ML15.121
MiniLine
12V, 1.3A, S
INGLE
P
HASE
I
NPUT
Dec. 2007 / Rev. 1.1 DS-ML15.121-EN
All parameters are specified at 12V, 1.3A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
16/20
25.4. S
ERIES
O
PERATION
The power supply can be put in series to increase the output voltage.
Fig. 25-3
Schematic for series operation
Instructions for use in series:
Earth
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
a)
It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed
150Vdc.
b)
Voltages with a potential above 60Vdc are not SELV any
more and can be dangerous. Such voltages must be installed
with a protection against touching.
c)
For serial operation use power supplies of the same type.
d)
Earthing of the output is required when the sum of the
output voltage is above 60Vdc.
Note: Avoid return voltage (e.g. from a decelerating motor or
battery) which is applied to the output terminals.
25.5. P
ARALLEL
U
SE TO
I
NCREASE
O
UTPUT
P
OWER
Several power supplies can be paralleled to increase the output power. The ML15.121 has no feature included which
balances the load current between the power supplies. Usually the power supply with the higher adjusted output
voltage draws current until it goes into current limitation. This means no harm to this power supply as long as the
ambient temperature stays below 50°C.
Fig. 25-4
Schematic for parallel operation
Instructions for parallel use:
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
a)
Use only power supplies from the same series (ML-Series).
b)
Adjust the output voltages of all power supplies to
approximately the same value (±100mV).
c)
A fuse (or diode) on the output is only required if more than
three units are connected in parallel.
d)
Ensure that the ambient temperature of the power supply
does not exceed 50°C.
