EQ2660-9R Datasheet, PDF (25/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Table 21: Safety concept leading to an SELV output circuit
Conditions Front end
DC-DC converter
Result
Nominal
supply
voltage
Mains
≤150 VAC
Minimum required grade
of insolation, to be pro-
vided by the AC-DC front
end, including mains-
supplied battery charger
Functional (i.e. there is
no need for electrical iso-
lation between the mains
supply circuit and the
DC-DC converter input
circuit)
Maximum DC Minimum required Types
output voltage safety status of the
from the front front end output
end ¹
circuit
≤150 V ²
Primary circuit
DQ
EQ
Measures required to achieve Safety status
the specified safety status of of the DC-DC
the output circuit
converter
output
circuit
Double or reinforced insula-
tion, based on 150 VAC and
DC (provided by the con-
verter) and earthed case ³
SELV circuit
Basic
≤60 V
ELV circuit
BQ, GQ
48Q
CQ
Supplementary insulation,
based on 150 VAC (provided
by the DC-DC converter)
and earthed case ³
≤75 V
Hazardous voltage 48Q
secondary circuit CQ
Supplementary insulation,
based on 150 VAC and
double or reinforced insula-
tion ⁴ (both provided by the
DC-DC converter) and
earthed case ³
Mains
≤ 250 VAC
≤ 60 V
Earthed SELV
circuit ³
BQ, GQ Functional insulation (provided
48Q,CQ by the converter)
≤ 75 V
ELV circuit
Unearthed
48Q
hazardous voltage CQ
secondary circuit
Input fuse ⁵, output suppressor
diodes ⁶, earthed output
circuit ³ and earthed ³ or non
user-accessible case
Earthed
SELV circuit
≤150 V ²
Earthed hazardous
voltage secondary
circuit ³ or earthed
ELV circuit ³
BQ, GQ Double or reinforced
48Q, CQ insulation ⁴ (provided by
DQ
the converter)
EQ
and earthed case ³
SELV circuit
Unearthed
DQ
hazardous voltage EQ
secondary circuit
Supplementary insulation, ba-
sed on 250 VAC and double
or reinforced insulation ⁴ (both
provided by the converter)
and earthed case ³
Double or reinforced
≤ 60 V
SELV circuit
BQ, 48Q Functional insulation (provi-
CQ, GQ ded by the converter)
≤120 V
≤150 V ²
TNV-2 circuit
Double or re-infor-
ced insulated un-
earthed hazardous
voltage secondary
circuit ⁷
48Q, CQ Basic insulation ⁴ (provided
DQ
by the converter)
EQ
1 _{The front end output voltage should match the specified input voltage range of the DC-DC converter.}
2 _{The maximum rated input voltage of EQ models acc. to IEC/EN 60950 is 150 V. Power-One specifies the tolerance as +12% (max. 168 V)}
3 _{The earth connection has to be provided by the installer according to IEC/EN 60950.}
4 _{Based on the maximum rated output voltage provided by the front end.}
5 _{The installer shall provide an approved fuse with the lowest rating suitable for the application in a non-earthed input conductor directly at}
the input of the DC-DC converter (see fig. Schematic safety concept). For UL’s purposes, the fuse needs to be UL-listed.
6 _{Each suppressor diode should be dimensioned such that in the case of an insulation fault the diode is able to limit the output voltage to}
SELV (<60 V), until the input fuse blows (see fig. Schematic safety concept).
7 _{Has to be insulated from earth according to IEC/EN 60950, by at least supplementary insulation, based on the maximum nominal output}
voltage from the front end.
BCD20011- G Rev AG, 12-Mar-2012
Page 25 of 26
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