Long Motor Cables: Effects Of Volt Drop And Capacitance - IMO iDrive EDX 100V series 1-ph/0.2 – 0.75kW (0.25 – 1HP) Owner's Manual

(a) Correct
To ensure maximum safety, use correct wire size for the main power circuit and control circuit
according to the required wiring regulations.
On completion, check that the wiring is correct and terminal screws are secured.

3.3.5 Long motor cables: effects of volt drop and capacitance

When the cable between the iDrive and the motor is too long, the effect of volt drop along the cable
and cable capacitance must be considered. For very long cables it is sometimes necessary to use
iDrive one frame size higher than motor power rating.
Phase-to-phase voltage drop (V
V
= 3 × resistance of wire (Ω/km) × length of line (mts) × current × 10
d
To prevent RF problems and excessive high frequency ground leakage currents the iDrive carrier
frequency (function b86) should be adjusted based on the length of the motor cable, for example:
Motor cable length
Carrier frequency (b86)
3.3.6 Input side AC reactor
An AC input reactor can be installed to reduce the harmonic content of the iDrive input current. If
the harmonic distortion is reduced, the RMS input current is also reduced.
An AC reactor can also be installed on the output side of iDrive when the motor cable is excessively
long and can counter the effect of cable capacitance and nuisance tripping. Contact IMO for details.
Input reactor specifications
iDrive
EDX -
Chapter 3 Environment description and installation
(b) Incorrect
)
d
< 25m
< 16kHz
model
040-21-#
075-21-#
150-21-#
220-21-#
075-43-#
150-43-#
220-43-#
3-13
(c) Incorrect
< 50m < 100m
< 12kHz < 8kHz
Line input side AC inductance (typical)
Current (A)
5.0
5.0
19.0
25.0
2.5
5.0
7.5
-3
> 100m
< 5kHz
Inductance (mH)
2.1
2.1
1.1
0.71
8.4
4.2
3.6