Free Running Impellers

Properties

The Rosenberg centrifugal fans with free running, backward-curved, high-performance impellers in the GKHM / GKHS / GKHR series form a very compact, constructively optimal ventilator unit in conjunction with an electronically commutated external rotor motor (EC motor) with newly developed integrated power electronics.

In developing these centrifugal fans, compact power electronics was adapted to the proven Rosenberg EC external rotor motor (GD 150). This drive concept results in a very compact unit in which the EC controller and the EC motor no longer have to be physically installed separately from each other.

Free running impellers with EC motors are available depending on the size of different designs:

GKHM

fan built-in module

GKHS

fan built-in module with spider design

GKHR

motor impeller with or without loose enclosed inlet cone

Electrical connection

The mains connection and the contacting of all control and signal inputs are carried out directly on the motor. This eliminates the time-consuming connection with shielded cables.

Speed control

The infinitely variable speed input of the motor is done by connecting an external potentiometer (accessory) or an external 0-10 V/PWM signal.

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Properties

The Rosenberg centrifugal fans with free running, backward-curved, high-performance impellers in the GKHB series form a very compact, constructively optimal ventilator unit in conjunction with an electronically commutated external rotor motor (EC motor) with newly developed integrated power electronics.

Electrical connection

The fans are delivered ready for installation and are equipped with an easily accessible motor terminal box. The electrical installation must be done in accordance with the valid provisions and observing the local regulations. A wiring diagram is included each engine, from which the correct connection of the motor can be seen. The motor connection is only carried out with shielded cable and may not exceed a total length of 10 m. The operating instructions of the electronic commutating unit must be observed.

Speed control

The infinitely variable speed input of the motor is done by connecting an external potentiometer (accessory) or an external 0-10 V / PWM signal.

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Properties

The fans are designed mainly for device installation and are preferably used in air-conditioners, hygiene equipment, clean room filter units and HVAC systems. During the development of the backward-curved impeller for use without a spiral casing, special emphasis was placed on optimising efficiency over a wide characteristic curve with high power density, whilst having as optimal a noise level as possible. The fans are designed to convey air and other non-aggressive gases or vapours. As drive motors, asynchronous external rotor motors from our own production are used. In addition to the modular design (DKHM), these fans are also available as a motorised impeller (DKHR).

Impellers

The impellers with 8 backward-curved blades are made of aluminium sheet (AIMg3) and statically and dynamically balanced together with the impeller hub or the external rotor motor used according to the quality level G 2,5 / G 6,3 as per DIN ISO 21940-11. If desired, the wheels can also be manufactured from sheet steel with a plastic coating. The direction of rotation of the impellers is standard clockwise rotation (seen from the suction side). Counter-clockwise operation will cause overload damage to the motor. Therefore, the direction of rotation should always be checked before starting up.

Electrical connection

Electrical connection via external terminal box protection class IP44.

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Properties

Fan module with motor mount and base frame. Screwed into the inlet cone and adjusted to optimum immersion depth. Entire unit can be installed decoupled through vibration or spring damper elements. Drive motor in type IMB3, IMB5 version available on request. Standard version for installation with a horizontal motor shaft; with additional mounting rail, module can also be used hanging with vertical motor shaft. Fan module without base frame. Screwed into the inlet cone and adjusted to optimum immersion depth. Drive motor in type IMB5.

Motors

IEC standard three-phase motors in IMB3 or IMB5 design. Protection class IP55, 400V/50Hz, thermal class F. The motors are suitable for operation with a frequency converter. The detailed information provided by the motor manufacturer for commissioning and maintenance, especially with regard to site provided motor protection devices, must be observed.

Motor protection

All motors have PTC thermistors inserted in the winding (motors with thermal contacts upon request), which automatically monitor the winding temperature of the motor. If wired correctly, they protect the motor from overload, failure of a mains phase, brake locking of the motor, and from air temperatures which are too high. The motor protection devices offered by us include the motor protection device in combination with PTC thermistors in the MSD1 K model. In general, the PTC thermistor can be connected directly to the frequency converter used.

Electrical connection

The drive motors are fitted with an outgoing cable. The electrical connection is made via a protection class IP44 terminal box which is supplied loose.

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