Alarm Signal - Hitachi L2002 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] 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 Alarm Signal
11, 12, AL0 – AL2
Valid for outputs:
C026, C036
Required settings:
Notes:
•
By default, the relay is configured as normally
closed (C036=01). Refer to the next page for an
explanation.
•
In the default relay configuration, an inverter power
loss turns ON the alarm output. the alarm signal
remains ON as long as the external control circuit
has power.
•
When the relay output is set to normally closed, a
time delay of less than 2 seconds occurs after
powerup before the contact is closed.
•
Terminals [11] and [12] are open collector outputs,
so the electric specifications of [AL] are different
from the contact output terminals [AL0], [AL1],
[AL2].
•
This signal output has the delay time (300 ms
nominal) from the fault alarm output.
•
The relay contact specifications are in
Logic Signal Specifications" on page
contact diagrams for different conditions are on the
next page.
Output
Function Name
State
ON
OFF
"Control
4–6. The
L200
STOP
RESET
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 3–54):
Inverter output
terminal circuit
+
–
Example for terminals [AL0], [AL1], [AL2]
(default output configuration shown—
see page 3–54):
Inverter logic
circuit board
Relay position
shown is for
normal opera-
AL0
tion (no alarm).
Power
See I/O specs
supply
on page 4–6.
4–43
Inverter
2
Stop
RUN
STOP
RESET
Trip Fault
Alarm signal active
AL
CM2 12 11
RY
AL
AL1 AL2
Load