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Chapter 6 Control Modes of Operation|ASDA-AB Series
6-8 Revision January 2009
2) So if user change the control mode to Pr mode and switching power off and on, the servo
drive of parameter P1-36 will auto set the value to 20.
6.2.5 Electronic Gear Ratio
Relevant parameters:
P1 - 44▲
GR1 Electronic Gear Ratio (1st Numerator) (N1) Communication Addr.: 012CH
Default: 1 Related Section:
Applicable Control Mode: P Section 6.2.5
Unit: Pulse
Range: 1 ~ 32767
Settings:
Multiple-step electronic gear numerator setting. Please refer to P2-60~P2-62.
P1 - 45▲
GR2 Electronic Gear Ratio (Denominator) Communication Addr.: 012DH
Default: 1 Related Section:
Applicable Control Mode: P Section 6.3.6
Unit: Pulse
Range: 1 ~ 32767
Settings:
Electronic gear denominator setting.
It is recommended to set electronic gear ratio when the servo drive is Off. As the wrong setting
can cause motor to run chaotically (out of control) and it may lead to personnel injury, therefore,
ensure to observe the following rule when setting P1-44, P1-45.
The electronic gear ratio setting (Please also see P1-44, P2-60~P2-62):
f1
f2 = f1 x
N
M
N
M
Pulse input
Position
command
The electronic gear ratio setting range must be within: 1/50<N/M<200.
The electronic gear function provides easy travel distance ratio change. However, the over high
electronic gear ratio will command the motor to move not smoothly. At this time, the users can use low-
pass filter parameter to improve this kind of situation. For example, assume that the electronic gear ratio
is equal to 1 and the encoder pulse per revolution is 10000ppr, if the electronic gear ratio is changed to
0.5, then the motor will rotate one pulse when the command from external controller is two pulses.
For example, after the proper electronic gear ratio is set, the reference travel distance is 1 μm/pulse, the
machinery will become easier to be used.
f1: Pulse input f2: Position command
N: Numerator 1, 2, 3, 4, the setting value of P1-44 or
P2-60 ~ P2-63
M: Denominator, the setting value of P1-45