Frequency arrival signals – Hitachi SJ100 User Manual
Page 143
Using Intelligent Output Terminals
Oper
ations
and Monitor
ing
4–26
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 F_01).
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.
NOTE: The example circuit in the table above 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.
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 set
frequency thresholds for, even if in acceleration
or deceleration ramps
OFF
when output to motor is OFF, or during accelera-
tion or deceleration before the respective thresh-
olds are crossed
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).
See I/O specs
on page
.
12 11
L
H O OI
FM CM2
Example (default output configuration
shown—see page
Inverter output
terminal circuit
RY
+
–
FA1