Hitachi SJ-FB - Manual (Page 10)

10
Chapter 2 OUTLINE OF SJ-FB
This manual describes the option board SJ-FB for the SJ300 series inverter.
This SJ-FB board, installed in an SJ300 inverter, detects the rotation speed of a motor by
accepting pulses from a shaft-mounted motor encoder, achieving highly accurate speed
regulation.
This SJ-FB board can also be used to control motor stop position by inputting 90 degree
out-of-phase (quadrature) pulses, as well as for synchronized operation between multiple
inverters (master/slave or electronic gear), orientation function, and external torque limit input
function.
PWM M
EC
Current
control
Torque
limiter
Speed
control
Inside
setting
LAD
Turn
several
detection Position
detection
Zero speed
detection
Speed deviation
excessive signal
Position
control
Orientation
control
SJ-FB
Inverter main body
EAP,EAN
EBP,EBN
EZP,EZN
EP5,EG5
AP,AN
BP,BN
DSE ZS
POK
LAC
PCLR
ORT
SAP,SAN
SBP,SBN
TH
STAT
Figure 2-1
Function Block Diagram