Mecc Alte DER1, Техническое руководство

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DER1 digital regulator instruction manual - rev. 03 - pag. 26
6.2 V/F slope at start up
Parameter P[24]
sets the slope proper voltage / frequency at start up. After the underspeed alarm
frequency threshold has been exceeded (set by parameter P[21] or by the Hz trimmer), the work ramp is
used (parameter P[23]).
The default value is 6000; an increase in the value of P[24] will cause a greater reduction of low frequency
voltage; a decrease in the value of P[24] will cause a lower reduction in voltage, up to the limit of P[24]=0,
which means that no reduction in voltage will take place.
WARNING: If the voltage is not lowered enough with low frequency and the alternator is
operating in these points, overheating could develop that is dangerous for the machine.
6.3 Short circuit time
Parameter P[25]
defines the operating time with the alternator short circuited, which is expressed in
tenths of a second (from 0.1 seconds to 25.5 seconds); after this period of time the regulator goes to the
blocked status; a value of 0 disables the blockage.