Danfoss ECL Comfort 310 Manuel d'entretien - Page 5

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Danfoss ECL Comfort 310 Manuel d'entretien

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

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