VFD68 Variable Frequency Drives (230 or 460 VAC)
30
Frequency and Motor Speed
Frequency (Hz) is an expression of motor speed (RPM) on the VFD. Figure 18 and Figure 19 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.
See
Adjusting the Default Parameters
C 2
Analog Input 1 - Minimum speed defined as frequency.
0–400 Hz
12.5 Hz
C 3
Analog Input 1 - Input voltage to start minimum speed ramp
0–300%
1.90 V (38%)
C 4
Analog Input 1 - Input voltage for setpoint (where motor reaches
maximum frequency or speed)
0–300%
2.74 V (54.8%)
C 5
Analog Input 2 - Minimum speed (frequency)
0–400 Hz
12.5 Hz
C 6
Analog Input 2 - Input voltage or current
to start minimum speed
ramp
0–300%
1.90 V or
7.6 mA (38%)
C 7
Analog Input 2 - Input voltage or current for setpoint (where
motor reaches maximum frequency or speed)
0–300%
2.74 V or
11 mA (54.8%)
1.
A setting value of 0 indicates 0.7 kHz. A setting of 1 indicates 1 kHz. A setting value of 15 indicates 15 kHz.
Table 19: Basic and Advanced Parameter Descriptions for VFD68Bxx and VFD68Cxx Drives
(Part 4 of 4)
Parameter
Indication
on Monitor
Description
Range
VFD68xxx-2
Defaults
Figure 18: Frequency and Motor Speed (60 Hz)
