Water-cooled frequency inverters
Compact design due to water cooling
Liquid-cooled frequency inverters do not require additional room air conditioning. With very compact cabinets, they enable space-saving solutions in confined environments. 98 percent of the heat generated is dissipated directly by the liquid. This enables very high drive efficiency, while the integrated redundancy prevents unwanted downtimes thanks to modules connected in parallel.
The series of liquid-cooled ACS880 frequency inverters from ABB covers a power range from 250 to 6,000 kW. The compact drive consists of diode feed units and inverter units with modules connected in parallel, which enable a large power range with a very small footprint. Thanks to the modular design and the extended software features of the frequency inverter, even unusual drive solutions can be implemented. A large number of integrated features and options are available. The fact that no room air conditioning is required simplifies installation and operation at the same time. The liquid-cooled ACS880-07CLC can be used to precisely control asynchronous, permanent magnet, AC servo and synchronous reluctance motors. Thanks to their installation in fully enclosed control cabinets, the frequency inverters are particularly suitable for use in harsh environmental conditions, such as in shipbuilding and offshore applications.
The frequency inverter is completely installed in a switch cabinet without a cooling opening and therefore meets protection class IP42 as standard or IP54 as an option. As a result, salty air cannot circulate in the frequency inverter and lead to malfunctions or a shortened service life.
The high power density of the devices results in a very compact design. Some of the frequency inverter cabinets are only half as wide as the air-cooled versions with the same output. When used in ships, the liquid cooling is installed centrally for all or several systems. In addition, the frequency inverters are connected and disconnected externally. This makes the ACS880-07CLC frequency inverter cabinet considerably smaller. Thanks to their compact design, the devices offer particular advantages in installation locations with limited space, such as containers or confined electrical rooms.
Effective direct liquid cooling
The ACS880-07CLC works with direct liquid cooling. In addition to high efficiency, it enables simple heat dissipation without air filtration and reduces the need for high-performance air cooling with filtration in the installation rooms.
The cooling dissipates 98 percent of the heat loss through the liquid and only 2 percent is radiated into the environment. The type of coolant used is Antifrogen L from Clariant International, a container with an optimum mixing ratio. It is a ready-to-use, commercially available mixture that enables simple commissioning.
The heat losses from the control cabinets are therefore almost completely dissipated with the coolant. Additional air conditioning of the drive via an air conditioning system is therefore not necessary, which significantly shortens the amortization times for the devices.
The elimination of expensive and complex filter systems, such as those required in conventional, air-cooled frequency inverters under harsh operating conditions, further increases the cost-effectiveness of the devices. As no dirt-laden or salty air needs to be drawn in, the units are also significantly less sensitive than air-cooled devices. The lack of additional air conditioning units or air ducts also simplifies installation considerably and reduces operating costs. The direct liquid cooling also enables low-noise operation. The ACS880-07CLC is therefore also suitable for applications where the noise level is an important environmental factor.
Operational reliability through redundancy
The frequency inverter also offers integrated redundancy, which is achieved by connecting the modules in parallel. Each module is a complete three-phase inverter. If one of the modules fails or is being serviced, the motor can continue to run at partial load with the remaining modules. This results in higher drive availability and longer operating times. The devices are available as a 6, 12 or 24-pulse solution. The 12-pulse solution offers the additional advantage of extremely good harmonic behavior, as it suppresses the fifth and seventh order harmonics. This results in a very low harmonic content of the mains current.
Bernd Thürauf, Product Manager Enclosure Devices and Module Packages, ABB Automation Products
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