SJ700
2
Inverter
Oper
ati
ons
and Monitor
ing
4–47
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] 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
“Specifications of Control and Logic Connections” on
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.
Opt. Code
05
Symbol
[AL]
Valid for
Outputs
[11 to [15],
[ALx]
Required
Settings
C026, C036
Default
terminals
Relay [AL0],
[AL1], [AL2]
Run
Stop
Fault
Trip
Fault
Alarm signal
active
RUN
STOP
RESET
STOP
RESET
Contact position after initialization
Contact position inverted by C036 setting
During normal running
When an alarm occurs or
power is turned OFF
During normal running or
power is turned OFF
When an alarm occurs
AL1
AL0 AL2
AL1
AL0 AL2
AL1
AL0 AL2
AL1
AL0 AL2
Contact
Power
Run
State
AL0-
AL1
AL0-
AL2
N.C.
(after
initialize,
C036=01)
ON
Normal
Closed
Open
ON
Trip
Open
Closed
OFF
–
Open
Closed
Contact
Power
Run
State
AL0-
AL1
AL0-
AL2
N.O.
(set
C036=00)
ON
Normal
Open
Closed
ON
Trip
Closed
Open
OFF
–
Open
Closed
