Hitachi L100 - Manual (Page 113)

Using Intelligent Output Terminals
Oper
ati
ons
and M
oni
to
ri
ng
4–22
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 collector output termi-
nals 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).
NOTE: The relay contact specifications are in the connector input/output specifications
on page 4–5. The contact diagrams for different conditions are on the next page.
Run Stop
RUN RUN RUN RUN
STOP STOP STOP STOP
RESET
Trip
Fault
STOP STOP STOP STOP
RESET
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: C33
Notes:
•
When the alarm output is set to normally closed, a
time delay occurs until the contact is closed when
the power is turned on. Therefore, when the alarm
contact output is to be used, set a delay of about 2
seconds when the power is turned on.
• Terminals 11 and 12 are open collector outputs, so
the electric specification of [AL] is different from
the contact output terminals AL0, AL1, AL2.
• The logic sequence of terminals 11 and 12 is the
same as AL0-AL2.
• See the description of AL1, AL2, and AL0.
• 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 (300ms
nominal) from the fault alarm output.
CM2 11 12 FM H OI O L
Example for terminal 11 or 12:
AL
RY
+
–
Inverter output
terminal circuit
AL0
Example for terminals AL0, AL1, AL2:
Connector
inverter logic
circuit board
AL1 AL2
Power
Supply
Load
AL
See I/O specs on page 4–5.
Relay position shown is
during normal running
(no alarm).
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