Frequency Inverter DF51... - Moeller.com.tr

04/07 AWB8230-1541GB System settingsPulse frequency (PNU b083)The pulse frequency is the operating frequency of the inverter’stransistors. It provides pulse-width modulated conversion of DClink voltage in three-phase, sinusoidal AC voltage for the threephasemotor.You can set the pulse frequency in the range from 2 to 14 kHz.High clock frequencies result in low operating noise and motorlosses but higher losses in the inverter and increased interferenceon the mains and motor cables (EMC). At an ambient temperatureof 40 o C and a clock frequency of 12 kHz the rated current I eshould be limited to 80 % and at 14 kHz to 70 %. If you operatethe frequency inverter outside its operating range, itslifespan maybe reduced.hI e[%]All ratings of frequency inverter DF51 are based on thedefault pulse frequency of 5 kHz.1008070ab5 12 14[kHz]hThe clock frequency should be increased (b083 > 5 kHz)only if the expected continuous current I e allows.Figure 151: Rating rangea Permissible operating rangeb Limit value at an ambient temperature of 40 °CPNU Designation RUN b031 =10Value Function DSb083 Carrier frequency – – 2…14 kHz Pulse frequency 5.0b150Clock frequency, automaticclock frequency reduction onovertemperature– j 00 Off: DisabledDF51 continually works with the pulse frequencyset with PNU b08301 On: EnabledOn overtemperature the pulse frequency isautomatically reduced to the smallest permissiblevalue (2 or 2.1 kHz).00137