Hitachi L2002 Instruction Manual page 192

4–48
Using Intelligent Output Terminals
Option Terminal
Code Symbol
07 FBV
Valid for outputs:
Required settings:
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.
Output
Function Name
State
Feedback Value ON
Check
OFF
11, 12, AL0 – AL2
A076, C052, C053
Description
•
Transitions to ON when the inverter is in RUN
Mode and the PID Process Variable (PV) is
less than the Feedback Low Limit (C053)
•
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
Example (requires output configuration—
see page 3–54):
Inverter output
terminal circuit
Example for terminals [AL0], [AL1], [AL2]
(requires output configuration—
4–36
see pages and 3–54):
Inverter logic
circuit board
AL0
Power
See I/O specs
supply
on page 4–6.
FBV
CM2 12 11
+
RY
–
FBV
AL1 AL2
Load