4
Overview of Features and Functions Section 1-1
The S8M-CP04-RS (UL Class 2 output model) has redundant tripping circuits.
In addition to the regular abnormal current tripping function (0.5 to 3.8 A) that
is set with a parameter, there is a built-in system tripping circuit that detects
currents over 4.0 A.
Safety Functions All S8M models are equipped with a short-circuit protection fuse and thermal
fuse to provide protection.
External Outputs The S8M has 3 external outputs: the Tripping Alarm Output (TRP), Alarm Out-
put (ALM), and Over-temperature Output (TMP).
The Tripping Alarm Output is output when an abnormal current or abnormal
voltage is detected. The Alarm Output is output when there is an overcurrent,
overvoltage, undervoltage, or excessive run time. The Over-temperature Out-
put is output when the temperature exceeds the rated temperature.
Tripping Functions Using
External Signals
Branch outputs can be forcibly cut off by turning ON the External Tripping
Input (TRG).
• Tripping using the External Tripping Input can be enabled or disabled
independently for each branch output. A branch output will be cut off only
when this function is enabled.
• The External Tripping Input directly cuts off a branch output's DC circuit,
so it acts even faster than cutting off the output by turning OFF the normal
AC power supply.
• When a shutdown sequence has been set, this function can be used to
set a time lag for the branch output cutoff. (For details, refer to 2-6 Shut-
down Sequence Function.)
Additional Functions
Startup Sequence
Function
A delay can be set for the connection of the four branch outputs. When you
want to apply a startup delay to the branch output, it is not necessary to con-
struct an external sequence circuit. The inrush current can be suppressed by
applying a delay and the Power Supply Unit's capacity can be reduced. (For
details, refer to 2-5 Startup Sequence Function.)
Shutdown Sequence
Function
When an external input is used to cut off an output, the four branch outputs'
cutoff can be delayed. When you want to apply a shutdown delay to the
branch output, it is not necessary to construct an external sequence circuit.
(For details, refer to 2-6 Shutdown Sequence Function.)
Tripping Alarm
Output (TRP)
• An abnormal voltage over 28.8 V was
detected.
• A current exceeding the abnormal cur-
rent tripping value was detected.
The output status is
retained when power is
interrupted but can reset
with the reset operation.
Alarm Output
(ALM)
• A voltage below the undervoltage
alarm value was detected.
• A voltage over the overvoltage alarm
value was detected.
• A current over the overcurrent alarm
value was detected.
• The run time exceeded the run time
value.
This output can be reset
with the reset operation. If
the alarm is cleared when
the power is turned ON,
the output will be reset.
Over-tempera-
ture Output
(TMP)
A temperature exceeding the over-tem-
perature output value was detected.
The output is reset auto-
matically when the tem-
perature falls to 3°C below
the over-temperature out-
put value.
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