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DMM Technology Corp.
DYN4 AC Servo Drive Instruction Manual
REV. ZM7-A10A
CT1
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Electronic Gearing (
GEAR_NUM
Parameter )
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Servo In Position Output Specifications (
ONPOS )
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Servo Position Error Accumulation
On position range is a value used for determining whether the motor has reached the commanded position or not. This
on position range is selectable according to customer’s requirement. Suppose the Pset is the commanded position, and
Pmotor is the real motor position, if
|Pset - Pmotor|<=OnRange
it is said motor is ON the commanded positi
on, otherwise not. That OnRange is set from 1~127. The real position on
range is: OnRange * 360(deg)/16,384. The ONPOS output (JP3-9) phototransistor ON if motor in position and OFF if
motor off position.
On position range defined as:
OnPosRange
x4/65,536x360(deg) = “On Position” (deg)
Ex. If
OnPosRange
is set to 24, then:
24x4/65536x360=0.53deg
JP4. Pin 6 Phototransistor becomes ON when motor within 0.53degree of command position.
Gear number (Gear_Num) is set from 500 to 16,384, default value is 4,096. Gear number provides an
electrical gear ratio: 4096 / Gear_Num, from 0.25 ~ 8.192. For example, if Gear number = 4,096, then
16,384 input counts from pulse will turn motor exactly one revolution. If Gear number = 500, 2,000 pulses
will turn motor one revolution
. Gear number parameter is only applicable to position servo mode.
The servo drives internal position error decides the status of the On Position signal and the Lost Phase
servo drive alarm.
The On Position signal is triggered (LOW) when the servo position error is within the OnPosRange set in
the DMMDRV program. The Lost Phase alarm is triggered when the servo motor is physically 90° or more
out of position for ~2 seconds.
The servo position error is cleared when the drive is disabled using the ENA input and does not accumu-
late when the drive is disabled.
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Analog Input in Position Servo Mode
In position servo mode, the controller can use 0 ~ 10VDC analog input to turn the motor. 0 ~ 10VDC
analog input commands motor from 0 ~ 90*4,096/Gear number (degrees). Ex. if Gear_Num=8,192, a 5.5V
input will move the motor 24.75degrees.
