User Manual EA4709 / EA4718
ElectroCraft
®
E-Mail: [email protected] www.electrocraft.com May 2009
33
7.3 Analog
Inputs
+Set val. –Set val.: Inputs for Set Values
An ex10/-10 V analog signal for speed or for current is entered using +
Set val
and
–
Set val
inputs. If the effective voltage is 0V, the motor stops. If the effective voltage is
positive, the motor moves in one direction. If the input is negative, the motor consequently
will be move in the opposite direction.
These inputs are given in form of a differential amplifier, so each of them can be related to
ground. This offers the possibility to preset the level control in only one direction.
Additional information about the schematic refer chapter 3.2.
Range of Input Voltage
-10 V to +10 V
Input Impedance
20 kOhm
Permanent Input Protection
-30 V to +30 V
As an alternative, the set value can be entered using an external potentiometer (10 kOhm).
For this purpose, connect the slide resistance to
+Set val.
, the left stop to
-10V
and the right
stop to
+10V
. This procedure requires the -
Set val.
input to be bridged to
GND
.
The admissible range for the set value is limited by the programmed
Scale
speed value. In
this case, the desired maximum speed can be selected according to the maximum input
voltage.
Note:
If the motor does not stop at input voltage = 0 V, fine tuning has to be performed
using
Offset
potentiometer.
