Humidity; Mechanical Vibration; Mounting Position - HEIDENHAIN TNC 415 Technical Manual

– Cooling by blowing external air through the control cabinet to replace the internal air. In this
case the ventilator fan must be mounted so that the warm air is extracted from the control
cabinet and only filtered air can be drawn in. HEIDENHAIN advises against this method of
cooling, since the function and reliability of electronic assemblies are adversely affected by
contaminated air (fine dust, vapours etc.). In addition to these disadvantages, a filter which is
not adequately serviced leads to a loss in cooling efficiency. Regular servicing is therefore
absolutely vital.

2.3 Humidity

Permissible humidity:
In tropical areas it is recommended that the TNC is not switched off, so that condensation is avoided
on the circuit boards. The heat generation prevents condensation and has no further disadvantages.

2.4 Mechanical vibration

Permissible vibration:

2.5 Mounting position

Note the following fundamental points on mounting:
- mechanical accessibility,
- permissible environmental conditions,
- electrical noise immunity,
- the electrical regulations which are in force in your country.
3-10 TNC 407/TNC 415/TNC 425
Incorrect
LE
Obstructive
elements
Heat generating
elements
< 75 % in continuous operation,
< 95 % for not more than 30 days p.a. (randomly distributed).
< 0.5 g
2 Assembly hints
Correct
LE
01.98