Lenze EMB9352−C - Manual (Page 92)

Mechanical installation
Mounting in cold−plate design
Fields of application
6
l
92 EDBMB935X DE/EN/FR 13.0
6.4 Mounting in cold−plate design
6.4.1 Fields of application
This variant is especially used in the following applications.
ƒ Use of cooling units without blower:
– Heavy pollution of the cooling air, for instance, impedes the operation
of blowers, as it would affect both the function and the service life of
the fans.
ƒ High degree of protection in the case of thermal separation:
– If thermal separation has to be used due to the power balance within
the control cabinet, and if the enclosure of the cooling unit has to be
greater than IP41.
ƒ Use of the controllers directly within the machine with a reduced overall
depth:
– Constructional elements of the machine take over the cooler function
ƒ Collective coolers (water coolers, forced−air coolers, etc.) for all controllers
are provided for in the system concept.
6.4.2 Requirements with regard to the cooler
The dissipation of the power loss by the braking unit can be effected via coolers
operating with different cooling media (air, water, oil, etc.).
In addition to the characteristics specified by the user, the following is
important for a safe operation:
ƒ Good thermal connection to the cooler
– The contact surface between the external cooler and the cooling plate
of the braking unit at least has to be as large as the cooling plate.
– Surface planarity of the contact surface approx. 0.05 mm.
– Connect cooler and cooling plate with all screwed connections
specified.
ƒ Observe thermal resistance R
th
(transition of cooler − cooling medium)
according to table. The values apply to
– The operation of the braking unit under rated operating conditions (see
chapter 4.2)
– A maximum temperature of the cooling plate of 75
_C, measuring
point: narrow side of the cooling plate level with a point half way up
the controller.