Connecting The Vfd To The Power Supply - Grundfos DMX 221 Instrucciones De Instalación Y Funcionamiento

11.2.2 Connecting the VFD to the power supply

The VFD is connected to the pump on delivery, so you only need to connect the power supply.
As soon as the power supply is connected to the VFD and switched on, the pump can automati-
cally start operating depending on the potentiometer setting. Make sure the power supply to the
VFD is only switched on when the pump is ready for startup and operation.
There is no need to take special safety measures on the mains input side of the frequency con-
verter. We advise you to use ordinary mains fuses and a main switch or a circuit breaker.
Isolate the connector from the power supply simultaneously for all the poles (L1/L2/L2 or L1/N).
Requirements for the power cable cross section:
•
0.2 - 4/6 mm
• To loop the mains voltage up to a cable cross section of 2 x 2.5 mm², use double-wire end
sleeves.
Fig. 11.2.2-1 Electrical connection of the VFD
Pos.
1
2
1. Switch off the power supply.
2. Unscrew the screws of the front cover of the VFD power unit and remove the front cover.
3. Lead the power supply cable through a cable gland.
4. Strip the cable sheath to a length of approx. 3-5 cm and the wires to a length of 7 mm.
5. Connect the wires to the power supply terminals according to the wiring diagrams printed in
the VFD.
CAUTION
Automatic startup
Minor or moderate personal injury
● Make sure the pump has been correctly installed and is ready to be started
before you switch on the power supply.
Read the supplier manual "BU 0180" for the VFD supplied with the product.
2
rigid / flexible cable AWG 24-10
1
2
Description
VFD mains connection
VFD terminals
L3 L2/N L1 PE
DMX 221 | | 57