Alarm Signal - Hitachi L100 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 open collec-
tor output terminals [11] or [12]. The relay is
dedicated to the function AL, thus the labeling of its terminals. Use an open collector
output (terminal [11] or [12]) 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 Terminal
Code Symbol
05 AL Alarm Signal
11, 12
Valid for outputs:
C_33
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 and 12 are open collector outputs, so
the electric 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 (300 ms
nominal) from the fault alarm output.
•
The relay contact specifications are in
tions of Control and Logic Connections" on
page 4–6. The contact diagrams for different condi-
tions are on the next page.
Output
Function Name
State
ON
OFF
"Specifica-
L100 Inverter
Run
Fault
Description
when an alarm signal has occurred and has not
been cleared
when no alarm has occurred since the last
clearing of alarm(s)
Example for terminal [11] or [12] (requires
output configuration—see page 3–36):
Inverter output
terminal circuit
H O OI L
+
Example for terminals [AL0], [AL1], [AL2]
(default output configuration shown—
see page 3–36):
Inverter logic
circuit board
Relay position
shown is during
normal running
AL0
(no alarm).
Power
See I/O specs
supply
on page 4–6.
4–27
STOP
RESET
Stop
RUN
STOP
RESET
Trip Fault
Alarm signal active
AL
FM CM2 12 11
RY
–
AL
AL1 AL2
Load