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The drives considered for load sharing must be of the same product series.
The drives must all have the same voltage rating, for example, use T5 with T5 only.
Place the drives physically close to each other to allow the wiring between to be as short as possible (maximum 25 m (82 ft)).
Build the wiring symmetrically around the drives with the highest power. Moreover, run the 2 wires closely together and, if pos-
sible, twisted.
When adding a brake resistor in a load sharing configuration, equip all drives with a brake chopper.
A brake chopper is specified in the type code when ordering and cannot be retrofitted. The standard selection in character 18 of
the type code is B. For enclosure size A1, selection U, brake c STO, is also a possibility.
The fan in enclosure sizes D, E, and F must be supplied from an external power supply.
N O T I C E
Continuously monitor the
Drive ready
signal of the drives. The
Drive ready
signal impacts the overall application control.
N O T I C E
MISSING PHASE AND OVERCURRENT PROTECTION REQURIED
Drives can have their rectifier overloaded even though the DC link does not show a high level of voltage ripple. Therefore, the
mains supply must be equipped with missing phase and overcurrent protection.
N O T I C E
UNINTEDED WARNINGS OR REDUCED PERFORMANCE
In a load sharing application, the AC-brake function does not work as expected. The function checks for regenerative power, but
in a load sharing application, the regenerative power can come from another drive.
Turn off the AC-brake function in load sharing applications (
parameter 2-10 Brake Function
). Example: A drive without a brake
is combined with a drive with brake. When the drive with a brake is braked, the other drive receives an overcurrent warning.
Performance is not affected.
N O T I C E
The start-up time of the drive may be slightly longer than normal.
N O T I C E
According to the EMC Directive, a system is defined as a combination of several types of equipment, finished products, and/or
components combined, designed and/or put together by the same person (system manufacturer) intended to be placed on the
market for distribution as a single functional unit for an end user and intended to be installed and operated together to perform a
specific task. The EMC directive applies to products/systems and installations, but in case the installation is built up of CE marked
products/systems the installation can also be considered compliant with the EMC directive. Installations shall not be CE marked.
According to the EMC Directive, Danfoss Drives as a manufacturer of product/systems is responsible for obtaining the essential
requirements of the EMC directive and attaching the CE mark. For systems involving load sharing and other DC terminals, Danfoss
Drives can only ensure compliance to EMC Directive when end users connect combinations of Danfoss Drives products as descri-
bed in our technical documentation.
If any third-party products are connected to the load share or other DC terminals on the AC drives, Danfoss Drives cannot guaran-
tee that the EMC requirements are fulfilled.
6.4.2 Combinations of Enclosure Sizes
The concept for limiting inrush current in the DC-link capacitors is not the same for all enclosure sizes. Therefore, options for com-
bining different enclosure sizes in load sharing applications are limited.
AJ300847815559en-000101 / 130R0337
54 | Danfoss A/S © 2020.09
Product Features
VLT® AQUA Drive FC 202
Design Guide