Hitachi hitachi series inverter user manual Alarm Signal, Stop, Trip

Alarm Signal

The inverter alarm signal is active when a fault has

occurred and it is in the Trip Mode (refer to theRun diagram at right). When the fault is cleared the alarm

signal becomes inactive.

STOP

RESET

Stop

RUN

STOP

RESET

We must make a distinction between the alarm signal	Trip
AL and the alarm relay contacts [AL0], [AL1] and [AL2]. Fault		Fault
The signal AL is a logic function, which you can assign
to the open collector output terminals [11], [12], or the	Alarm signal active
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 Code Symbol

Function Name

State

Description

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)

11, 12, AL0 – AL2

C031, C032, C036

Notes:

•By default, the relay is configured as normally closed (C036=01). Refer to the next page for an explanation.

•In the default relay configuration, an inverter power loss turns ON the alarm output. the alarm signal 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 powerup before the contact is closed.

•Terminals [11] and [12] are open collector outputs, so the electric specifications of [AL] are different from the contact output terminals [AL0], [AL1], [AL2].

•This signal output has the delay time (300 ms nominal) from the fault alarm output.

•The relay contact specifications are in “Control Logic Signal Specifications” on page 4–6. The contact diagrams for different conditions are on the next page.

Example for terminal [11] (default output configuration shown see page 66):

Inverter output	AL
terminal circuit
CM2	11

RY

Example for terminal [AL0], [AL1], [AL2] (requires output configuration see page 66):

Inverter logic	AL
circuit board
AL0	AL1 AL2

Power
	Load
supply

See I/O specs on page 21,22.

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