01/02 AWB8230-1413GB
Analog outputs – AM, AMI and
FM
59
PWM signal
The output signal is a square wave with a constant period of
oscillation. Its pulse width is proportional to the current frequency
value (0 to 10 V correspond to 0 Hz to the end frequency).
If, for example, a higher level of smoothing of the PWM signal is
required for a motor current display, an external low-pass filter
circuit is required.
FM signal
The frequency of this signal (PNU C027 = 00) changes
proportionally to the output frequency. The pulse duty factor
remains constant at about 50 %. The output frequency at the FM
terminal is ten times that of the DF6 frequency inverter’s maximum
output frequency, i.e. up to 4 kHz. This signal does not have to be
matched; its accuracy is monitored digitally.
Analog measuring
instrument
0 to 10 V
1mA
t/T = variable
T = 4 ms (constant)
Figure 46: Connection of analog measuring instrument
Figure 47: Example of a low-pass circuit
0 – 10 V
1 mA
FML
–
+
10 V
t
T
33 kO
82 kO
1 mF
+
–
+
FML
0 – 10 V
1 mA
Digital frequency meter T = 1/(output frequency x factor)
Figure 48: Digital frequency meter connection
FML
f
–
+
10 V
T
efesotomasyon.com - Klockner Moeller - inverter
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