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1.2.2 DC-bus Sharing: Connecting the DC-bus of the AC Motor Drives
in Parallel
1. This function is not for VFD-E-T series.
2. The AC motor drives can absorb mutual voltage that generated to DC bus when
deceleration.
3. Enhance brake function and stabilize the voltage of the DC bus.
4. The brake module can be added to enhance brake function after connecting in parallel.
5. Only the same power system and capacity can be connected in parallel.
6. It is recommended to connect 5 AC motor drives in parallel (no limit in horsepower but
these 5 drives should be the same power system and capacity).
U V W U V W U V W U V W
IM IM IM IM
Power 208/220/230/380/440/480 (depend on models)
power should be applied at the same time
(only the same power system and capacity can be connected in parallel)
Brake
module
For frame A, terminal + (-) is connected to the terminal + (-) of the brake module.
For frame B, C and D, terminal +/B1 (-) is connected to the terminal + (-) of the brake module.
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