Riken Keiki GD-84D-EX Series, Руководство по эксплуатации

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4. Installation 4-2 System design precautions
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<Do not install in improperly grounded systems>
When installing within a system chassis, make sure the system is properly grounded to Class D or
equivalent.
<Do not install in the presence of interference gases>
Do not install the product in locations where miscellaneous gases are present.
<Do not use cleaning products when cleaning this product>
When cleaning this product, do not use cleaning products.
4-2 System design precautions
CAUTION

Unstable power sources or noise may result in malfunctions or false alarms.

When designing systems based on or incorporating this product, be sure to incorporate the
information provided on this page and in the ‘System Construction Manual’.
<Use of a stable power source>
The product’s external output and alarm contacts may activate while the system stabilizes at power-on or
in the event of an instantaneous power failure. If you do not want the external output and alarm contacts to
activate, use a UPS (uninterruptible power system) or take appropriate measures on the receiving end.
Supply this product with the following power sources:
Power source
voltage 4 - 20 mA models : 24 V DC ± 10 % (main unit terminal voltage)
ET models
: PoE+ connection
EA models : 24 V DC ± 10 % (voltage of main unit terminal) or PoE+
connection (not to be supplied simultaneously)
Time allowed for
instantaneous
power failures Up to approx. 10 ms * Example of countermeasure:
Deploy an external UPS (uninterruptible
power system)or similar to guarantee
continuous operation and functionality.
Miscellaneous Do not use with power sources
subject to very high power loads or
high frequency noise. Example of countermeasure:
Where necessary, use a line filter or other
device. Keep the product away from noise
sources.
* To recover from an instantaneous power failure exceeding 10 ms, restart the product.
<Design accounting for heat dissipation>
If you plan to install the product in a closed instrument panel or similar space, install ventilation fans at the
top and bottom of the panel.
Install the fans so that the temperature inside the instrument panel remains below 40 °C. Account for the
heat produced by the unit itself.
<Lightning protection>
In factories or plants where cabling is configured as follows, damage may result in the event of lightning
strikes. The cables connected to the product may function as receiving antennas for the lightning:

When cables are installed outdoors

When cables are installed in the same duct as cables supplied from outside