Operating Manual - SCHNIER Elektrostatik GmbH
Operating Manual - SCHNIER Elektrostatik GmbH
Operating Manual - SCHNIER Elektrostatik GmbH
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7. Functional Description<br />
7.1. General<br />
The high voltage generator is built as a compact design. The control, power amplifier,<br />
the transformer and the HV multiplier are combined in one device. Supply Voltage is<br />
24 V DC. The built-in microcontroller provides a very accurate and fast control of the<br />
HV output.<br />
7.2. Safety<br />
The voltage (U) at the HV connector is measured permanently even after switching off<br />
the high voltage. With a given capacity (C) one can calculate the discharging energy<br />
(E) that remains in the spraying system and the high voltage supply system:<br />
E=1/2C* U 2<br />
E: remaining discharging energy after switch off in Joule<br />
C: total capacity of the whole HV supply system in Farad<br />
U: Voltage level in Volt<br />
Factory preset for the calculation by the HV generator is 3nF. This value can be<br />
changed via CAN bus to the actual capacity of the installation (not yet implemented).<br />
Based on the limit of 0.24mJ (EN 50176,50177,50223) for the discharge energy to be<br />
safe the hv generator sets the bit “high voltage is off safely” in the status word if E is<br />
below this limit. Otherwise the bit is reset. For 3nF and 0.24mJ the voltage limit is about<br />
400V.<br />
WARNING<br />
If a Generator has to be removed for repair –<br />
especially after the occurence of failures of selftests –<br />
Observe Section 6 of this manual.<br />
<strong>Operating</strong> Instructions 810364_BAL_EN120302 Stand 02.03.2012 Seite 14 von 25
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