Calibration and Start-Up
4-13
DC590+ DRV Series DC Digital Drive
tunes the drive's armature voltage calibration and has a range of 1.1000 to 0.9800, corresponding to -10% to +2% trim. Changes outside this range
require re-calibration as described earlier in this Chapter.
IR COMPENSATION SETUP
Properly setting the PARAMETERS::CALIBRATION::IR COMPENSATION parameter, or motor loss compensation, improves the speed
accuracy when running in armature voltage feedback.
•
Run the motor without a load. Monitor the actual speed with a hand tachometer.
•
With the same speed setpoint, run the motor at full load and monitor the actual speed again with a hand tachometer.
•
Adjust IR COMPENSATION until the full load speed is the same as the no load speed.
NOTE
Too much IR COMPENSATION causes instability.
4.
MICROTACH or WIRE-ENDED ELECTRICAL ENCODERS
•
You can monitor the encoder speed under DIAGNOSTICS::ENCODER in the keypad.
•
Either encoder gives rotational speed for which adjustment is unnecessary; however, the process may require an accurately set speed
calibration. If required, adjust the calibration parameter CONFIGURE DRIVE::ENCODER RPM to match the motor rotational speed to the
roll speed with a hand tachometer. Speed match the motor through the ratio calculation:
New ENCODER RPM Setting = Present ENCODER RPM Setting
×
Desired RPM
÷
Measured RPM
5.
AC/DC ANALOG TACHOMETER GENERATOR
•
Settings on the analog tachometer generator feedback option card give a coarse scaling of the analog tachometer generator feedback voltage.
Fine-tune the feedback by adjusting drive software parameters.
NOTE
The option card settings for AC tachometer generators are 1.3 × Calculated Value.
Use a hand tachometer to measure the motor speed and adjust SETUP PARAMETERS::CALIBRATION::ANALOG TACH CAL to scale the
overall feedback. Speed match the motor through the ratio calculation:
New ANALOG TACH CAL Setting = Present ANALOG TACH CAL Setting
×
Desired RPM
÷
Measured RPM
The gain range varies from 1.1000 to 0.9800, or -10% to +2% trim. Changes outside this range require a re-calibration of the feedback calibration
card as described earlier in this chapter.
If a tachometer’s observed operation is within its rated accuracy, adjustment is not recommended and will complicate speed calibration.
6.
SAVE PARAMETERS when finished.
Summary of Contents for 590+ DRV
Page 1: ...590 DRV Frame 1 2 3 4 5 6 7 HA470388U003 Issue 2 Product Manual...
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Page 126: ...3 88 Installing the Drive DC590 DRV Series DC Digital Drive...
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Page 166: ...5 8 Control Loops DC590 DRV Series DC Digital Drive...
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Page 274: ...A 30 Serial Communications DC590 DRV Series DC Digital Drive...
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Page 292: ...B 16 Certification DC590 DRV Series DC Digital Drive...
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Page 330: ...C 36 Parameter Specification Tables DC590 DRV Series DC Digital Drive...
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Page 368: ...D 20 Programming DC590 DRV Series DC Digital Drive Functional Description...
Page 496: ...D 148 Programming DC590 DRV Series DC Digital Drive Programming Block Diagram Sheet 1...
Page 497: ...Programming D 149 DC590 DRV Series DC Digital Drive Programming Block Diagram Sheet 2...
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