psa242.5-2iry Power-One, psa242.5-2iry Datasheet - Page 8

• Manufacturer Part Number: psa242.5-2iry
• Description: Psa Series Extended Positive Switching Regulators Benign
• Manufacturer: Power-One

Standards and Approvals
All switching regulators are UL recognized according to
UL 1950 and EN 60950 and UL recognized for Canada to
CAN/CSA C22.2 No. 234-M90.
The units have been evaluated for:
• Building in,
• Functional insulation from input to output and input/out-
• The use in an overvoltage category II environment,
• The use in a pollution degree 2 environment.
The switching regulators are subject to manufacturing sur-
veillance in accordance with the above mentioned UL and
CSA and with ISO 9001 standards.
Table 8: Safety concept leading to an SELV output circuit
1
2
3
4
Safety and Installation Instructions
Installation Instruction
Installation of the switching regulators must strictly follow
the national safety regulations in compliance with the enclo-
sure, mounting, creepage, clearance, casualty, markings
and segregation requirements of the end-use application.
Check for hazardous voltages before altering any connec-
tions. Connections can be made using fast-on or soldering
technique.
The input and the output circuit are not separated, i.e. the
negative path is internally interconnected! Only functional
insulation to the case.
The units should be connected to a secondary circuit.
Do not open the module.
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also: Safety
of operator accessible output circuit.
REV. SEP 17, 2003
Conditions Front end
Supply
voltage
Battery
supply,
considered
as secon-
dary circuit
Mains
The front end output voltage should match the specified input voltage range of the switching regulator.
The earth connection has to be provided 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.
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.
250 V AC
put to case,
Minimum required grade Maximum
of isolation, to be provi-
ded by the AC-DC front-
end including mains-
supplied battery charger front end
Double or Reinforced
Basic
Double or reinforced
DC output status of the front end
voltage
from the
60 V
60 V
60 V
1
Minimum required safety Measures to achieve the
output circuit
SELV circuit
Earthed SELV circuit
ELV circuit
SELV circuit
Page 8 of 11
Positive Switching Regulator
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.
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.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids is to be prevented, since the power sup-
plies are not hermetically sealed.
Protection Degree
The protection degree is IP 40.
Isolation
Electric strength test voltage between input intercon-
nected with output and case: 500 V DC, 1 s.
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
PSA Series Extended Datasheet
Switching regulator
specified safety status of the the switching
output circuit
None
None
Input fuse
circuit
case
None
4
2
and non accessible
3
and earthed output
s (Benign)
Safety status of
regulator output
Earthed SELV
circuit
Result
circuit
SELV circuit
SELV circuit