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Sigma II User's Manual
5. Electronic gear ratio is given as:
If the gear ratio of the motor and the load shaft is given as:
where m is the rotation of the motor and n is the rotation of the load shaft,
Electronic gear ratio
Note: Make sure the electronic gear ratio satisfies the following condition:
0.01 ≤ Electreconic gear ratio
The servo amplifier will not work properly if the electronic gear ratio exceeds this range. In that case,
modify either the load configuration or the reference unit.
6. Set the parameters.
Reduce the electronic gear ratio to the lower terms so that both A and B are inte-
gers smaller than 65535, then set A and B in the respective parameters:
( )
B
A
Parameter
Pn202
Electronic Gear Ratio (Numerator)
Pn203
Electronic Gear Ratio (Denominator)
Set the electronic gear ratio according to equipment specifications.
Electronic gear ratio =
•
B = [(Number of encoder pulses) × 4] × [motor speed]
•
A = [Reference units (travel distance per load shaft revolution)] × [load shaft
revolution speed]
B
---
=
Travel distance per load shaft revolution (reference unit)
A
B
---
≤ 100
A
Pn202
Electronic Gear Ratio (Numerator)
Pn203
Electronic Gear Ratio (Denominator)
Signal
SGDH Servo amplifier
Reference
Electronic
input pulse
gear
B
-- -
=
A
Chapter 5: Parameter Settings and Functions
B
---
A
Number of encoder pulses
Setting
Range: 1 to 65535
Default Setting: 4
Range: 1 to 65535
Default Setting: 1
SGMoH
M
servomotor
Pn202
Pn203
5-30
m
--- -
m
×
4
×
n
--- -
m
Control Mode
Position Control
Position Control
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