Hardware and Engineering DF6-340-... Frequency ... - Moeller.com.tr

01/02 AWB8230-1413GB Analog outputs – AM, AMI <strong>and</strong>FMPWM signalThe output signal is a square wave with a constant period ofoscillation. Its pulse width is proportional to the current frequencyvalue (0 to 10 V correspond to 0 Hz to the end frequency).0 – 10 V1 mAL–+Analog measuringinstrument0 to 10 V1mAFMtTt/T = variableT = 4 ms (constant)10 VFM signalThe frequency of this signal (PNU C027 = 00) changesproportionally to the output frequency. The pulse duty factorremains constant at about 50 %. The output frequency at the FMterminal is ten times that of the <strong>DF6</strong> frequency inverter’s maximumoutput frequency, i.e. up to 4 kHz. This signal does not have to bematched; its accuracy is monitored digitally.L–f+FMDigital frequency meterTT = 1/(output frequency x factor)10 VFigure 46:Connection of analog measuring instrumentFigure 48:Digital frequency meter connectionIf, for example, a higher level of smoothing of the PWM signal isrequired for a motor current display, an external low-pass filtercircuit is required.LFM33 kO82 kO0 – 10 V1 mA–++1 mFFigure 47:Example of a low-pass circuit59