MR MSENSE DGA 2 - Electromagnetic Compatibility; Cable Recommendation; Routing and Preparing the Cables

6 Installation
Messko GmbH 202040 BA4001150/10 ENMSENSE
®
DGA 2/3
6.3.1 Electromagnetic compatibility
The device has been developed in accordance with applicable EMC stan-
dards. The following points must be observed in order to maintain the EMC
standards.
▪ The system's overvoltage protection must be effective.
▪ The system's ground connection must comply with all technical regula-
tions.
▪ For signal transmission, use shielded leads with individual conductors
(outgoing conductor / return conductor) twisted in pairs.
▪ Connect full surface of shielding to device or to a nearby grounding bar.
6.3.2 Cable recommendation
Please note the following recommendation from Messko GmbH when wiring
the device.
Excessive line capacitance can prevent the relay contacts from breaking the
contact current. In control circuits operated with alternating current, take into
account the effect of the line capacitance of long control cables on the func-
tion of the relay contacts.
The connection cables used must comply with a temperature resistance
within the permissible ambient temperature of -40...+60°C.
Cable Terminal** Cable type Max. length
Power supply 1, 2, 3 Unshielded
Analog outputs 4…12 Shielded 400m (<25Ω/km)
Relay* 13…27 Unshielded
Table6: Recommendation for connection cables
*) Observe lead capacitance.
**) Also refer to Terminal technical data [►Section 13, Page 90].
6.3.3 Routing and preparing the cables
Consider the position of the connections when preparing the cables (see
chapter Electrical connection [►Section 14.4, Page 97]).
Ensure that the length of the PE conductor (terminal 3) is at least 50 mm
longer than the supply voltage conductors (terminals 1 and 2).