Alarm Signal - Hitachi L300P Series Instruction 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 standard
relay outputs [11] or [12], or the alarm relay
output. The most common (and default) use of the
alarm relay is for AL, thus the labeling of its
terminals. 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, AL0 – AL2
Valid for
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 [11C] –[11A] and [12C] – [12A]
use slightly smaller relays than the alarm
relay on terminals [AL0], [AL1], [AL2]. So,
the electrical specifications of the two relay
types are different.
• 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 4–8. 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 [11C]—[11A] or
[12C]—[12A]: (Requires output config-
uration—see page 3–48.)
Inverter output terminal circuit
12C 12A
24VDC
Example for terminals [AL0], [AL1], [AL2]:
(Default output configuration shown—see
page 3–48.)
Inverter output
terminal circuit
Relay position
shown during
normal running
(no alarm)
See I/O specs
on page 4–8.
4–41
L300P Inverter
Stop
RUN
STOP
RESET
Trip
Fault
Alarm signal
active
AL
11C 11A
+
L
–
AL
AL1
AL0 AL2
Power
Load
Supply