4-12 Calibration and Start-Up
DC590+ DRV Series DC Digital Drive
Set Up Speed Feedback
At this point, the drive/motor combination is operating in armature voltage control. The other speed feedback devices were checked and functioning
properly. This section lists the procedure for setting up tachometer generator or encoder speed feedback.
1. Set SPEED FBK SELECT to the proper selection (see the following procedure).
Keypad Description
Press Display
DC 4Q 35A
MENU LEVEL
Navigate to the SPEED FBK SELECT parameter by repeatedly pressing the
key.
Press
M
to edit the parameter.
Press
or
to select ARM VOLTS FBK, ANALOG TACH or ENCODER.
Press
E
to exit.
2. Start the drive; gradually increase the speed demand signal to 50% and monitor DIAGNOSTICS::TERMINAL VOLTS. Measure the
armature voltage on the drive output with a DC voltmeter. TERMINAL VOLTS should read within 10% of the measured value. For
example, when measuring armature volts at terminals A+ and A- with a voltmeter, a 500 VDC armature should read 250 VDC at 50% speed
demand and TERMINAL VOLTS should be within 45 to 55%. If the reading is outside this range, check the drive's voltage calibration before
continuing.
Increase the speed demand to 100% and check the shaft speed accuracy with a hand tachometer. Measure the armature voltage. If fine adjustment
is needed, adjust the drive's calibration according to the speed feedback selection.
3. ARMATURE VOLTAGE FEEDBACK
Armature voltage feedback uses the motor's back EMF as speed feedback and is the drive's default feedback setting. It requires no feedback
device, isolator or additional external connections. The scaling parameter, SETUP PARAMETERS::CALIBRATION::ARMATURE V CAL, fine
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