Power Supply
Technical Information
5
Power
supp
lies
Note 1. Loads with built-in DC-DC converters (PLCs, digital panel meters and other electronic devices) and capacitive loads are connected, the overcurrent protection
function will be activated at startup, which may prevent the Power Supply’s output from turning ON.
Note 2. Continuing to use the Power Supply with an output short-circuit or in overcurrent status may cause the internal parts to be deteriorated or damaged.
Note 3. If a load short-circuit occurs, the actual drop in voltage depends on the impedance of the load lines being used.
Note 4. Even if the inclination of the drop characteristics is the same, the actual characteristics (output current/voltage, etc.) depend on the model.
Note 5. Specific precautions apply to some models. For details, refer to the separate information in the datasheet for each model.
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Overvoltage Protection
Main applicable models: S82J (100 W/5 V, 24 V output,
300 W, 600 W), S8TS,
S8VM, S8VS, S8T-DCBU-02
This protection function detects overvoltage and interrupts
output to prevent sensors or other loads from being subjected to
excessive voltage due to failure of the Power Supply’s internal
recovery circuit.
To resume operation, turn OFF the input power, and wait for a
fixed period of time before turning ON the input power again.
Note 1. When the overvoltage protection circuit operates, the Power Supply
itself may be malfunctioning. When restarting the input power after the
overvoltage protection circuit has operated, turn the input power ON
with the load line disconnected and check the output voltage.
Note 2. The overvoltage protection circuit may operate if surge or other external
overvoltage (e.g., from the load) is applied to the output side.
Models with the Zener-diode clamp system do not restart after
the protection circuit operates. Send the product for repair.
* For further details, refer to the datasheet for individual models.
Overcurrent drop char-
acteristics
Relationship between output voltage
and output current
Trend
Main models
Voltage/current drop
Intermittent operation
When a voltage drop occurs, the output current
also gradually drops, and the load of the Power
Supply itself is reduced (automatic recovery)
using intermittent output when the voltage drops
to a certain level or lower.
S82J
10 W, 25 W
Inverted L voltage drop
Intermittent operation
When a voltage drop occurs, the output current
remains essentially constant. The load of the
Power Supply itself is reduced (automatic recov-
ery) using intermittent output when the voltage
drops to a certain level or lower.
S8VS
30 W, 60 W, 90 W, 120 W, 180 W
S8VM
50 W, 100 W, 150 W (5 V)
Gradual current in-
crease/
voltage drop
Intermittent operation
When a voltage drop occurs, the output current
increases as the voltage drops, maintaining con-
stant power, and the load of the Power Supply
itself is reduced (automatic recovery) using
intermittent output when the voltage drops to a
certain level or lower.
S82J
50 W, 100 W (24 V)
S82K
30 W, 50 W
S8VM
15 W, 30 W
Inverted L voltage drop
Shut off
When a voltage drop occurs, the output current
remains essentially constant. If, however, the
overcurrent status continues for longer than a
fixed time, the output will be interrupted and the
power will need to be turned ON again to
recover.
S82J
600W
Intermittent operation
0
100
50
Output current (%)
Output voltage (V)
50
0
100
Intermittent operation
Output current (%)
Output voltage (V)
50
0
100
Intermittent operation
Output current (%)
Output voltage (V)
50
Output interrupted
0
100 Output current (%)
Output voltage (V)
Output voltage (V)
Overvoltage operation
Voltage adjustable
range
Rated output
voltage
0 V
