Main electrical lines and motor connections
This section describes the functions, specifications, and procedures required to safely connect the Clean Power VFD to the electrical mains and to the motor.
When you install power and signal cables in the terminal blocks, only use cables that meet the required specification for the safe and reliable operation of the product.
Refer to the following information to assist you with cable selection.
Configuration of power terminal Block⚓
Marking | Name | Function |
|---|---|---|
R / L1 | Main line terminals | Connect the main supply to the Clean Power VFD power input. |
S / L2 | ||
T / L3 | ||
| Grounding | Connect to earth (Impedance of the connection must conform with local regulations) |
U / T1 | Power output terminals | Connect the motor to the Clean Power VFD power output. |
V / T2 | ||
W / T3 |
Wiring specifications⚓
Clean Power VFD model | Terminals | Screws | Tightening torque | Conductor stripping length | Solid conductor cross section | |||
|---|---|---|---|---|---|---|---|---|
Type and size | N.m | in-lbs | mm | in | mm2 | AWG | ||
SDB 1 2 185 | Ground | M5, Combo head .25/6.25 Blade , #2 pozidrive | 2.71 | 24 | 12 | .5 | 10 | 8 |
R S T L1 L2 L3 | M5, Combo head .25/6.25 Blade , #2 pozidrive | 2.71 | 24 | 12 | .5 | 10 | 8 | |
U V W T1 T2 T3 | M5, Combo head .25/6.25 Blade , #2 pozidrive | 2.71 | 24 | 12 | .5 | 10 | 8 | |
Motor cable length and voltage drop⚓
Maximum length for the cable between the motor and the Clean Power VFD is 300 m (1000 ft).
Ensure that voltage drop is correctly accounted for in wire size selection.
If the calculated voltage drop is >2% of the rated motor voltage, then increase the gauge of the wire.
Ensure that the selected gauge is compatible with the terminal blocks of the Clean Power VFD.
Voltage drop may be calculated using the following formula:
Line loss voltage (V) = √3 x wire resistance (Ω /m) x wire length (m) x current (A)
Grounding⚓
The Clean Power VFD must be connected to the earth ground of the AC supply.
Ensure that grounding wires meet the technical standards for electrical equipment. Impedance must conform with national and local regulations, safety regulation and/or electrical codes
Furthermore, ensure that the length of grounding wires are minimized.
The Clean Power VFD type SDB 1 2 185 has 2 earth (ground) terminals that must be securely connected to the earth ground before use.
The Clean Power VFD enclosure has been designed with materials that ensure electrical isolation. Despite this, there is the possibility that small leakage currents may still be present.
In order to mitigate the risks posed by these leakage currents, the Clean Power VFD must be connected to a low impedance earth ground.
Proper grounding eliminates the risk of electric shock due to leakage current when touching the Clean Power VFD case.
In addition to the mitigation of leakage current, a good low impedance ground is important for the correct functioning of EMI-sensitive equipment. It reduces the impact of electrical noise in the installed environment.