Setting Of Feedback Pulse Electronic Gear - Mitsubishi Electric MR-J3-B-RJ006 Instruction Manual

4. OPERATION AND FUNCTIONS

4.1.5 Setting of feedback pulse electronic gear

The numerator (parameter No.PE04, PE34) and denominator (parameter No.PE05, PE35) of the electronic
gear are set to the motor side encoder pulse. Set the electronic gear so that the number of motor encoder
pulses per motor revolution is converted to the number of load side encoder pulses. The relational expression
is shown below.
Parameter No.PE04 Parameter No.PE34
Parameter No.PE05 Parameter No.PE35
Select the load side encoder so that the number of load side encoder pulses per servo motor revolution is
within the following range.
12
4096 (2 ) Number of load side encoder pulses per servo motor revolution 67108864 (2
(1) When the servo motor is directly coupled with a ball screw and the linear encoder resolution is 0.05m
Condition
Servo motor resolution: 262144pulse/rev
Servo motor reduction ratio: 1/11
Ball screw lead: 20mm
Linear encoder resolution: 0.05 m
Servo motor with reduction gear
Number of linear encoder pulses per ball screw revolution is calculated.
Number of linear encoder pulses per ball screw revolution
Ball screw lead/Linear encoder resolution
20mm/0.05 m 400000pluse
1) Parameter No.PE04 2) Parameter No.PE34
3) Parameter No.PE05 4) Parameter No.PE35
POINT
If setting a wrong value in the feedback pulse electronic gear (parameter
No.PE04, PE05, PE34, PE35), a parameter error (37) and an abnormal
operation may occur. Also, a fully closed loop control error (42) may occur
during the positioning operation.
Number of load side encoder pulses per servo motor revolution
Number of motor encoder pulses per servo motor revolution
Linear encoder
Head
Table
400000 1 1) 3125
262144 11 3) 22528
4 - 4
26
)
2) 1
4) 1