Hitachi SJ700-2 Example of use Synchronous operation, Master inverter Slave inverter

Chapter 4 Explanation of Functions

<Example of use: Synchronous operation>

Master inverter	Slave inverter
AP,BP	SAP,SBP
AN,BN	SAN,SBN
EG5	EG5
EAP,EBP	EAP,EBP
EAN,EBN	EAN,EBN

Main motor	Ｍ	Sub-motor	Ｍ
	EC		EC

On the inverter (master inverter) for the main motor, specify either the speed control or pulse train position control mode.

On the inverter (slave inverter) for the sub-motor, specify the pulse train position control mode.

<Example of settings>

-Main motor: Encoder pulse-per-revolution (PPR) setting = 1024 (pulses)

-Sub-motor: Encoder pulse-per-revolution (PPR) setting = 3000 (pulses)

-Ratio of main motor speed to sub-motor speed: 2:1

To operate the motors under the above conditions, adjust the parameters on the slave inverter as follows:

Pulse train mode setting (P013): 00 (90º-phase-shift pulse train)

Electronic gear set position selection (P019): 01 (REF)

Electronic gear ratio numerator setting (P020): 3000

Electronic gear ratio denominator setting (P021): 1024 x 2 = 2048

The table below lists the examples of the ratio of main motor speed to sub-motor speed according to the settings of "P019" to "P021" (on the assumption that the encoder pulse-per-revolution (PPR) setting of "1024" should be set on both inverters).

Electronic gear set position	REF	REF	FB	FB
	(Position	(Position	(Position feedback	(Position feedback
selection (P019)
	command side)	command side)	side)	side)
Electronic gear ratio numerator	1024	2048	1024	2048
setting (P020)
Electronic gear ratio	2048	1024	2048	1024
denominator setting (P021)
Sub-motor speed/main motor	1/2	2	2	1/2
speed

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