Endress+Hauser Deltabar FMD72, Operating Instructions Manual

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Deltabar FMD72 Electrical connection
23
7.4.2 Cable glands
Type of protection Cable gland Permitted cable diameter Permitted wire cross-sections
• Standard
• Ex ia
• Ex ic Plastic M20x1.5 5 to 10 mm (0.2 to 0.39 in) 0.5 to 2.5 mm
2
(20 to 14 AWG)
• Ex tD
• Ex nA
• FM approval
• CSA approval Metal M20 x 1.5 7 to 10.5 mm (0.28 to 0.41 in)
7.4.3 Overvoltage protection (optional)
Devices showing version "NA" in feature 610 "Accessory Mounted" in the order code are equipped
with overvoltage protection.
• Overvoltage protection:
– Nominal functioning DC voltage: 600 V
– Nominal discharge current: 10 kA
• Surge current check î = 20 kA satisfied as per DIN EN 60079-14: 8/20 m
s
• Arrester AC current check I = 10 A satisfied
NOTICE
Device could be destroyed!
►
Devices with integrated overvoltage protection must be grounded.
7.5 Connection data
7.5.1 Maximum load
In order to guarantee sufficient terminal voltage in two-wire devices, a maximum load resistance R
(including line resistance) must not be exceeded depending on the supply voltage U
0
of the supply
unit.
In the following load diagrams, observe the position of the jumper and the explosion protection: