DP3020-9R Datasheet, PDF (22/24 Pages) Power-One – 90 - 195 Watt DC-DC Converters

P Series Data Sheet
90 – 195 Watt DC-DC Converters
Safety of Operator-Accessible Output Circuits
If the output circuit of a DC-DC converter is operator
accessible, it shall be an SELV circuit according to the IEC/
EN 60950 related safety standards.
The following table shows some possible installation
configurations, compliance with which causes the output
circuit of the DC-DC converter to be an SELV circuit
according to IEC/EN 60950 up to a configured output voltage
(sum of nominal voltages if in series or +/– configuration) of
35 V.
However, it is the sole responsibility of the installer to ensure
the compliance with the relevant and applicable safety
regulations.
Use fuses and earth connections as per table below. See also
Installation Instructions.
Table 15: Safety concept leading to an SELV output circuit
Conditions Front end
Nominal
supply
voltage
Minimum required grade
of insolation, to be pro-
vided by the AC-DC front
end, including mains
supplied battery charger
Maximum DC
output voltage
from the front
end ¹
Mains
≤250 VAC
Functional (i.e. there is
no need for electrical iso-
lation between the mains
supply circuit and the
DC-DC converter input
circuit)
≤168 V
Basic
Minimum required safety
status of the front end
output circuit
DC-DC converter
Measures to achieve the
specified safety status of the
output circuit
Result
Safety status
of the DC-DC
converter
output circuit
Primary circuit (The nominal
voltage between any input
pin and earth shall not ex-
ceed 250 VAC or 240 VDC.)
Double or reinforced insula-
tion, based on 250 VAC and
240 VDC (provided by the
DC-DC converter) and
earthed case ²
SELV circuit
Earth related hazardous
voltage secondary circuit
(The nominal voltage
between any input pin and
earth shall not exceed
250 VAC or 240 VDC.)
Double or reinforced insula-
tion, based on the maximum
nominal output voltage from
the front end (both provided
by the DC-DC converter) and
earthed case ²
Unearthed hazardous
voltage secondary circuit
Supplementary insulation,
based on 250 VAC and DC
and double or reinforced
insulation, based on the
maximum nominal output
voltage from the front end
(both provided by the DC-DC
converter) and earthed case ²
Supplementary
Unearthed hazardous
voltage secondary circuit ³
Basic insulation, based on
250 VAC and DC (provided
by the DC-DC converter)
1 _{The front end output voltage should match the specified input voltage range of the DC-DC converter. The maximum rated input}
voltage of EP types is 150 V according to IEC/EN 60950.
2 _{The earth connection has to be procided by the installer according to the relevant safety standards, e.g., IEC/EN 60950.}
3 _{Has to be insulated from earth by at least supplementary insulation (by the installer) according to the relevant safety standards,}
e.g. IEC/EN 60950, based on the maximum nominal output voltage from the front end. If the converter case is accessible, it
has to be earthed or the front end output circuit has to be insulated from the converter case by at least basic insulation, based
on the maximum nominal mains supply voltage.
~
Mains
~
AC-DC
front
end
Fig. 25
Schematic safety concept
BCD20010-G Rev AG, 05-May-2014
Max. 250 VAC or 240 VDC
Battery
Max. 250 VAC or 240 VDC
Fuse
Fuse
10052a
DC-DC
con-
verter
+
SELV
–
Earth
connection
MELCHER
The Power Partners.
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