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
18/20
25.9. F
UNCTIONAL
E
ARTH
T
ERMINAL
From a safety standpoint, the unit is designed according to the requirements for Protection Class 2 which does not
require an earth connection. However, connecting the Functional Earth terminal can be beneficial to gain a high EMI
immunity.
Symmetrical spikes or fast transients on the input side can be conducted directly to earth by the built-in filter
capacitors. The magnitude of such spikes or fast transients on the output side caused by the input are much smaller
compared to not connecting the FE terminal to ground.
Therefore, we recommend to connect the FE terminal too ground.
Fig. 25-5
Functional earth terminal connected to
earth
Fig. 25-6
Functional earth terminal not connected to
earth
Surge
Y
X
L
N
FE
Power Supply
+
-
Surge
X
L
N
Power Supply
+
-
24V
Spike
25.10. O
PERATION ON
T
WO
P
HASES
The power supply can be used on two phases of a three-phase-system
Instructions for two phase operation:
a) A phase to phase connection is allowed as long as the supplying voltage is below 240V
+10%
.
b) Use a fuse or a circuit breaker to protect the N input. The N input is internally not protected and is in this
case connected to a hot wire. Appropriate fuses or circuit breakers are specified in section 25.7 “External
Input Protection”.
Fig. 25-7
Schematic for two phase operation
240V
+
10%
ma
x.
Fuse
L2
L1
L3
L
N
FE
Power Supply
AC
DC
internal
fuse
