15
Options
8.2 Setpoint ramp (RAMP CAPS)
The 200XLV is capable of rapid response to step demand changes.
However, you can use this facility to limit the motor slew rate if rapid speed changes or
high peak current are undesirable. It limits acceleration and deceleration current during
reversing.
Fit two electrolytic capacitors to the RAMP CAP positions. The speed will ramp exponentially
to the new value in the time indicated below. It takes the same time for the speed demand to
reset when removing power from the unit.
+ +
t
t
Time to ramp
to new speed
Two caps value
200 ms
1 µF
1 second
10 µF
5 seconds
33 µF
15 seconds
100 µF
8.3 Auxiliary trip
If a lower protection limit is required when using a small motor, fit a multi-fuse into the
FUSE position after cutting the FUSE link. The table below shows BOURNS multi-fuse types
according to armature current:
cut link
FUSE
MF-R025
250 mA
MF-R050
500 mA
MF-R075
750 mA
MF-R135
1.35 A
To improve performance during PI operation:
• Adjust the GAIN using the
MAX
preset.
• Increase the INTEGRAL term by adding capacitors to the INT CAP location.
Adding 100 nF increases the integral term by 100 ms.
• Double the PROPORTIONAL term by removing the PG links.
Set the bottom jumper position to select the feedback type: ARMATURE VOLTAGE (AV) or
TACHO POSITION (PID). Note that for supply voltages >30 V, the jumper may have to be
parked on one pin to achieve full-range operation in the PID mode.
For speed feedback using a tachogenerator, select the top jumper to PI mode or PID mode
for increased response.
For position feedback, use the PID mode. Use a square wave input and oscilloscope to
observe the response. Use the
MAX
preset to fine-tune the response. Make sure all feedback
transducers are free from backlash. If feedback is lost, the armature voltage is automatically
limited to within a few volts of the supply voltage.
Summary of Contents for 200XLV
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