Recommended products

Converter applications

*FR-A842 VFD serving as a high power factor converter

FR-A842 converter connects to multiple VFDs

Up to 10 VFDs are connectable to a single FR-A842 converter. Ensure that the capacity of the converter is greater than the total capacity of connected VFDs or motors. (If both VFDs and motors are connected, choose the larger combined capacity of either the VFDs or motors.) Additionally, the total capacity of the VFDs or motors needs to be equal to or higher than half the capacity of the FR-A842 converter. (FR-A842 converter capacity × 1/2 total capacity of connected VFDs or motors FR-A842 converter capacity) If the total VFD capacity is less than half the FR-A842 converter capacity the harmonic suppression effect is reduced

• Junction terminals and cross wiring may be required for the wiring of the multiple VFDs. For the gauge of cable used between the two junction terminals, refer to the descriptions in the following figure. Total capacity of higher-number axis VFDs must be considered for the cable selection.
• For the multiple VFD connection, place the higher capacity VFD in the lower number axis.
• It is recommended that a fuse is wired to each VFD power cable used between the VFD and the junction terminal. Select a fuse according to the motor capacity. When using a motor, of which the capacity is smaller than the VFD capacity by two ranks or more, select the fuse with the capacity that is one rank lower than the VFD capacity.
• Keep the length of cables between the converter and the final axis VFD on each terminal within 50 m.