DigitAx User Guide
Issue code: dgxu4
10-5
the I
2
t
region. The value of I
2
t is displayed in
Pr80 as a percentage (fully-integrated value =
100). It may be necessary to change the setting
of Pr45, or reduce the duty ratio to reduce the
effective current I
eff
.
10.8 Calibration
In most cases, only small changes will be needed to
the values of parameters to optimize the system to
the application. If a large change is necessary (for
example, due to a load inertia greater than three
times the motor inertia), use the following
procedure:
Warning
During calibration, the
motor is required to drive
the load. Take care to
ensure the following:
It is safe for the machinery
to be operating
The limit switches are not
over-ridden
Procedure
Preliminary settings
1. Connect the motor to the load.
2. Set b7 at 0 (no ramps).
3. Set b12 at 0.
4. Set b18 at 0.
5. Set Pr58 at maximum speed.
6. Ensure that Pr99 is set for the full-scale speed
of the motor.
Digital Reference settings
1. Set b17 at 1
2. Set Pr0 at 0
3. Set Pr1 at Pr58 ÷ 5
4. Set Pr2 at 0
5. Set Pr3 at -(Pr58 ÷ 5)
6. Set Pr19 at 2.5 (0.2Hz)
Note
This setting depends on the transmission
ratio and the mechanical limitations of the
system.
7 Set Pr21 at 1
Analog Reference settings
1. Set bl7 = 0
Connecting the terminals
1. Disconnect terminal B6 (Programmable input).
2. Disconnect terminals B9 and B10 (Analog
Reference Input).
3. Link terminal B9 to terminal B11 (zero volts).
4. Set up a signal generator to deliver the
following output:
Square-wave
Amplitude: –2V to +2V
Frequency: 0.2Hz (NOTE: see digital
reference settings, note 6)
5. Connect the non-inverted output of the signal
generator to terminal B10, and the common to
terminal B11.
6. Set up an oscilloscope as follows:
Both channels at 1V per division
Timebase at 20ms per division
Channel B trigger
7. Attach probe A of the oscilloscope to terminal
B16, and probe B to the signal generator output.
Attach the ground clips of the probes to
terminal B11 or B18 (0V common)
Note
During the next stage, the Drive will cause
the motor shaft to oscillate. Adjustment
may be made as follows:
Using an analog reference signal
If the amplitude of oscillation is excessive, increase
the signal generator frequency. If the speed is too
high, reduce the signal generator output voltage to
not less than ±1V.
Using a digital reference
If the speed is excessive, decrease the values of Pr0,
Pr1, Pr2, Pr3. Increase the inversion frequency by
decreasing the value of Pr19.
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