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Installation
3 Installation
3.1 Mechanical Installation
The brake resistors are cooled by natural convection, and
the specified minimum clearances must be observed to
ensure efficient ventilation. The ventilation must be
efficient enough to dispatch the regenerative power in the
brake resistor.
NOTICE
When installing the brake resistor, ensure all precautions
are in place to avoid the risk of overloading. Overloading
can lead to a fire hazard due to the heat generated in
the brake resistor.
The brake resistor is very hot during or after braking.
The brake resistor must be located in a secure
environment to avoid fire risk.
•
Mount the brake resistor free of any combustible
materials at a well ventilated location.
•
The MCE 101 brake resistors product type 9xx
contain a built-in temperature switch (for
overtemperature protection purposes. See
chapter 3.3 Protective Functions).
3.1.1 Aluminium-housed Compact Brake
Resistors and Flat-pack Brake
Resistors
The aluminium-housed compact and flat-pack brake
resistors are designed for vertical mounting for optimum
cooling performance. However, horizontal mounting is
possible for both flat-pack and compact brake resistors.
Derating with 20% is required when mounting the
compact brake resistors horizontally. No derating for flat-
packs are required. The enclosure protection of the IP21
types is reduced to IP20 when mounted horizontally.
NOTICE
All resistors are cooled by natural convection. To ensure
sufficient airflow and cooling, follow minimum clearance
in Illustration 3.1 to Illustration 3.8.
MG90O202
Design Guide
Vertical Mounting, IP54
For minimum clearances for vertical mounting for all
aluminium-housed compact and flat-pack brake resistors,
see Illustration 3.1 and Illustration 3.2.
Illustration 3.1 Vertical Mounting, IP54
Versions with Fixed Cables
Danfoss A/S © Rev. 05/2014 All rights reserved.
200 mm
3
3
7
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