5
(2000V
rms
+ 500V DC
<
4000 V
rms
).
- High energy may be stored in the output capacitors. Don’t cause a short circuit across the output.
- Don’t remove wires from the output terminals under load condition, especially at the higher voltage.
There probably will occur an arc, which may damage the unit. First turn off a load by disable
OUTPUT switch.
- The time between turning mains switch off and on must be min. 60s.
- The same type should replace fuses.
- Output voltage indicated on the display after turning disable OUTPUT switch off is present until
output capacitors discharge (depends on the load).
- To avoid overheating the output capacitors by a pulsating load, the AC component of the load
current should be limited. One method of decreasing the AC current on the output capacitor is by
using a large external electrolytic capacitor in parallel with load. This also reduces problems of the
inductance in a long lead. Care must be taken so that the capacitor in combination with the load
inductance will not form a serial resonant circuit.
- The output voltage is available 2s after mains switch on. This feature may be improved according to
customer requirements.
- Serial operation is allowed up to 300V total voltage. The power supplies can be connected in series
without special precautions.
- Parallel operation of the two units without active current sharing is allowed. It is recommended to
connect a diode per each unit – anode to plus terminal, cathode to common load and to set the same
voltage on both units at the turning disable OUTPUT switch off. When the both output voltages are
not the same nothing terrible happen because each unit has a current limitation. In parallel operation
may occur a higher ripple voltage which my be up to 2 times of the normal ripple voltage value. In
case of short circuit at any of the outputs of paralleling units, both units result short – circuited.
- Reverse polarity protection can be achieved with an external fuse combined with a rapid diode as in
following figure 3:
This case may occur especially in the battery charger application. After applying reverse polarity
SPS1000
+
-
+
incorrect polarity
of the battery
Fig.3
