User manual

User Manual SCA-SS-70-10
+Tacho –Tacho: Analog Tachometer Feed Back
The +Tacho –Tacho inputs transmit an analog set value for the number of revolutions from
a tachometer coupled to the motor, back to the servo amplifier. This feature improves the
accuracy of speed control, stable even in cases of a large load change. The input is given in
form of a differential amplifier without ground connection.
Additional information about the schematic refer chapter 3.2.
Range of Input Voltage -50 V to +50 V
Input Impedance 50 kOhm
Permanent Input Protection -60 V to +60 V
WARNING:
Correct polarity is crucial. Otherwise the motor operates at maximum speed
without any control.
7.4 Analog Outputs
Monitor n: Motor Speed Output
This feature shows the motor speed as a voltage signal. After adjusting the n max
potentiometer at maximum Set value (refer chapters 4.x.2) the output goes to 10 V if the
maximum speed is reached.
Additional information about the schematic refer chapter 3.2.
Range of Output Voltage -10 V to +10 V
Output Impedance 10 kOhm
Permanent Output Current 100 µA max., source and sink
Monitor I: Motor Current Output
Monitor I delivers a result representing the actual value of the peak motor current. The
proportionality factor is fixed to 0.5V per 1A motor current.
Additional information about the schematic refer chapter 3.2.
Range of Output Voltage -10 V to +10 V
Output Impedance 10 kOhm
Permanent Output Current 100 µA max., source and sink
ElectroCraft
®
E-Mail: [e-mail] www.electrocraft.com May 2009
39