Hitachi L2002 - Manual (Page 187)

L200
2
Inverter
Oper
ations
and Monitor
ing
4–43
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
Trip
Fault
Fault
Alarm signal active
STOP
RESET
STOP
RESET
RUN
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: C026, C036
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 “Control
Logic Signal Specifications” on page 4–6 . The
contact diagrams for different conditions are on the
next page.
RY
+
–
Example for terminals [AL0], [AL1], [AL2]
(default output configuration shown—
see page
3–54 ):
Relay position
shown is for
normal opera-
tion (no alarm).
Example for terminal [11] or [12] (requires
output configuration—see page
3–54 ):
AL0 AL2 AL1
Inverter logic
circuit board
Inverter output
terminal circuit
See I/O specs
on page
4–6 .
AL
AL
Load
Power
supply
12 11 CM2