Hitachi SJ7002 Series Instruction Manual page 208

Alarm Signal
Opt. Code
[AL]
Symbol
[11 to [15],
Valid for
[ALx]
Outputs
Required
C026, C036
Settings
Default
Relay [AL0],
[AL1], [AL2]
terminals
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The inverter Alarm Signal is active when a fault
has occurred and it is in the Trip Mode (refer to the
05
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] to [15], or the relay
outputs. The most common (and default) use of
the relay is for AL, thus the labeling of its termi-
nals. Use an open collector output (terminals [11] to [15]) for a low-current logic signal inter-
face 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 following:
• 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] – [15] are open collector outputs, so the electrical 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 (300ms nominal) from the fault alarm output.
• The relay contact specifications are in
page 4–9. The contact diagrams for different conditions are on the next page.
The alarm output terminals operate as shown below (left) by default. The contact logic can be
inverted as shown (below right) by using the parameter setting C036. The relay contacts
normally open (N.O.) and normally closed (N.O.) convention uses "normal" to mean the
inverter has power and is in Run or Stop Mode. The relay contacts switch to the opposite
position when it is in Trip Mode or when input power is OFF.
Contact position after initialization
During normal running
AL1
AL0 AL2
Run
Contact Power
State
N.C. ON Normal
(after
ON Trip
initialize,
C036=01)
OFF –
"Specifications of Control and Logic Connections" on
When an alarm occurs or During normal running or
power is turned OFF power is turned OFF
AL1
AL0 AL2
AL0- AL0-
Contact
AL1 AL2
Closed Open
Open Closed
C036=00)
Open Closed
SJ700
STOP
RESET
Run
Fault
Trip
Contact position inverted by C036 setting
When an alarm occurs
AL1
AL0 AL2 AL0 AL2
Run
Power
State
N.O. ON Normal
(set
ON Trip
OFF –
4–47
Inverter
2
Stop
RUN
STOP
RESET
Fault
Alarm signal
active
AL1
AL0- AL0-
AL1 AL2
Open Closed
Closed Open
Open Closed