Midi-Maestro and Maxi Maestro Drive
23
12. When a waveform without oscillation has been
obtained, in most cases the response will have an
overshoot as shown in Figure 23. In this case, the
system has insufficient derivative action. Turn
the
DERIVATIVE potentiometer clockwise to
eliminate the overshoot as shown in Figure 24.
V
t
V
t
Function generator
output
Tachogenerator
Figure 23 Waveform resulting from
insufficient derivative gain
V
t
V
t
Function generator
output
Tachogenerator
Figure 24 Ideal waveform
V
t
V
t
Function generator
output
Tachogenerator
Figure 25 Waveform resulting from excessive
derivative gain
Note
It may be necessary to adjust repetitively the
PROPORTIONAL and DERIVATIVE potentiometers.
If the Drive has instability problems after adjustment
and when it is connected to a position controller, refer
to Commissioning and Diagnostics.
Commissioning
Preliminary checks
1. Check that the correct values of components have
been used. Check the components are correctly
fitted.
2. Check the three cables from the transformer
secondary winding to pins 21, 22, 23 are correct.
Check that the terminals are tight.
3. Check the polarity of the tachogenerator and the
motor.
Note
When a position speed reference is applied to pin 10,
the output voltage on pin 17 is positive. When this is
connected to the positive input of the motor, the motor
turns clockwise as seen from the flange.
To reverse the motor direction, reverse the motor and
tachogenerator connections.
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