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 , , or the
The most common (and default) use of the relay is for AL, thus the labeling of its terminals.
Use an open collector output (terminal  or ) 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).
Valid for inputs:
By default, the relay is configured as normally
closed (C036=01). Refer to the next page for an
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  and  are open collector
outputs, so the electric specifications of [AL] are
different from the contact output terminals [AL0],
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.
11, 12, AL0 – AL2
when an alarm signal has occurred and has not
when no alarm has occurred since the last clearing
Example for terminal  (default output
configuration shown see page 59):
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration see page 59):
See I/O specs on
Alarm signal active