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DC Bus link (X3, X14)

The DC bus linkRectified and smoothed power voltage can be connected in parallel so that the regen power is divided between all the drives that are connected to the same DC bus link circuit. Every drive must have it's own power connection to mains voltage, even if the DC bus link is used. Drives working generatively very often should be placed beside drives, which need energy. That reduces current flow on longer distances.

The sum of the rated currents for all of the drives connected in parallel to an 003 to 024 must not exceed 48 A.
Use 6 mm², unshielded single cores with a max. length of 200 mm; use 6 mm² shielded cables for longer lengths. In this case no fuse for line protection is required.
The sum of the rated currents for all of the 048 connected in parallel to an 048 must not exceed 96 A. 048 should be connected in parallel only with 048 drives. Use 16 mm², unshielded single cores with a max. length of 30 mm; use 16 mm² shielded cables for longer lengths.

The drives can be destroyed, if DC bus link voltages are different. Only drives with mains supply from the same mains (identical mains supply voltage) may be connected by the DC bus link. DC bus link connection of 048 to other drives than 048 is not allowed.

The phase lost/ main control is not working on DC-Bus connected drives. A phase lost on a drive inside a DC Bus connection will be not detected. External phase monitoring to prevent overload of the rectifier is recommended.

00306 to 00606 (X3)
Pin	Signal	Description
2	-DC	DC-Link Bus negative
3	+DC (+RB)	DC-Link Bus positive

01206 (X3)
Pin	Signal	Description
3	-DC	DC-Link Bus negative
4	+DC (+RB)	DC-Link Bus positive

02406 & AKD00307 to AKD02407 (X3)
Pin	Signal	Description
3	-DC	DC-Link Bus negative
4	+DC (+RB)	DC-Link Bus positive

04807 (X14)
Pin	Signal	Description
1	-DC	DC-Link Bus negative
2	n.c.	not connected
3	+DC	DC-Link Bus positive

NOTE: Should be connected in parallel only with 048 drives.

DC Bus topology with Y connectors (24 A max.)

Without DC Bus fuses, other devices can become damaged or destroyed if, for example, a device fails due to an internal short circuit. If multiple drives are connected in parallel, then it is usual to insert DC Bus fuses () between groups of drives (with a group consisting of two or three devices, depending on the current) in order to limit any possible resulting damage. Fuses cannot avoid damage by current peaks completely.

DC Bus topology with busbar

This wiring does not require Y connectors. If a device fails due to a short-circuit, only its DC Bus fuses () are tripped and the rest of the network continues uninterrupted. The solid busbars can conduct significantly larger currents, because the compensating current does not flow through the connector as above. For this reason, almost as many drives as desired can be connected in parallel in this form. This arrangement is frequently also useful for connecting KCM capacitor modules.

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