Hitachi L2002 - Manual (Page 192)

Using Intelligent Output Terminals
Oper
ations
and Monitor
ing
4–48
Option
Code
Terminal
Symbol
Function Name
Output
State
Description
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
Valid for outputs: 11, 12, AL0 – AL2
Required settings: A076, C052, C053
Notes:
•
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
3–54 ):
Inverter output
terminal circuit FBV
Example for terminals [AL0], [AL1], [AL2]
(requires output configuration—
see pages
4–36 and 3–54 ):
AL0 AL2 AL1
Inverter logic
circuit board
See I/O specs
on page
4–6 .
FBV
Load
Power
supply
12 11 CM2