TECO JSDG2S-75B-E - Electronic Gear Ratio

5-55
5-4-3 Electronic Gear Ratio
The user can define the Unit Pulse Command input to this Device through the Electronic Gear
Ratio to move the Transmission Device by any distance, the Pulse Command generated by the
Supervisory Controller does not need to consider the gear ratio, reduction ratio or motor encoder
pulses of the Transmission System, the description is as follows:
The following Figure is the Servo Motor Drive Ball Screw Transmission Device, if the work
platform is to be moved by 10mm, how many Pulse Commands the Supervisory Controller need to be
issued to the Servo Driver?
Without Electronic Gear Ratio Function With Electronic Gear Ratio Function
1. The work platform will move 5mm with one
revolution of the Ball Screw.
2. To move the work platform by 10mm, the
Ball Screw needs to be rotated
s 210 r nmm 5m om/rev es lutio
.
3. And the 131072 Pulse Command will cause
the Motor rotate one turn.
4. Therefore, the Supervisory Controller needs
to issue the
e262144pulsrev 2e/rev131072puls 
Command.
 Before every move, the Supervisory
Control must follow the above steps to
calculate the Pulse Command.
 Set the Electronic Gear Ratio first (Assuming
that the Definition One Pulse Command moves
1um, the Electronic Gear Ratio setting method
is detailed in the following Sections)
1. Since One Pulse Command moves 1um.
2. To move the work platform by 10mm, the
Supervisory Controller needs to issue the
10000pulse1um/pulse10mm


command.
 As long as the One Pulse Command Moving
Distance and the Electronic Gear Ratio are
defined first, the Supervisory Control can
easily determine the Pulse Command.
TECO Servo provides two methods to set the Electronic Gear Ratio:
(1) Directly Set the number of Pulse Commands of the Single Rotation - Pn354
(2) Use the Numerator of the Electronic Gear Ratio and Denominator of Electronic Gear Ratio
─ Pn302~Pn306
The two above methods are set and switched by Parameter Pn354, Digital Input Contacts GN1 and
GN2:
Pn354 GN1 GN2 Pulse Command Quantity of Single Rotation
≥ 64 - - Pn354
0~63 OFF OFF Encoder resolution * Pn306 / Pn302
0~63 OFF ON Encoder resolution * Pn306 / Pn303
0~63 ON OFF Encoder resolution * Pn306 / Pn304
0~63 ON ON Encoder resolution * Pn306 / Pn305