Alarm Signal - Hitachi SJ300 Series Instruction Manual

4–48
Using Intelligent Output Terminals

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 collec-
tor output terminals [11] to [15], or the relay
outputs. The most common (and default) use of
the relay is for AL, thus the labeling of its termi-
nals. Use an open collector output (terminals [11] to [15]) for a low-current logic signal inter-
face or to energize a small relay (50 mA maximum). Use the relay output to interface to higher
voltage and current devices (10 mA minimum).
Opt.
Symbol Function Name
Code
05 AL Alarm signal
11, 12, 13, 14, 15,
Valid for
AL0 – AL2
outputs:
C026, C036
Required
settings:
Notes:
• When the alarm output is set to normally
closed, a time delay of less than 2 seconds
occurs until the contact is closed when the
power is turned ON.
• Terminals [11] – [15] are open collector
outputs, so the electrical specifications of
[AL] are different from the contact output
terminals [AL0], [AL1], [AL2].
• When the inverter power supply is turned
OFF, the alarm signal output is valid as long
as the external control circuit has power.
• This signal output has the delay time (300ms
nominal) from the fault alarm output.
• The relay contact specifications are in
"Specifications of Control and Logic
Connections" on page 4–9. The contact
diagrams for different conditions are on the
next page.
STOP
RESET
Run
Fault
Output
Description
State
ON when an alarm has occurred and has not
been cleared
OFF when no alarm has occurred since the last
clearing of alarm(s)
Example for terminals [11] to [15]:
(Requires output configuration—
see page 3–53.)
Inverter output
terminal circuit
Example for terminals [AL0], [AL1], [AL2]:
(Default output configuration shown—see
page 3–53.)
Inverter output
terminal circuit
Relay position
shown during
normal running
(no alarm)
See I/O specs
on page 4–9.
Stop
RUN
STOP
RESET
Trip
Fault
Alarm signal
active
AL
14 13 11
CM2
15 12
+
RY
–
AL
AL1
AL0 AL2
Power
Load
Supply