HEIDENHAIN TNC 335 Technical Manual - Manual (Page 41)

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TNC 360 2 Assembly Hints 3-11
2.5.2 Visual display unit (VDU)
Permissible ambient temperature
BE 212 max. 45° C (113° F)
BF 110 max. 40° C (104° F)
The VDU must be installed with a minimum clearance of 25 mm to the housing. It is recommended
especially, that a large area is left free above the unit for heat removal.
Temperature is measured at a distance of 25 mm to the housing. The above mentioned
temperatures must not be exceeded.
Please also note for the BE 212:
When mounting the VDU it must be remembered that this unit is very sensitive to magnetic pick-up.
The picture position and geometry can be disturbed by stray magnetic fields. Alternating fields cause
periodic movement or distortion of the picture.
For this reason, keep a minimum distance of 0.5 m between the VDU casing and the source of any
disturbance (e.g. permanent magnets, motors, transformers etc.)
2.5.3 PLC Input/Output board PL 410
One PL 410 can be connected to the LE 360 C, if desired. There is no preferred mounting position
for heat removal.
2.6 Degree of protection
When mounted, the visual display unit and the keyboard unit provide class IP54 protection against
dust and splashwater.