Frequency arrival signals, Oper ations and monitor ing, Al0 al2 al1 – Hitachi L2002 User Manual
Page 183
L200
2
Inverter
Oper
ations
and Monitor
ing
4–39
Frequency Arrival Signals
The Frequency Arrival group of outputs help coordinate external systems with the
current velocity profile of the inverter. As the name implies, output [FA1] turns ON
when the output frequency arrives at the standard set frequency (parameter F001).
Output [FA2] relies on programmable accel/ decel thresholds for increased flexibility.
For example, you can have an output turn ON at one frequency during acceleration, and
have it turn OFF at a different frequency during deceleration. All transitions have hyster-
esis to avoid output chatter if the output frequency is near one of the thresholds.
Option
Code
Terminal
Symbol
Function Name
Output
State
Description
01
FA1
Frequency Arrival
Type 1 – Constant
Speed
ON
when output to motor is at the set frequency
OFF
when output to motor is OFF, or in any accelera-
tion or deceleration ramp
02
FA2
Frequency Arrival
Type 2 – Over-
frequency
ON
when output to motor is at or above the FA2
threshold (C042) during accel
OFF
when output to motor is below the FA2 threshold
(C043) during decel
Valid for outputs:
11, 12, AL0 – AL2
Required settings:
(none)
Notes:
•
For most applications you will need to use only one
type of frequency arrival outputs (see examples).
However, it is possible assign both output terminals
to output functions [FA1] and [FA2].
•
For each frequency arrival threshold, the output
anticipates the threshold (turns ON early) by 1.5Hz.
•
The output turns OFF as the output frequency
moves away from the threshold, delayed by 0.5Hz.
•
The delay time of the output signal is 60 ms
(nominal).
•
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.
Example (default output configuration
shown—see page
Inverter output
terminal circuit
RY
+
–
FA1
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
FA1
Load
Power
supply
12 11
CM2