Alarm signal, Oper ations and monitor ing, Al0 al2 al1 – Hitachi SJ100 User Manual
Page 147
Using Intelligent Output Terminals
Oper
ations
and Monitor
ing
4–30
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).
RUN
STOP
RESET
STOP
RESET
Run
Stop
Trip
Fault
Fault
Alarm signal active
Option
Code
Terminal
Symbol
Function Name
Output
State
Description
05
AL
Alarm Signal
ON
when an alarm signal has occurred and has not
been cleared
OFF
when no alarm has occurred since the last
clearing of alarm(s)
Valid for outputs:
11, 12, AL0 – AL2
Required settings:
C_24, C_33
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.
RY
+
–
Example for terminals [AL0], [AL1], [AL2]
(default output configuration shown—
see page
Relay position
shown is during
normal running
(no alarm).
12 11
L
H O OI
FM CM2
Example for terminal [11] or [12] (requires
output configuration—see page
AL0
AL2
AL1
Inverter logic
circuit board
Inverter output
terminal circuit
See I/O specs
on page
.
AL
AL
Load
Power
supply