Overload Protection; Overvoltage Protection - Omron S8VS Product Manual

Overload Protection

The load and the power supply are automatically protected from
overcurrent damage by this function.
Overload protection is activated if the output current rises above
105% of the rated current.
When the output current returns within the rated range overload
protection is automatically cleared.
15-W Models
0 50 100
Output current (%)
60 W Models
Intermittent operation
0 50 10 0
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
current or overloading at the load end. Do not use the Power
Supply for such applications.
Peak Output Current (S8VS-48024 only)
The peak current must satisfy the following conditions.
Input voltage range: 200 to 240 VAC
Peak current value: 30 A max.
Peak current pulse width: 2 s max.
Cycle: 60 s min.
Note: 1. Two seconds after the peak current is reached, the peak
current limiting function operates to stop the peak current
flow.
2. It takes 60 seconds for the peak current to be able to flow
again.
3. The peak current limiting function prevents the peak current
from flowing at 100 to 120 VAC.
60 s min.
2 s
Overcurrent
protectionpoint
Output current
0 A

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.
This power supply automatically protects itself and the load from
overvoltage.
When an excessive voltage that is approximately 130% of the rated
voltage or more is output, the output voltage is shut OFF.
Reset the input power by turning it OFF for at least three minutes and
then turning it back ON again.
8
30-W Models
Intermittent
operation
0 50 100
Output current (%)
120 W/240 W/480 W Models
0 50 100
Output current (%)
Peak current limit
Peak current
condition
+30%
(approx.)
+15%
Variable range
Rated output
voltage
−10%
0 V
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
overvoltage has been removed.
2. The overvoltage protection of the S8VS-01524 uses a zener
diode 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 protection operation. If this occurs,
replace the Power Supply.
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
output voltage.
Note: This function monitors the voltage at the power supply output
terminals. To check actual voltage, measure voltage on the load
side.
Reference Values (15 W to 480 W Models)
Item Value Definition
MTBF stands for Mean Time
Between Failures, which is calculat-
15 W to 240 W:
ed according to the probability of
Reliability 135,000 hrs min.
accidental device failures, and
(MTBF) 480 W:
indicates reliability of devices.
60,000 hrs min.
Therefore, it does not necessarily
represent the life of the Product.
The life expectancy indicates
average operating hours under the
ambient temperature of 40°C and
Life expect-
10 yrs. min. a load rate of 50%. Normally this is
ancy
determined by the life expectancy
of the built-in aluminum electrolytic
capacitor.
Inrush Current, Startup Time, Output
Hold Time
Input ON
AC input
voltage
Inrush current on input application
AC input
current
Output
voltage
Startup time (1,000 ms max.)
S8VS
Overvoltage protection
operating
Input OFF
96.5%
90%
Hold time
(20 ms min.)