Hitachi SJ100 Frequency Arrival Signals, Frequency Arrival, frequency arrives

4–26

Using Intelligent Output Terminals

Frequency Arrival Signals

Operations and Monitoring

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 hysteresis to avoid output chatter if the output frequency is near one of the thresholds.

Option

Terminal

Function Name

Output

Description

Code

Symbol

State

01

FA1

Frequency Arrival

ON

when output to motor is at the set frequency

Type 1 – Constant

OFF

when output to motor is OFF, or in any accelera-

Speed

tion or deceleration ramp

02

FA2

Frequency Arrival

ON

when output to motor is at or above the set

Type 2 – Over-

frequency thresholds for, even if in acceleration

frequency

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

Example (default output configuration

shown—see page 3–38):

Required settings:

(none)

Notes:

Inverter output

FA1

• For most applications you will need to use only one

terminal circuit

type of frequency arrival outputs (see examples).

However, it is possible assign both output terminals

H

O

OI

L

FM

CM2

12

11

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		See I/O specs	+	RY
	moves away from the threshold, delayed by 0.5Hz.		–
•		on page 4–6.
	The delay time of the output signal is 60 ms
	(nominal).

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.