Vega MINITRAC 31 - 5 Connecting to power supply; 5.1 Preparing the connection

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5Connectingtopowersupply
MINITRAC 31 • Foundation Fieldbus
41782-EN-211203
5 Connecting to power supply
5.1 Preparing the connection
Alwayskeepinmindthefollowingsafetyinstructions:
•
The electrical connection must only be carried out by trained,
qualiedpersonnelauthorisedbytheplantoperator.
•
If overvoltage surges are expected, overvoltage arresters should
be installed.
Warning:
Onlyconnectordisconnectinde-energizedstate.
Note:
Installadisconnectingdevicefortheinstrumentwhichiseasyto
access. The disconnecting device must be marked for the instrument
(IEC/EN61010).
The instrument is designed in protection class I. To maintain this
protection class, it is absolutely necessary that the ground conductor
be connected to the internal ground terminal. Take note of the national
installation regulations.
Supply voltage and signal output are carried on separate connection
cables if reliable separation is required. The supply voltage range can
dierdependingontheinstrumentversion.
Thedataforpowersupplyarespeciedinchapter"Technical data".
General requirements
•
Make sure that the cable used has the required temperature resist-
anceandresafetyformax.occurringambienttemperature
•
Usecablewithroundcrosssectionforinstrumentswithhousing
andcablegland.Toensurethesealeectofthecablegland(IP
protectionrating),ndoutwhichcableouterdiameterthecable
gland is suitable for.
•
Useacableglandttingthecablediameter.
•
Unusedcableglandsdonotoersucientprotectionagainst
moisture and must be replaced by blind plugs.
Voltage supply
Forpowersupply,anapproved,three-wireinstallationcablewithPE
conductor is required.
Signal cable
Use for the signal output a cable according to the respective bus
specications.
Metric threads
Inthecaseofinstrumenthousingswithmetricthread,thecable
glandsarescrewedinatthefactory.Theyaresealedwithplastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
Safety instructions
Voltage supply via mains
voltage
Select connection cable
Cable glands