User`s manual

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9
9-5 Electronic gear setup methods and restrictions
Normally, all coordinate-related data of JW-12PS/14PS is managed in pulses. However, when
electronic gears 1/2 in parameter are used, data can be managed in mm, for example. (Speed data also
becomes mm/s, for example.)
These electronic gears are used in closed loop control. Note, however, that care must be paid to the
settings as the following restrictions apply.
[1] Restriction 1 when setting up the electronic gear
(1) Restrictions when setting up electronic gears M1 and D1
1.When setting the M1 value and D1 value of electronic gear 1, set their ratio to "100" or less.
M1/D1 100
2.When interpolation is programmed, match the unit system of the axis to be interpolated by
electronic gear 1 (M1/D1 value).
(2) Restrictions when setting up electronic gears M2 and D2
When setting the M1 value and D1 value of electronic gear 2, set their ratio to "214" or less.
M2/D2 214
Setting example
When M1 is set to 5000 and D1 is set to 500, D2 of electronic gear 2 normally becomes 500, the
same as D1. At this time, the setting range of M2 is as follows:
M2/D2 214
M2 107000
When the number of feedback pulses (M2) from the encoder does not fall within this range, feedback
control on this module cannot be used. (An encoder and a gear ratio are required.)
JW-12PS/14PS
Driver
Motor
Gear
Table
Encoder
Pulse
output
section
Encoder
input
section
The encoder cannot be used when the feedback pulse is not 214 or
less when multiplied by a factor of 4 when the JW-12PS/14PS
outputs a single pulse.
Cautions (selection of the encoder for feedback including the above restrictions)
• Take the following into consideration when setting the gear ratio of the encoder to be used for
feedback.
Select an encoder whose feedback pulse becomes 214 or less when multiplied by a factor of
4 when this module outputs a single pulse. (When a large gear ratio is not set, general-
purpose encoders can be used.)