Yaskawa YASNAC PC NC Connecting Manual - Manual (Page 16)

YASNAC PCNC Connecting Manual Preface/Table of Contents
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CAUTION
• The current capacity of 24V DC (external power unit for input/output contacts) is determined by
the number of contact points to be used. When the current capacity is low, install an additional
external power unit.
• An enclosure for this product should be designed and constructed to meet the following:
1. Use an airtight enclosure.
2. Limit the average temperature rise of air within the enclosure to less than 10
o
C (50
o
F)
compared to the ambient temperature.
3. Use a UL approved fan to circuate the air in a closed enclosure to improve cooling efficiency,
and to prevent abnormal heat rise.
4. Seal the cable inlet, door, etc. completely.
5. Since a CRT display attracts airborne particles due to its high voltage that could result in
malfunction, therefore, provide an enclosure capable of preventing dust from entering the CPU.
6. Ambient magnetic field may cause CRT screen fluctuations, therefore, prevent this with a
layout and magentism shield.
7.In PC NC Unit,printed circuit boards,various units may accumlate dust from air,may result in
malfunction,therfore ,make structures to prevent the entry of dust.
8.Install packing on the cable inlet,doors,back covers,etc. to eliminate gaps or openings.
Failure to observe these precautions may result in product failure.