Setting Of The Electronic Gear (Pr.420, Pr.421) - Mitsubishi Electric FR-E700EX Instruction Manual

Position control
4.5.8

Setting of the electronic gear (Pr.420, Pr.421)

Set the ratio of the machine side gear and the motor side gear.
Parameter
number
Command pulse
420 multiplication numerator
(electronic gear numerator)
Command pulse
multiplication denominator
421
(electronic gear
denominator)
The above parameters can be set when Pr.160 Extended function display selection = "0". (Refer to page 182)

With the operation panel of the drive unit, up to "9999" can be set as a setting value. With a parameter unit or FR configurator, up to the highest value in
the setting range can be set.
 The position resolution (travel per pulse 
of pulses per motor rotation, and is represented by the following expression.
s s
= =

Pf 5120
 The position resolution (travel per pulse 
s
Pr.420

=

Pf Pr.421
<<Setting example>> When setting travel per pulse to 0.01mm in a machine with s = 10mm.
 : 0.01[mm], s: 10[mm], Pf: 5120[pulse/rev]
10
Pr.420

0.01 =
5120 Pr.421
NOTE
 The electronic gear setting of 1/900 or lower is limited at 1/900, and 900 or higher at 900.
108
Name Initial value
[mm]) is determined by the travel per motor revolution s [mm] and the number

:travel per pulse
s
:travel per motor rotation
Pf :number of pulses per motor rotation (= 5120) [pulse/rev]
[mm]) can be changed with the electronic gear setting.

:travel per command
s
:travel per motor rotation
Pf :number of pulses per motor rotation (= 5120) [pulse/rev]
 Pr.420 = 128, Pr.421 = 25
Setting
range
1 1 to 32767 
1 1 to 32767

[mm]
[mm]
[mm]
[mm]
Description
Set the electric gear. The gear ratio range
is from 1/900 to 900.
Pr.420 is a numerator and Pr.421 is a
denominator.