273
PARAMETERS
June 1999
96-8000
Parameter 5 X RATIO (STEPS/UNIT)
The number of steps of the encoder per unit of travel. Encoder steps supply four (4) times their
line count per revolution. Thus, an 8192 line encoder and a 6mm pitch screw give:
8192 x 4 x 25.4 / 6 = 138718
(5 steps per unit inch/mm ratio)
Parameter 6 X MAX TRAVEL (STEPS)
Max negative direction of travel from machine zero in encoder steps. Doesnot apply to A-axis.
Thus a 20 inch travel, 8192 line encoder and 6 mm pitch screw give:
20.0 x 138718 = 2774360
Parameter 7 X ACCELERATION
Maximum acceleration of axis in steps per second per second.
Parameter 8 X MAX SPEED
Max speed for this axis in steps per second.
Parameter 9 X MAX ERROR
Max error allowed in servo loop before alarm is generated. Units are encoder steps. This is the
macximum allowable error in Hz between the commanded speed and the actual speed. The
purpose of this parameter is to prevent "motor runaway" in case of phasing reversal, or bad
parameters. If this parameter is set to 0, it defaults to 1/4 of parameter 183 Max Frequency.
Parameter 10 X FUSE LEVEL
Used to limit average power to motor. If not set correctly, this parameter can cause an
îš“overloadîš” alarm.
Parameter 11 X BACK EMF
Back EMF of motor in volts per 1000 RPM times 10. Thus a 63 volt/KRPM motor gives 630.
Parameter 12 X STEPS/REVOLUTION
Encoder steps per revolution of motor. Thus, an 8192 line encoder gives:
8192 x 4 = 32768
Parameter 13 X BACKLASH
Backlash correction in encoder steps.
Parameter 14 X DEAD ZONE
Dead zone correction for driver electronics. Units are 0.0000001 seconds.
Parameter 15 Y SWITCHES
See Parameter 1 for description.
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