Lenze EMB9352−C Manual do Utilizador descarregar pdf (Página 93)

Mechanical installation

Mounting in cold−plate design

Thermal behaviour of the complete system

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EDBMB935X DE/EN/FR 13.0

Braking unit

Cooling path

Power to be dissipated P

[W]

[K/W]

9351−V003 100 0.3

9352−V003 63 0.3

6.4.3 Thermal behaviour of the complete system

The thermal conditions within a system are affected by some basic conditions.

The following items have to be taken into consideration when a control cabinet

or system is designed:

Ambient temperature of the controllers

For the ambient temperature of the braking unit, furthermore the rated data

and the corresponding derating factors at increased temperature apply.

Heat generation in the interior of control cabinets

In addition to the device losses that are dissipated via the heatsink, further

losses have to be taken into consideration for the design:

ƒ Losses within the braking unit

– These losses are caused by the electronic supply, fans, DC−bus

capacitors, etc.

ƒ Losses of the components on the mains and motor side

ƒ Radiation of heat from the external cooling unit into the interior

– This portion of the heat energy for instance depends on the type of

cooling unit and the mounting mode.

Heat distribution on the collective cooler / within the control cabinet

If you mount several components (controllers, braking units, etc.) onto a

common cooler, it has to be ensured that the temperature on the cooling plate

of each individual component does not exceed 75 _C.

Measures:

ƒ Observe minimum clearances around the convection cooler.

ƒ Do not mount the components on top of each other.

ƒ In order to avoid heat concentrations within the control cabinet, use

internal fans, if required.

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Lenze EMB9352−C Manual do Utilizador Página 93