Delta Electronics ASDA-B Series GR2, Electronic Gear Ratio Denominator Communication Addr DH

Chapter 6 Control Modes of OperationASDA-B Series

DI Name	DI Status	Selected Electronic Gear
	Not select (Note 1)	P1-44, P1-45
GNUM0	0	P1-44, P1-45
	1	P1-44, P1-45

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)	Communication Addr.: 012DH
Default: 1		Related Section:
Applicable Control Mode: P		Section 6.2.4, P1-15, P1-44
Unit: pulse		DI GNUM0(11) in Table 7.A
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		Position		f1: Pulse input	f2: Position command
		N	command		N: Numerator, the setting value of P1-15 or P1-44
		M
	f1		f2 = f1 x	N
				M	M: Denominator, the setting value of P1-45

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

Workpiece (Table or Load)

Ball Screw Pitch: 3mm Motor (encoder signal output: A/B, Z)

Encoder PPR: 2500 puls e

Revision January, 2009 6-5