User manual

User Manual SCA-SS-70-10
ElectroCraft
®
E-Mail: [e-mail] www.electrocraft.com May 2009
8
3.3 Control Elements
3.4 Operation Modes
Voltage Mode
In the voltage mode the drive is watching the output voltage as a feedback voltage. The
drive can not regulate the speed exactly if the motor is loaded with a higher load. This mode
is used e.g. in conveyors with nearly constant load to control the speed.
Tacho Mode
In the tacho mode the feedback information is coming as a voltage signal from a tacho
mounted at the motor. The speed regulation is very good at each load condition and
qualified for each application to control exactly the speed of a system.
IxR Mode
The IxR mode is a voltage mode with an additional factor to correct the speed under
changing the load. The factor which is adjusted with the IxR potentiometer is only an
approximate value. The speed regulation is good but not stable for all load conditions. It is a
compromise between voltage mode and tacho mode.