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SICK GLD20 Instrucciones De Funcionamiento página 31

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5.2
Notes on UL approval
8026844.1K1V/2024-02-08 | SICK
Subject to change without notice
The electrical installation must only be performed by electrically qualified person‐
nel.
Standard safety requirements must be observed when working on electrical
systems!
Only switch on the supply voltage for the device when the connection tasks have
been completed and the wiring has been thoroughly checked.
When using extension cables with open ends, ensure that bare wire ends do not
come into contact with each other (risk of short-circuit when supply voltage is
switched on!). Wires must be properly insulated from each other.
Wire cross-sections in the supply cable from the user's power system must be
selected in accordance with the applicable standards.
NOTE
Layout of data cables
Use shielded data cables with twisted-pair wires.
Implement proper and complete shielding concept.
To avoid interference, e.g., from switching power supplies, motors, clocked regula‐
tors and contactors, always use cables and layouts that are suitable for EMC.
Do not lay cables over long distances in parallel with voltage supply cables and
motor cables in cable ducts.
The IP enclosure rating for the device is only achieved under the following conditions:
The cables plugged into the connections are screwed tight.
The terminal chamber has to be sealed according to the instructions for "terminal
connection".
If these instructions are not complied with, the IP enclosure rating for the device is not
guaranteed!
UL approval
Table 2: UL approval
G20 products with DC voltage supply and with:
connector
cable
cable with connector
UL:
The device shall be supplied from an isolating
transformer having a secondary overcurrent
protective device that complies with UL 248 to
be installed in the field rated either:
a) max 5 amps for voltages 0 V ~ 20 V (0 V ~
28.3 V peak), or
b) 100 / Vp for voltages of 20 V ~ 30 V (28.3
V ~ 42.4 V peak)
Alternatively, they can be supplied from a
Class 2 voltage supply.
UL Environmental Rating: Enclosure type 1
For use in NFPA 79 Applications only
OPERATING INSTRUCTIONS
O P E R A T I N G I N S T R U C T I O N S | GLD20
en
31

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