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Global Solutions Personal Focus
General
The SR250K has been specifically designed as a float battery charger in motor homes and the 12V model
has no cooling fan for reduced noise levels during operation. It must be installed with adequate ventilation
with an ambient of less than 35°C.
The 24V model may be used up to 50°C ambient.
Connection polarity
It is critical to check the polarity carefully when connecting DC devices.
The SR250K has an internal fuse
which needs to be replaced if the battery is connected in reverse. Usually, however, a reverse polarity con-
nection results in instant destruction of the device, especially if there is a battery involved.
Safety
The user is responsible for ensuring that input and output wiring segregation complies with local standards
and that in the use of the equipment, access is confined to operators and service personnel. A low resis-
tance earth connection is essential to ensure safety and additionally, satisfactory EMI suppression (see be-
low).
HAZARDOUS VOLTAGES EXIST WITHIN A POWER SUPPLY ENCLOSURE AND ANY REPAIRS MUST
BE CARRIED OUT BY A QUALIFIED SERVICEPERSON.
Electrical Strength Tests
Components within the power supply responsible for providing the safety barrier between input and output
are constructed to provide electrical isolation as required by the relevant standard. However EMI filtering
components could be damaged as result of excessively long high voltage tests between input, output and
ground. Please contact our technicians for advice regarding electric strength tests.
Earth Leakage
The EMI suppression circuits causes earth leakage currents which may be to the maximum allowable of
3.5mA.
Ventilation
High operating temperature is a major cause of power supply failures, for example it has been well docu-
o
mented that a 10
C rise in the operating temperature of a component will halve its expected life. Therefore
always ensure that there is adequate ventilation for the equipment. Batteries and cooling fans also suffer
shortened lifetimes if subjected to high ambient temperatures - both should be included in a routine mainte-
nance schedule to check for signs of reduced efficiency.
Water / Dust
Every effort must be made in the installation to minimise the risk of ingress of water or dust. Water will almost
always cause instant failure; the effects of dust are slower in causing failure of electronic equipment. All
electrical equipment should be cleaned free of any dust accumulation at regular intervals.
Electromagnetic Interference (EMI)
Switching power supplies and converters inherently generate electrical noise. Power supply wiring should be
as short as practicable and segregated from all equipment wiring which is sensitive to EMI. Residual noise
can be reduced by looping DC wiring through ferrite cable sleeves. These are most effective as close to the
power supply as possible and as many turns of the wire taken through the core (+ and - in the same direction)
as the core will accommodate.
Fuses
The charger is fitted with AC and DC fuses but external fuses may be used by the installer for added protec-
tion.
Specifications are subject to change without notice.
No liability accepted for errors or omissions.
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