Danfoss ECL Comfort 296 Manuale di servizio - Pagina 5

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Danfoss ECL Comfort 296 Manuale di servizio
Service guide
5. Grounding arrangements (to improve "general electrical safety"
and "communication quality") - the common signal (ref. GND)
must be connected directly to the protective ground (PE=
Earth), at the master device (ONE POINT ONLY).
6. Cables shield arrangements (to improve "general electrical
safety") - One end of each cable's shield must be connected to
protective ground (PE= Earth). Do not connect both ends of the
shield to PE as it forms an unwanted "group loop".

6.0 Installation class and surge / lightning protection

"To secure the Modbus electronics (ECL 296 / 310, repeater...) from
surge / lightning in the network, "external protection devices" must
be selected based on the installation class of the network" and rightly
installed in "each site".
Installation class 4 definitions:
Electrical environment where the interconnections are running as
outdoor cables along with power cables, and cables are used for
both electronic and electrical circuits.
"Surge protector requirements" for "installation class 4" (Modbus
network with ECLs):
Parameter
Class 4 - surge voltage: network:
1,2uS/50uS
Short circuit current (42 ohm impedance)
Maximum continious voltage - core to
core (A, B and ref. GND in ECL)
Output voltage limitation at 1 kV/μs
(core-core) spike
Output voltage limitation at 1 kV/μs
(core-earth) spike
Output voltage limitation at 1 kV/μs
(core-core) static
Output voltage limitation at 1 kV/μs
(core-earth) static
As per the above details, "PT 3-PB-ST and PT 1X2+F-BE" from
Phoenix meet the requirements. Similar products from other sup-
pliers can also be used.
Installation guide:
•
Outer field cables (both IN and OUT field cable wires) must
be connected to the "unprotected side" of the "external surge
protection device)
•
Indoor local cables (both IN and OUT cable wires - which are
well separated from mains supply wires) used to connect com-
mination part of electronics (repeater / ECLs) to the network,
must be connected to the "protected side" of the "external
surge protection device)
VI.LV.H1.02
ECL 296 / ECL 310 Modbus
Surge protection requirement
4KV
Much higher than 95,2A
> 3,5V and ≤ 7V
Much less than 1KV ≤ 700V.
Note: "common signal" MUST NOT be
shorted with "PE (protective earth)" in
surge protector base part
Much less than 1KV
Much less than 1KV
PT 3-PB-ST and PT 1X2+F-BE
10KV (8uS/20uSec)
10KA. (Seems to be 2 ohm impedance
tester)
5,2Vdc
≤ 55V
≤ 700V
≤ 15V
≤ 30V
© Danfoss | 2017.06 | 5