Danfoss ECL Comfort A315 Service Guide

© Danfoss | 2017.06 | 5
VI.LV.H1.02
Service guide ECL 296 / ECL 310 Modbus
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 denitions:
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 Surge protection requirement PT 3-PB-ST and PT 1X2+F-BE
Class 4 - surge voltage: network:
1,2uS/50uS
4KV 10KV (8uS/20uSec)
Short circuit current (42 ohm impedance) Much higher than 95,2A 10KA. (Seems to be 2 ohm impedance
tester)
Maximum continious voltage - core to
core (A, B and ref. GND in ECL)
> 3,5V and ≤ 7V 5,2Vdc
Output voltage limitation at 1 kV/μs
(core-core) spike
Output voltage limitation at 1 kV/μs
(core-earth) spike
Much less than 1KV ≤ 700V.
Note: “common signal” MUST NOT be
shorted with “PE (protective earth)” in
surge protector base part
≤ 55V
≤ 700V
Output voltage limitation at 1 kV/μs
(core-core) static
Much less than 1KV ≤ 15V
Output voltage limitation at 1 kV/μs
(core-earth) static
Much less than 1KV ≤ 30V
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 eld cables (both IN and OUT eld 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)

Danfoss ECL Comfort A315 Specifications

General

Brand	Danfoss
Model	ECL Comfort A315
Category	Controller
Language	English