Hitachi SJ100 Alarm Signal, alarm signal becomes inactive, [AL1] and [AL2]. The signal AL is a logic, We must make a distinction between the alarm

4–30

Using Intelligent Output Terminals

Operations and Monitoring

Alarm SignalThe inverter alarm signal is active when a fault has

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

STOP

Run

RESET

Stop

diagram at right). When the fault is cleared the

RUN

alarm signal becomes inactive.

STOP

We must make a distinction between the alarm

Fault

RESET

signal AL and the alarm relay contacts [AL0],

Trip

Fault

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

function, which you can assign to the open collec-

Alarm signal active

tor output terminals [11] or [12] or the relay

outputs. The most common (and default) use of the relay is for AL, thus the labeling of

its terminals. Use an open collector output (terminal [11] or [12]) for a low-current logic

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

interface to higher voltage and current devices (10 mA minimum).

Option

Terminal

Function Name

Output

Description

Code

Symbol

State

05

AL

Alarm Signal

ON

when an alarm signal has occurred and has not

been cleared

OFF

when no alarm has occurred since the last

clearing of alarm(s)

Valid for outputs:

11, 12, AL0 – AL2

Example for terminal [11] or [12] (requires

output configuration—see page 3–38):

Required settings:

C_24, C_33

Inverter output

AL

Notes:

terminal circuit

• When the alarm output is set to normally closed, a

time delay of less than 2 seconds occurs until the

H

O

OI

L

FM

CM2

12

11

contact is closed when the power is turned ON.

• Terminals [11] and [12] are open collector outputs,

so the electric specifications of [AL] are different

+

from the contact output terminals [AL0], [AL1],

–

RY

[AL2].

•When the inverter power supply is turned OFF, the

alarm signal output is valid as long as the external		Example for terminals [AL0], [AL1], [AL2]
control circuit has power.		(default output configuration shown—
• This signal output has the delay time (300 ms		see page 3–38):
nominal) from the fault alarm output.
		Inverter logic				AL
• The relay contact specifications are in “Specifica-
		circuit board
tions of Control and Logic Connections” on
page 4–6. The contact diagrams for different condi-		Relay position
tions are on the next page.		shown is during
		normal running
		(no alarm).		AL0	AL1		AL2
	See I/O specs		Power			Load
			supply
	on page 4–6.