Hitachi CONVENTION 14 instruction manual 4 44

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 terminal
[11] 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]) 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
Terminal
Symbol FunctionName State Description
ON when an alarm signal has occurred and has not
been cleared
05 AL Alarm Signal
OFF when no alarm has occurred since the last
clearing of alarm(s)
Validfor inputs: 11, AL0 – AL2
Requiredsettings C026, C036
Notes:
xBy default, the relay is configured as normally
closed (C036=01). Refer to the next page for an
explanation.
xIn 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.
xWhen the relay output is set to normally closed,
a time delay of less than 2 seconds occurs after
powerup before the contact is closed.
xTerminal [11] is an open collector output, so the
electric specifications of [AL] are different from
the contact output terminals [AL0], [AL1],
[AL2].
xThis signal output has the delay time (300 ms
nominal) from the fault alarm output.
xThe 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 3-54):
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration – see page 4-35 and 3-54):
See I/O specs on page 4-6
RY
Inverter output
terminal circuit
CM2 11
AL
AL1
Power
supply Load
AL0 AL2
Inverter logic
circuit board
A
L
Run Stop
RUN
STOP
RESET
Trip
STOP
RESET
Fault Fault
A
larm signal active
444
Operations and
Monitoring
4 44
Operations and
Monitoring