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Protection
Overvoltage protection (OVP) is fully variable within the range 10% to 110% of the supply's
maximum output level. The OVP limit is set via the screwdriver adjustable SET OVP preset
potentiometer, accessible through a hole in the front panel. Rotating the preset clockwise
increases the limit, which can be read directly on the left-hand display by pressing the READ
OVP button. If the voltage on the output exceeds the set OVP for any reason, including an
externally forced voltage, the output will be tripped off.
The output will also be tripped off if the thermal sensing detects overheating of any of the power
semiconductors, or if the sense wires are wired to the wrong output or if an attempt is made to
draw power from the sense wires.
In all the above cases, the 'TRIP' message will be shown in both displays. Once the cause of the
trip has been removed, normal operation can be restored by switching the POWER switch off ( )
l
then on (
) again.
The output is protected from reverse voltages by a diode; the continuous reverse current must not
exceed 3 Amps, although transients can be much higher.
Ventilation
These instruments are very efficient but nevertheless can generate significant heat at full power.
The supplies rely on convection cooling only and it is therefore important that ventilation is never
restricted if performance and safety are to be maintained. If the supplies are mounted in a
restricted space, eg. a 19 inch rack, then adequate ventilation must be ensured by using, for
example, a fan tray.
The Manufacturers or their agents overseas will provide repair for any unit developing a fault.
Where owners wish to undertake their own maintenance work, this should only be done by skilled
personnel in conjunction with the service manual which may be purchased directly from the
Manufacturers or their agents overseas.
Fuse
The correct fuse type for all models and AC supply ranges is:
Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse-holders is prohibited.
To replace the fuse, first disconnect the instrument from the AC supply. Remove the 6 cover
securing screws and lift off the cover. Replace the fuse with one of the correct type and refit the
cover.
Note that the main function of the fuse is to make the instrument safe and limit damage in the
event of failure of one of the switching devices. If a fuse fails it is therefore very likely that the
replacement will also blow, because the supply has developed a fault; in such circumstances the
instrument will need to be returned to the manufacturer for service.
Cleaning
If the PSU requires cleaning use a cloth that is only lightly dampened with water or a mild
detergent. Polish the display window with a soft dry cloth.
WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE PSU, NEVER ALLOW
WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR DISPLAY
WINDOW NEVER CLEAN WITH SOLVENTS.
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Telemeter Electronic GmbH | Joseph-Gaensler-Str. 10 | Phone +49 906 70693-0 | Fax +49 906 70693-50 | www.telemeter.info
Maintenance and Repair
10 Amp 250V HBC time-lag, 5 x 20 mm
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