Fig 6.28 Example Of Electronic Gear Setting (Turn Table); Fig 6.29 Block Diagram Of Electronic Gear - OE Max Controls CSDJ Plus User Manual

6 - 32 CSDJ Plus Servo Drive User's Manual
Minimum rotation unit of the load shaft, which has to
rotate by 1 pulse of external pulse command=0.1˚
CSM Motor Encoder Pulse Number : 2048

Fig 6.28 Example of Electronic Gear Setting (Turn Table)

Position
Position
Command
Command
Pulse Form
SEt-46 LED No.1
Encoder
Signal Output
Setting value of SEt-36 and SEt-37 should at least satisfy the following formula.
[Number of pulse per 1 motor rotation] ×[Machine gear ratio of load and motor shaft]
In case of which the formula above is not satisfied, it can be used as a pulse command
but resolution cannot be guaranteed.
Maximum resolution =
If the setting value does not satisfy the relationship above, take care of the following:
First, increase the minimum unit desired to move with 1 command pulse..
(Reduces the resolution.)
Second, use an encoder which outputs more than SEt-37 setting value
rotation
Third, increase the machine gear ratio or use small pitch of ball screw.
The position control resolution of CSDJ Plus Servo Drive is ±1 pulse.
In fig 6.23, SEt-36=2048 and the maximum value that can be obtained of SEt-
37 is 2048×4=8192. Thus, minimum unit which moves by 1 command pulse
!
can be calculated as shown below.
Warning
When actually applying, design with sufficient amount more than minimum unit.
Command Unit =
Electronic gear ratio setting :
Filter Cutoff Frequency
Electronic Gear
SEt-36, 37
Filter Cutoff Frequency
SEt-35
Pulse
Counter
N/M Frequency
Dividing Ratio
SEt-23,24

Fig 6.29 Block Diagram of Electronic Gear

×4 ≥ [Setting value of SEt-37]
[Number of pulse per 1 motor rotation]×
[Machine gear ratio of load and motor shaft]×4
Minimum distance moved by 1pulse of
position command
Load movement amount
per 1 load shaft rotation
Minimum rotation unit
2048×3 6144 Setting value of SEt-36
= =
Setting value of SEt-37
3600
3600
Feedforward Gain
SEt-34
SEt-07
Position
Control
SEt-4
Speed
Measurement
1
10㎜
=
8192
360˚
=
0.1˚
of load
Speed
Torque
Control
Control
SEt-2,3
SEt-6,10∼15
4 Multiplication
4 pulses per 1 motor
×
= 1.22㎛
3600
=
Motor
CSM
Encoder