Insulation Test; Series Operation; Inrush Current; Parallel Operation - Omron S8VM Product Manual

Insulation Test

When performing the test, be sure to short-circuit all the output
terminals to protect them from damage.

Inrush Current

When two or more Power Supplies are connected to the same input,
inrush current is added to the total current. Select fuses and circuit
breakers giving sufficient consideration to the fusing or operating
characteristics so that fuses will not burn and breakers will not break
due to inrush current.
Output Voltage Adjuster (V.ADJ)
Default Setting: Set at the rated voltage
Adjustable Range: Adjustable with output voltage adjuster (V.ADJ) on
the front panel of the Power Supply from 20% to 20% of the rated
output voltage ( 10% to 20% of the rated voltage for S8VM-
@@@24A@/P@)
Turning clockwise increases the output voltage and turning
counterclockwise decreases the output voltage.
The output voltage adjuster (V.ADJ) may possibly be damaged if it is
turned with unnecessary force. Do not turn the adjuster with
excessive force.
After completing output voltage adjustment, be sure that the output
capacity or output current does not exceed the rated output capacity
or rated output current.
The output voltage may increase beyond the allowable voltage range
(up to +20% of the rated voltage) depending on the operation of the
output voltage adjuster (V.ADJ). When adjusting the output voltage,
check the output voltage of the Power Supply and be sure that the
load is not damaged.
When increasing the output voltage to more than +20% of the rated
value using the output voltage adjuster (V. ADJ), the overvoltage
protection function may operate.
(S8VM-@@@24A@/P@ Only)
Turn the output voltage adjuster (V.ADJ) slowly. When decreasing the
output voltage quickly, or when adjusting the output voltage to less
than 10% of the rated value, the undervoltage alarm function may
operate.
Ripple
(S8VM-15224C Only)
The rated ripple noise voltage was measured using a measuring cir-
cuit that conforms to the JEITA standard RC-9131A.
V
S8VM
C1
C2
V
CN
Coaxial cable
V S V S
1.5 m 50
R: 50
C1: 4700 pF
C2: 22 uF
C3: 0.47 uF
Remote Sensing Function
100/150-W Models
If the S and S terminals are opened by removing the short bar, the
overvoltage protection function will be activated and the output volt-
age will be cut off.
300/600/1,500-W Models
The stability and accuracy of the output will deteriorate if the S or
S pins are open. Always connect the S and S pins.
34
Switch Mode Power Supply
Load
Oscilloscope
R
Frequency band
C3
100 MHz
S8VM

Series Operation

Two Power Supplies can be connected in series.
The ( ) voltage output can be accomplished with two Power Sup-
plies.
Series Operation
15W/30W
Correct
AC (L) +V
AC (N) V
AC (L) +V
AC (N) V
Output Voltage ( )
Correct
AC (L) V
V
AC (N)
AC (L) V
AC (N) V
Note: 1. If the load is short-circuited, a reverse voltage may be ap-
plied inside the Power Supply unit, and this may possibly
cause the deterioration or damage of the Power Supply unit.
Connect the diode as shown in the figure. Use the following
guidelines to select the diode to be connected.
Type
Dielectric strength
(V )
RRM
Forward current (I ) Twice the rated output current or
F
2. Though Power Supplies having different specifications can
be connected in series, the current flowing through the load
must not exceed the smaller rated output current.

Parallel Operation

15/30/50/100/150-W Models
The Power Supply is not designed for parallel operation.
Incorrect
AC (L)
AC (N)
AC (L)
AC (N)
300/600/1,500-W Models
If the CB pin (pin 5 on CN) and the CBG pin (pin 6 on CN) are con-
nected, the current balance function will operate and parallel opera-
tion will be possible at 80% or less of the total output capacity.
Up to 2 Power Supplies can be connected.
50W/100W/150W/300W/600W/
1,500W
Correct
AC (L) V
AC (N) V
AC (L) V
AC (N) V
Schottky Barrier diode
Twice the rated output voltage or
above
above
V
V
V
V