Alarm Signal - Hitachi SJ100 Instruction Manual

4–30
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] or [12] 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] 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
Valid for outputs:
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
Alarm Signal ON
OFF
11, 12, AL0 – AL2
C_24, C_33
"Specifica-
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 3–38):
Inverter output
terminal circuit
H O OI L FM CM2
+
–
Example for terminals [AL0], [AL1], [AL2]
(default output configuration shown—
see page 3–38):
Inverter logic
circuit board
Relay position
shown is during
normal running
AL0
(no alarm).
Power
See I/O specs
supply
on page 4–6.
STOP
RESET
Stop
RUN
STOP
RESET
Trip Fault
Alarm signal active
AL
12 11
RY
AL
AL1 AL2
Load