psb243-7ir Power-One, psb243-7ir Datasheet - Page 11

• Manufacturer Part Number: psb243-7ir
• Description: Psb Series Extended Positive Switching Regulators Rugged
• Manufacturer: Power-One

REV. OCT 17, 2003
Safety of Operator Accessible Output Circuit
If the output circuit of a switching regulator is operator-ac-
cessible, it shall be an SELV circuit according to IEC/EN
60950 related safety standards
The following table shows some possible installation con-
figurations, compliance with which causes the output cir-
cuit of the switching regulator to be an SELV circuit ac-
cording to IEC/EN 60950 up to a nominal output voltage of
30 V, or 48 V if option C is fitted.
Table 9: Insulation concept leading to an SELV output circuit
1
2
3
4
5
The switching regulators are subject to manufacturing
surveillance in accordance with the above mentioned UL
and CSA and with ISO 9001 standards.
Isolation
Electric strength test voltage between input intercon-
nected with output and case: 1500 VDC, 1 s.
Conditions Front end
Supply
voltage
Battery
supply,
considered
as secon-
dary circuit
Mains
-250 V AC
The front end output voltage should match the specified input voltage range of the switching regulator.
The conductor to the Gi– terminal of the switching regulator has to be connected to earth by the installer according to the relevant
safety standard, e.g. IEC/EN 60950.
The installer shall provide an approved fuse (slow blow type with the lowest current rating suitable for the application, max. 12.5 A)
in a non-earthed input conductor directly at the input of the switching regulator. If Vo+ is earthed, insert the fuse in the Gi- line. For
UL’s purpose, the fuse needs to be UL-listed. If option C is fitted, a suitable fuse is already built-in in the Vi+ line.
The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950.
Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum
output voltage from the front end.
Minimum required grade
of isolation, to be provided DC output
by the AC-DC front end,
including mains supplied
battery charger
Double or Reinforced
Basic
Double or reinforced
Maximum
voltage
from the
front end
>60 V
>60 V
>60 V
60 V
60 V
60 V
1
Minimum required safety
status of the front end
output circuit
secondary circuit
Unearthed hazardous
voltage secondary circuit
Hazardous voltage
secondary circuit
ELV circuit
secondary circuit
lated unearthed hazardous and non accessible case
voltage secondary circuit
SELV circuit
Earthed hazardous voltage Input fuse
Earthed SELV circuit
Hazardous voltage
SELV circuit
Double or reinforced insu- Input fuse
Page 11 of 13
Positive Switching Regulators (Rugged)
However, it is the sole responsibility of the installer or user
to assure the compliance with the relevant and applicable
safety regulations.
More information is given in Technical Information: Safety
& EMC .
This test is performed as factory test in accordance with
IEC/EN 60950 and UL 1950 and should not be repeated in
the field. Power-One will not honour any guarantee claims
resulting from electric strength field tests.
2
4
PSB Series Extended Data Sheet
5
5
Switching regulator
Measures to achieve the
specified safety status of the
output circuit
None
accessible case
Input fuse
non accessible case
Input fuse
circuit
case
None
Input fuse
circuit
case
None
5
5
4
4
and non accessible
and non accessible
3
3
3
3
3
and earthed output Earthed SELV
and non
and earthed output
and unearthed,
and unearthed
5
5
5
Result
Safety status of
the switching
regulator output
circuit
SELV circuit
Earthed SELV
circuit
Unearthed SELV
circuit
circuit
SELV circuit
circuit
Unearthed SELV