VFD68 Variable Frequency Drive (575 VAC) Installation Instructions
14
Note:
If the maximum wire length needs to be extended, select a larger wire size and recalculate the maximum
wire length.
Do not exceed 100 m.
Note:
Maximum wiring length is also affected by the setting of P. 72. See
PWM Frequency, Audible Motor Noise,
Example:
Given a VFD68DGM-2C model, what is the maximum wiring length?
a.
Table 1 on page 4 indicates that a VFD68DGM-2C model is a 575 VAC Drive, rated for 1.49 kW (2 HP).
b.
The rating information plate (Figure 1 on page 4) for that model indicates that the VFD68DGM Drive has a
voltage rating of 575 VAC and a maximum output rating of 7 amperes.
c.
Table 9 on page 13 gives the recommended wire size as 14 AWG.
d.
Table 10 on page 13 shows 14 AWG size wire as having an electrical resistance of 8.28 milliohms/meter.
e.
Using the equation in Figure 7 on page 13 and using the values we found in the steps above:
(11.5 * 230) / (7 * 8.28) = 2656.6 / 57.96 = 45.8
The maximum wire length is 45.8 meters.
Making High-Voltage Wiring Connections
1.
Push down on the hooks at Position A and Position B and pull it away from the VFD68 Drive, using the hooks
at Position C as supporting points (Figure 8).
Figure 8: Release the Hooks and Remove the Front Cover
