Calibration and Start-Up 4-7
DC590+ DRV Series DC Digital Drive
b. For motors fitted AC tachometer generators, monitor DIAGNOSTICS::TACH INPUT:
• If the reading is about 0.00%, the drive isn’t getting a feedback signal. Stop the drive, disconnect all power supplies and check the
tachometer generator wiring, connections, feedback card, etc.
• If the reading is not near 10.00%, stop the drive, disconnect all power supplies and verify the calibration settings. Calculate the voltage at
maximum speed using the following formula. Remember to convert the voltage rating of the tachometer generator to Volts per RPM; for
example, 50V/1000 RPM = 0.05V per RPM.
Maximum AC Voltage = Volts per RPM × Maximum Desired RPM × 1.3
Caution
A runaway condition can exist when using an AC tachometer generator on a regenerative model DC590+ DRV, even if the speed reference is always
positive. To avoid this problem, use a non-regenerative drive on a motor with an AC tachometer generator. If using a regenerative DC590+ DRV
Digital drive set minimum demand to 0% under SETUP PARAMETERS::SPEED LOOP::MIN DEMAND.
c. For motors fitted with 5701/5901 Microtachs or wire-ended electrical encoders, monitor DIAGNOSTICS::ENCODER..
• If the reading is about 0 RPM, the drive isn’t getting a feedback signal. Stop the drive, disconnect all power supplies and check the
encoder wiring, connections, feedback card, etc.
• If the reading is negative, stop the drive and change the feedback sign by setting SETUP PARAMETERS::SPEED LOOP::ENCODER
SIGN to POSITIVE or NEGATIVE as required.
• If the reading is not near 10% of the base RPM (for example 175 RPM for a 1750 RPM motor), stop the drive and verify the calibration
settings.
Caution
When changing set up parameters (such as feedback polarity), be certain to save the change before disconnecting control power or the set up will be
lost.
6. If the drive is regenerative and the application requires reverse rotation, provide a negative speed demand, start the drive and verify that the motor
runs in the reverse direction.
7. Stop the drive then SAVE PARAMETERS.
NOTE At this stage, you have successfully run the motor and verified the speed feedback devices are functioning correctly.
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