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Proceed as follows to replace the mains fuse:
• Turn off the power supply and disconnect all connection cables from the device
and the power plug from the power socket.
• Now press the rear of the fuse holder in somewhat with a suitable straight-edge
screwdriver and turn it anticlockwise outward one quarter of a turn (bayonet
catch).
• Replace the defective fuse with a new fine-wire fuse (5 x 20 mm) of the same type
and rated current:
T 2.5 A / 250 V (slow burning).
• Rotate the fuse insert clockwise while pressing it back into the fuse holder.
Troubleshooting
By purchasing the power supply you have acquired a product that is reliable and
operationally safe.
However, problems and malfunctions may occur.
For this reason we want to describe how to troubleshoot potential malfunctions:
Do not fail to heed the safety instructions!
Fault
Possible cause
The power supply unit does
Do characters appear in the display?
not work
Check the mains voltage (you may also want to
check the mains fuse in the device or the line
circuit breaker).
Connected consumers do
Has the correct voltage been set?
not work
Is the polarity correct ?
Is the power supply unit overloaded ?
Check the technical data of the consumers.
Is the current limitation active ?
Periodically check the technical safety of the device, e.g. check for damage to the
housing etc.
Any other repair work must always be carried out by qualified
experts familiar with the hazards involved and with the relevant
regulations. Unauthorised modifications and repairs of or inside
the device will render the warranty null and void.
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• Electric appliances and accessories should be kept out of the reach of children!
• On commercial premises, the relevant accident prevention regulations for electri-
cal equipment must be complied with.
• In schools and training centres as well as at hobby and DIY workshops, the use of
power supplies must be supervised by adequately trained personnel in a responsi-
ble manner.
• Please make sure by all means that your hands, your shoes, your clothing, the floor
and the power supply are dry.
• Potentially lethal voltages (> 35 VDC) are generated when the outputs of one or
more power supplies are switched in series.
• Before opening it, disconnect the device from all voltage sources.
• Capacitors in the device may still be charged, even if the device has been discon-
nected from all voltage sources.
• Do not switch the power supply on immediately after it has been taken from a cold
to a warm environment. Under adverse conditions, the resulting condensation
could destroy the device. Allow the device to reach room temperature before
switching on.
• The power supply generates heat during operation. Make sure it is adequately ven-
tilated. Do not cover the ventilation apertures of the device!
• Do not leave mains power supplies and the connected consumers in operation
unattended.
• Use only fuses of the type and rated current specified. It is absolutely impermissi-
ble to use repaired fuses.
• Avoid the use of uninsulated metallic cables.
• Power supply units are not designed for use on human beings or animals.
• If you have reasons to assume that safe operation is no longer possible, immedi-
ately take the device out of operation and secure it against inadvertent operation.
Reasons to assume that safe operation is no longer possible include:
- the device shows signs of visible damage
- the device no longer functions and
- has been stored for long periods under unfavourable conditions or
- has been subjected to considerable stress in transit.
• You should also heed the additional safety instructions in each chapter of these
operating instructions as well as in the operating instructions of the connected
devices.
Functional description
The power supply unit PS 405 Pro has two independent extra-low voltage outputs
with controllable output voltages.
The DC outputs of the power pack are dc-isolated and feature a fuse disconnector to
the mains voltage.
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