Hitachi SJ300 Series Alarm Signal

4–48

Using Intelligent Output Terminals

Operations and Monitoring

Alarm Signal

The inverter alarm signal is active when a fault has

occurred and it is in the Trip Mode (refer to the

STOP

diagram at right). When the fault is cleared the

Run

RESET

Stop

alarm signal becomes inactive.

RUN

We must make a distinction between the alarm

STOP

signal AL and the alarm relay contacts [AL0],

Fault

RESET

[AL1] and [AL2]. The signal AL is a logic

Trip

Fault

function, which you can assign to the open collec-

tor output terminals [11] to [15], or the relay

Alarm signal

outputs. The most common (and default) use of

active

the relay is for AL, thus the labeling of its termi-

nals. Use an open collector output (terminals [11] to [15]) for a low-current logic signal inter-

face or to energize a small relay (50 mA maximum). Use the relay output to interface to higher

voltage and current devices (10 mA minimum).

Opt.

Symbol

Function Name

Output

Description

Code

State

05

AL

Alarm signal

ON

when an alarm has occurred and has not

been cleared

OFF

when no alarm has occurred since the last

clearing of alarm(s)

Valid for

11, 12, 13, 14, 15,

Example for terminals [11] to [15]:

outputs:

AL0 – AL2

(Requires output configuration—

see page 3–53.)

Required

C026, C036

Inverter output

settings:

AL

terminal circuit

Notes:

• When the alarm output is set to normally

14

13

11

closed, a time delay of less than 2 seconds

occurs until the contact is closed when the

15

CM2

12

power is turned ON.

•Terminals [11] – [15] are open collector

outputs, so the electrical specifications of

[AL] are different from the contact output

terminals [AL0], [AL1], [AL2].

RY

+

•

When the inverter power supply is turned

–

OFF, the alarm signal output is valid as long

as the external control circuit has power.

•

Example for terminals [AL0], [AL1], [AL2]:

This signal output has the delay time (300ms

nominal) from the fault alarm output.

(Default output configuration shown—see

page 3–53.)

•

The relay contact specifications are in

“Specifications of Control and Logic

Inverter output

Connections” on page 4–9. The contact

terminal circuit

AL

diagrams for different conditions are on the

next page.

Relay position

shown during

normal running

AL1

(no alarm)

AL0

AL2

See I/O specs

Power

Load

Supply

on page 4–9.