Alarm Signal - Hitachi WJ200-001S Quick Reference Manual

Alarm Signal

The inverter alarm signal is active when a fault has
occurred and it is in the Trip Mode (refer to the
diagram at right). When the fault is cleared the alarm
signal becomes inactive.
We must make a distinction between the alarm signal
AL and the alarm relay contacts [AL0], [AL1] and [AL2].
The signal AL is a logic function, which you can assign
to the open collector output terminals [11], [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
Code Symbol

AL
Valid for inputs:
Required settings
Notes:
 By default, the relay is configured as normally
closed (=). 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 25. The
contact diagrams for different conditions are on
the next page.
Function Name
Alarm Signal
11, 12, AL0 – AL2
, , 
State
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)
Example for terminal [11] (default output
configuration shown see
Inverter output
terminal circuit
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration see
Inverter logic
circuit board
See I/O specs on
42
STOP
RESET
Run
RUN
STOP
RESET
Trip
Fault
Alarm signal active
Description
page 69):
AL
CM2 11
RY
page 69):
AL
AL0 AL1 AL2
Power
Load
supply
page 24, 25.
Stop
Fault