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

21
5 Connecting to power supply
POINTRAC 31 • 8/16 mA/HART - four-wire
43388-EN-180322
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
Warning:
Connect only in the complete absence of line voltage.
•
The electrical connection must only be carried out by trained
personnel authorised by the plant operator.
•
If overvoltage surges are expected, overvoltage arresters should
be installed.
Note:
Install a separating facility for the instrument which is easy to access.
The separating facility must be marked for the instrument (IEC/
EN 61010).
In this case, the instrument is designed in protection class I. To main-
tain 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 current signal 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
The 8/16 mA current output is connected with standard two-wire ca-
ble without screen. If electromagnetic interference is expected which
is above the test values of EN 61326 for industrial areas, screened
cable should be used.
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.
Safety instructions
Voltage supply via mains
voltage
Select connection cable
Cable glands