FMS CMGZ411, Operating Manual

Page: 7 / 40

Operating Manual CMGZ411/421
7
5 The 4 quadrants in drive technology
The four quadrants in drive technology refer to the
speed/torque diagram shown. The x axis shows
speed and the y axis shows torque.
The first quadrant shows positive speed and positive
torque and this results in positive power, eg. drive in
positive direction. In the second and fourth
quadrants, the power is negative because the signs
of speed and torque are different. In the third
quadrant, torque and speed are negative and this
results in positive power, which means driving in
negative direction.
A brake can work only in the second or the fourth
quadrant, because it is not able to drive by
definition. A 1-quadrant drive usually works in the
first quadrant, but can be installed to work in the
third quadrant also. It is not possible to brake with a
1-quadrant drive. A four-quadrant drive is able to
work in all 4 quadrants and able to drive and to
brake in positive and negative rotational direction.
Application
In applications where you need only low dynamic
response, it is possible to use 1-quadrant drives. If a
machine not only has to accelerate fast but also has to decelerate fast, it is necessary to use a 4-quadrant drive to switch
from driving to braking immediately. Only a 4-quadrant drive is able to handle both processes.
A brake would be able to help in the deceleration process, but in the acceleration phase, the brake for itself is
insufficient.
6 Quick installation guide
•
Find your application on pages 8-13
•
Check all your requirements such as:
tension reduction / gain switching / analog outputs / line speed input
•
draw your wiring diagram according to the wiring diagrams on pages 14-16. Do not forget the digital input
„controller enabled“!
•
connect your components
•
Parametrize: nominal force / Machine configuration (according to your chosen number) /
output configuration / start speed / start limit / synchronisation stop
•
Put system into operation and adjust the PID controller as described on pages 20-22
•
If needed, do additional adjustments (such as tension reduction, gain switching, scaling and filtering of analogue
outputs, etc.)
POWER = TORQUE x REVOLUTION SPEED