| 摘要 |
The mains- or battery-fed LV unit (1) provides an adjustable stabilised supply (2) to a converter (3) whose filtered (11) variable frequency output passes by a flexible connection (4) to a step-up transformer (6) in the HV applicator (5), supplying the projection electrode (8) via a voltage multiplier (7). The operator adjusts voltage and frequency to suit the coating and the object coated. Representative HV voltage and current signals(UHT,IHT) are input, with corresponding LV signals(Ualim,Ialim), to a calculating unit (10), which compares them with memorised reference values (12). A discrepancy exceeding, say, 20% is taken to signify a fault condition; the LV supply is interrupted (13) and an alarm (14) given. A delay, e.g. 1 sec., prevents unnecessary interruptions for start-up and transient abnormalities. |
