coated with varnish to improve
environmental resistance.
Will the power supply source be switched while the VFD is running?
This occurs in many buildings, such as hospitals, where loads are
switched to standby generators in the event of a power outage. Some
drives will ride through a brief power outage while others may not.
If your application is of this type, it must be reviewed with the
drive manufacturer for a final determination of drive capability.
* Is the load considered hard to start? These are the motors that
dim the lights in the building when you hit the start button.
Remember, the VFD is limited in the amount of overcurrent it can
produce for a given period of time. These applications may require
oversizing of the VFD for
higher current demands.
* Are starting or stopping times critical? Some applications may
require quick starting or emergency stopping of the load. In either
case, high currents will be required of the drive. Again,
oversizing of the VFD maybe required.
* Are external motor disconnects required between the motor and the
VFD? Service disconnects at motor loads are very often used for
maintenance purposes. Normally, removing a load from a VFD while
operating does not pose a problem for the VFD. On the other hand,
introducing a load to a VFD by closing a motor disconnect while the
VFD is operational can be fatal to the VFD.
When a motor is Started at full voltage, as would happen in this
case, high currents are generated, usually about six times the full
load amps of the motor current. The VFD would see these high
currents as being well beyond its capabilities and would go into a
protective trip or fail altogether. A simple solution for this
condition is to interlock the VFD run permissive circuit with the
service disconnects via an auxiliary contact at the service
disconnect. When the disconnect is closed, a permissive run signal
restarts the VFD at low voltage and frequency.
* Are there power factor correction capacitors being switched or
existing on the intended motor loads? Switching of power factor
capacitors usually generates power disturbances in the distribution
system. Many VFDs can and will be affected by this. Isolation
transformers or line reactors may be required for these
applications.
Power factor correction at VFD-powered motor loads is not necessary
as the VFD itself does this by using DC internally and then
inverting it into an AC output to the motor. All VFD manufacturers
warn against installing capacitors at the VFD output.
Variable Frequency Drive Technologies
Three basic types of variable frequency drives offer certain
advantages as well as disadvantages
depending on your motor application. The new flux vector drive is
also discussed.
While all variable frequency drives (VFDs) control the speed of an
AC induction motor by varying the motor's supplied voltage and
frequency of power, they all do not use the same designs in doing
so. There are three major VFD designs commonly used today: pulse
width modulation (PWM), current source inverter
The sketch in Figure 1.2 might suggest that there is a ‘source’
near the top of the bar magnet, from which Xux lines emanate before
making their way to a corresponding ‘sink’ at the bottom. However,
if we were
to look at the Xux lines inside the magnet, we would Wnd that they
were continuous, with no ‘start’ or ‘Wnish’. (In Figure 1.2 the
internal Xux lines have been omitted for the sake of clarity, but a
very similar Weld pattern is produced by a circular coil of wire
carrying a d.c. See Figure 1.6 where the continuity of the Xux
lines is clear.). Magnetic Xux lines always form closed paths, as
we will see when we look at the ‘magnetic circuit’, and draw a
parallel with the electric circuit, in which the current is also a
continuous quantity. (There must be a ‘cause’ of the magnetic Xux,
of course, and in a permanent magnet this is usually pictured in
terms of atomic-level circulating currents within the magnet
material. Fortunately, discussion at this physical level is not
necessary for ourpurpose.)
Along with showing direction, the Xux plots also convey information
about the intensity of the magnetic Weld. To achieve this, we
introduce the idea that between every pair of Xux lines (and for a
given depth into the paper) there is a same ‘quantity’ of magnetic
Xux. Some people have no diYculty with such a concept, while others
Wnd that the notion of quanti4
Electric Motors and Drivesfying something so abstract represents a
serious intellectual challenge. But
whether the approach seems obvious or not, there is no denying of
the practical utility of quantifying the mysterious stuV we call
magnetic Xux, and it leads us next to the very important idea of
magnetic Xux density (B).
When the Xux lines are close together, the ‘tube’ of Xux is
squashed into a smaller space, whereas when the lines are further
apart the same tube of Xux has more breathing space. The Xux
density (B) is simply the Xux in the ‘tube’ (F) divided by the
cross sectional area (A) of thetube, i.e.
OTHER SUPERIOR PRODUCTS
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Rosemount transmitter 3051- Yokogawa transmitter EJA-
Contact person: Anna
E-mail: wisdomlongkeji@163.com
Cellphone: +0086-13534205279
