Alarm Signal - Hitachi WJ200 Series Quick Reference Manual

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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
Code
05
Valid for inputs:
Required settings
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
Logic Signal Specifications" on page 4–6.
contact diagrams for different conditions are on
the next page.
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Terminal
Function Name
Symbol
AL Alarm Signal
11, 12, AL0 – AL2
C031, C032, C036
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Fault
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
"Control
The
See I/O specs on
39
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STOP
RESET
Run Stop
RUN
STOP
RESET
Trip
Fault
Alarm signal active
Description
page 3-54):
AL
CM2 11
RY
page 4-35 and 3-54):
AL
AL0 AL1 AL2
Power
Load
supply
page 4-6
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