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VFD68 Variable Frequency Drives
48
Frequency and Motor Speed
Frequency (Hz) is an expression of motor speed (RPM) on the VFD. Figure 31 and Figure 32 show how the
drive's operating frequency is related to the speed (RPM) of the motor.
The VFD68Bxx and VFD68Cxx drive models can be configured to display operating frequency (Hz) or motor
speed (RPM). To display motor speed (RPM) instead of operating frequency (Hz):
1.
Set P.160 to 0.
2.
Set P. 37 to the rated motor RPM value.
3.
Set P.160 to 9999 (on the VFD68Bxx and VFD68Cxx models only).
See
Adjusting the Default Parameters
P.905
(screen a)
Analog Input 2:
Maximum speed defined as frequency.
1–400 Hz
60 Hz
P.905
(screen b)
Analog Input 2:
% of input current for setpoint (where motor
reaches maximum frequency or speed).
1–100%
54.8% (11 mA)
1.
If P. 32 = 9999, then the speed of the motor controlled by the VFD68 will not drop below P. 2 (minimum motor speed),
regardless of the mode selected.
2.
If the VFD68 supply voltage is greater than the motor rating voltage (such as when using a 208 VAC motor with a
230 VAC supply), enter the motor rating voltage for P. 19. This allows the motor to run cooler.
3.
A setting value of 0 indicates 0.7 kHz. A setting value of 1 indicates 1 kHz. A setting value of 15 indicates 15 kHz.
Table 35: Parameter Descriptions for VFD68Dxx Drives (Part 3 of 3)
Parameter
Indication
on Monitor
Description
Settings
Default
Setting
Figure 31: Frequency and Motor Speed (60 Hz)