Hitachi L2002 Alarm Signal, alarm signal becomes inactive, [AL1] and [AL2]. The signal AL is a logic, We must make a distinction between the alarm

4–43

L2002 Inverter

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

RUN

alarm signal becomes inactive.

We must make a distinction between the alarm

Fault

STOP

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 3–54):

Required settings:

C026, C036

Inverter output

AL

Notes:

terminal circuit

• By default, the relay is configured as normally

closed (C036=01). Refer to the next page for an

CM2

12

11

explanation.

•In the default relay configuration, an inverter power

loss turns ON the alarm output. the alarm signal	+	RY
remains ON as long as the external control circuit
	–
has power.

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

time delay of less than 2 seconds occurs after		Example for terminals [AL0], [AL1], [AL2]
powerup before the contact is closed.		(default output configuration shown—
• Terminals [11] and [12] are open collector outputs,		see page 3–54):
so the electric specifications of [AL] are different
		Inverter logic				AL
from the contact output terminals [AL0], [AL1],
		circuit board
[AL2].
• This signal output has the delay time (300 ms		Relay position
nominal) from the fault alarm output.		shown is for
• The relay contact specifications are in “Control		normal opera-
				AL0	AL1		AL2
Logic Signal Specifications” on page 4–6. The		tion (no alarm).
contact diagrams for different conditions are on the
next page.
	See I/O specs		Power			Load
			supply
	on page 4–6.

Operations Monitoring and