7 Additional settings
7.13 DC bus coupling
The coupling of DC buses is interesting for applications with high braking energy levels or
for applications requiring movements to be performed after a power failure. Some
important instructions must be followed for the coupling of Metronix devices. These
instructions are due to the circuit design of the inrush current limitation feature.
Inrush current limitation and precharging function
Servo drives have a DC bus. This DC bus buffers various power flows that result from the
power supply via the supply network with a fixed frequency and the positive or negative
power flow of the motor with a variable frequency.
Following the activation after the electric equivalent circuit, the capacitors of the DC bus
represent a short circuit. Very high short-circuit current during the activation of the power
supply is avoided by way of suitable measures. To this end, nearly all of the devices of the
BL4100-C series have an integrated precharging circuit.
Metronix servo drives are designed for different supply voltages (single-phase/three-
phase) and DC bus voltages. This is why all of the device variants cannot be coupled with
one another via the DC bus.
Even for devices with the same DC bus voltage, there are certain restrictions in terms of
the possible combinations. The type of supply must be known. In addition, the circuit-
related characteristics for the inrush current limitation must be taken into consideration.
Damage to property due to high electrical current
In the event of a short circuit or similar faults, high current may flow through the coupling.
A maximum of 4 BL4100-C servo drives can be coupled.
Please verify the technical data of the products and of the mains power supply. If in
doubt, contact the Technical Support team of your sales partner.
Damage to property due to different mains phases
If the DC buses of single-phase devices are coupled, the mains connectors must be
connected to the same mains phase.
If two servo drives of the BL4100-C series are to be coupled in the DC bus, only the
connector L1/N can be used for both of the devices.
It is strictly forbidden to connect the devices to different mains phases, e.g. servo drive
1 to L1/N and servo drive 2, to L2/N, when the DC buses are coupled!
Product manual BL 4000-C Page 186 of 298
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