Hitachi L2002 用户手册

Using Intelligent Output Terminals

Oper

ations

and Monitor

ing

07

FBV

Feedback Value 
Check

ON

Transitions to ON when the inverter is in RUN 
Mode and the PID Process Variable (PV) is 
less than the Feedback Low Limit (C053)

OFF

Transitions to OFF when the PID Feedback 
Value (PV) exceeds the PID High Limit 
(C052)

Transitions to OFF when the inverter goes 
from Run Mode to Stop Mode

11, 12, AL0 – AL2

A076, C052, C053

The [FBV] is designed for implementing two-stage 
control. The PV high limit and PV low limit param-
eters, C052 and C053, do not function as process 
alarm thresholds. Terminal [FBV] does not provide 
a PID alarm function.

The example circuit for terminal [12] drives a relay 
coil. Note the use of a diode to prevent the negative-
going turn-off spike generated by the coil from 
damaging the inverter’s output transistor.

RY

+
–

Example (requires output configuration—
see page 

Inverter output 
terminal circuit

FBV

Example for terminals [AL0], [AL1], [AL2] 
(requires output configuration—
see pages 

 and 

):

AL0

AL2

AL1

Inverter logic 
circuit board

See I/O specs 
on page 

.

FBV

Load

Power

supply

12 11

CM2