Hitachi SJ700B Series Instruction Manual page 161

Chapter 4 Explanation of Functions
<Example of use: Synchronous operation>
Master inverter
Main motor
On the inverter (master inverter) for the main motor, specify either the speed control (ASR:P012=00) or
pulse train position control mode (APR:P012=01).
On the inverter (slave inverter) for the sub-motor, specify the pulse train position control mode
(APR:P012=01).
<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
selection (P019)
Electronic gear ratio numerator
setting (P020)
Electronic gear ratio
denominator setting (P021)
Sub-motor speed/main motor
speed
AP,BP
AN,BN
EG5
EAP,EBP
EAN,EBN
Ｍ
EC
REF
(Position
command side)
1024
2048
1/2
SAP,SBP
SAN,SBN
EG5
Sub-motor
REF
(Position (Position feedback
command side)
2048
1024
2
4 - 102
Slave inverter
EAP,EBP
EAN,EBN
Ｍ
EC
FB FB
(Position feedback
side) side)
1024 2048
2048 1024
2 1/2