Hitachi L300P Series User Manual

L300P Inverter
Operations
and Monitoring
4–41
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.
Code
Symbol Function Name
Output
State
Description
05 AL Alarm signal ON when an alarm has occurred and has not
been cleared
OFF when no alarm has occurred since the last
clearing of alarm(s)
Val id for
outputs:
11, 12, AL0 – AL2
Required
settings:
C026, C036
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.
Run Stop
Fault
Tr i p
Fault
Alarm signal
active
RUN
STOP
RESET
STOP
RESET
Example for terminals [11C]—[11A] or
[12C]—[12A]: (Requires output config-
uration—see page 3–48
.)
Example for terminals [AL0], [AL1], [AL2]:
(Default output configuration shown—see
page 3–48
.)
See I/O specs
on page 4–8
.
Inverter output
terminal circuit
Inverter output terminal circuit
12C 12A 11C 11A
24VDC
L
AL1
AL0 AL2
Relay position
shown during
normal running
(no alarm)
+
–
AL
AL
Power
Supply
Load

Hitachi L300P Series Specifications

General

Brand	Hitachi
Model	L300P Series
Category	Inverter
Language	English