Electronic Gear Ratio (Denominator) - Delta Electronics ASDA-B Series User Manual

DI Name
GNUM0
NOTE
1) DI signal can be selected by parameter P2-10 to P2-15 and Table 7.A. If uses only need to
use one group of electronic gear, it allows users not to select GNUM0.
P1 - 45▲
GR2

Electronic Gear Ratio (Denominator)

Default: 1
Applicable Control Mode: P
Unit: pulse
Range: 1 ~ 32767
Settings:
Please set electronic gear ratio when the servo drive is Off (Servo 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 settings:
Pulse input
f1
The electronic gear ratio setting range must be within: 1/50<N/M<200.
In terms of the servo drive which the firmware version is V1.018 or above, the electronic gear
ratio can be set when the servo drive is On (Servo On).
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.
Travel distance per pulse = T
Motor ( encoder signal output: A/B, Z )
Encoder PPR: 2500 puls e
Revision January, 2009
Chapter 6 Control Modes of Operation|ASDA-B Series
DI Status
Not select (Note 1)
0
1
Position
N
command
M
N
f2 = f1 x
M
Wor kpiece (Table or Load)
Selected Electronic Gear
P1-44, P1-45
P1-44, P1-45
P1-44, P1-45
Communication Addr.: 012DH
Related Section:
Section 6.2.4, P1-15, P1-44
DI GNUM0(11) in Table 7.A
f1: Pulse input
N: Numerator, the setting value of P1-15 or P1-44
M: Denominator, the setting value of P1-45
Ball Scr ew Pitch: 3mm
f2: Position command
6-5