HEIDENHAIN TNC 306 Technical Manual - Manual (Page 27)

3–12
TNC 416/TNC 406/TNC 306 Installation 3/99
2.5.2 Visual display unit
Permissible ambient temperature:
BC 120/BC 110/BE 212/BF 120: max. 45° C
BF 110: max. 40° C
The VDU must be installed with a minimum clearance of 25 mm to the housing. It is particularly
recommended that a large area is left free above the unit for heat escape.
Temperature is measured at a distance of 25 mm to the housing. The above mentioned
temperatures must not be exceeded.
When installing the BC 120/BC 110/BE 212, remember that this VDU is very sensitive
to magnetic interference. The image position and geometry can be disturbed by stray
magnetic fields; alternating fields can cause periodic movement or image distortion.
For this reason, keep a minimum distance of 0.5 m between the VDU housing and sources of
interference (permanent magnets, motors, transformers, etc.)
2.5.3 PLC Input/Output board PL 410 B
One PL 410 B can be connected to the LE 406 or LE 360 C, if desired. There is no preferred
mounting position for heat removal.
2.6 Degree of protection
Visual display unit when mounted Protection class IP54
Keyboard unit when mounted Protection class IP54
HR 410 handwheel Protection class IP54
IP54 = Protection against dust and splashwater