Midi-Maestro and Maxi Maestro Drive
22
Zero speed torque
RS resistor
No resistor is fitted as standard. Mount an
RS resistor
to adjust the amount of torque current to be applied to
the motor when the Drive has received a
STOP
command.
Dynamic calibration
For modifying the setting, the following equipment is
required:
Low frequency function generator
Frequency range: 0Hz to 10MHz
Output voltage: –3.5V to +3.5V
Twin-trace storage oscilloscope.
1. Remove the speed reference signal from pins 9
and 10.
2. Connect the function generator output to pins 9
and 10.
3. Set the function generator at the following:
Square wave output
Amplitude: ±2V
Frequency: 0.2Hz
4. Connect oscilloscope channel A to pin 11.
5. Connect oscilloscope channel B to pin 1.
6. Connect oscilloscope ground to pin 8.
7. Connect the oscilloscope external trigger input to
the function generator output.
8. Set the oscilloscope as follows:
Sensitivity: 1mV per division
Timebase: 20ms per division
Caution
When the motor load is a slide with limited travel,
avoid the slide activating the limit switches by
increasing the reference signal frequency or decreasing
the reference signal amplitude in order to reduce the
speed.
Note
The minimum acceptable amplitude for the reference
signal is 1V peak to peak.
9. Apply power to the Drive.
10. Enable the Drive.
11. The waveform could be as shown in Figure 22. In
this case, the system has insufficient dynamic
gain. Turn the
PROPORTIONAL potentiometer.
clockwise to obtain a waveform without
oscillation.
V
t
V
t
Function generator
output
Tachogenerator
Figure 22 Waveform resulting from
insufficient proportional gain
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