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■ Mounting
Standard mounting with DIN rail
Standard mounting with S82Y-VS30P
Note: The Side-mounting Bracket can be mounted from either side.
Mounting facing horizontally with S82Y-VS30P
Note: 1. Improper mounting will interfere with heat dissipation and may
occasionally result in deterioration or damage of internal parts.
Use the product within the derating curve for the mounting direc-
tion that is used. Do not use the Power Supply mounted in any
way not shown above.
2. Use a mounting bracket (S82Y-VS30P, sold separately) when
the Product is mounted facing horizontally.
3. Heat dissipation will be adversely affected. When the Product is
mounted facing horizontally, always place the side with the label
facing upward.
4. Use PFP-M End Plates on the top and bottom of the Power Sup-
ply when mounting facing horizontally on a DIN rail.
■ Overload Protection
The Power Supply is provided with an overload protection function
that protects the power supply from possible damage by overcurrent.
When the output current rises above 105% min. of the rated current,
the protection function is triggered, decreasing the output voltage.
When the output current falls within the rated range, the overload
protection function is automatically cleared.
15-W Models
0
50
100
Output current (%)
The values shown in the above diagrams are for reference only.
Note: 1. Internal parts may occasionally deteriorate or be damaged if a
short-circuited or overcurrent state continues during operation.
2. Internal parts may possibly deteriorate or be damaged if the
Power Supply is used for applications with frequent inrush cur-
rent or overloading at the load end. Do not use the Power Supply
for such applications.
Horizontal mounting with DIN rail
Horizontal mounting with S82Y-VS30P
S82Y-VS30P
Side with label
30-W Models
Intermittent
operation
0
50
100
Output current (%)
■ Overvoltage Protection
Consider the possibility of an overvoltage and design the system so
that the load will not be subjected to an excessive voltage even if the
feedback circuit in the Power Supply fails. When an excessive volt-
age that is approximately 130% of the rated voltage or more is out-
put, the output voltage is shut OFF. Reset the Power Supply by
turning it OFF for at least three minutes and then turning it back ON
again.
+30%
(approx.)
+15%
Variable range
Rated output
voltage
−10%
0V
The values shown in the above diagram is for reference only.
Note: 1. Do not turn ON the power again until the cause of the overvolt-
age has been removed.
2. The overvoltage protection of the S8VS-015@@ uses a zener di-
ode clamp. The output voltage will be clamped at approx. 140%
or higher of the rated output voltage (approx. 140% to 190%). If
the internal feedback circuit is destroyed by any chance, the
load may be destroyed by the clamped output voltage (approx.
140% to 190% of the rated output voltage). The power Supply
will not restart if the output is turned OFF by the overvoltage pro-
tection operation. If this occurs, replace the Power Supply.
■ Inrush Current, Start Up Time,
Output Hold Time
Input ON
AC input
voltage
Inrush current on input application
AC input
current
Output
voltage
Start up time (1,000 ms max.)
■ Undervoltage Alarm Indication
LED (DC LOW red) lights to warn of output voltage drop.
Detection voltage is set to approx. 80% (75 to 90%) of the rated out-
put voltage.
Note: This function monitors the voltage at the power supply output termi-
nals. To check actual voltage, measure voltage on the load side.
■ Reference Values
Item
Reliability (MTBF)
Life expectancy
Note: Refer to page 15 for definitions of MTBF and life expectancy.
Switch Mode Power Supply
Overvoltage protection
operating
Input OFF
90%
Hold time
(20 ms min.)
Value
15 W: 610,800 hrs, 30 W: 656,400 hrs
10 yrs. min.
S8VS
96.5%
9
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