Wiring; Terminal Assignment - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Electrical connection
22
6.3.6

Wiring

WARNING
L
Supply voltage might be connected!
Risk of electric shock and/or explosion!
‣
If the device is used in hazardous areas, make sure to comply with national standards
and the specifications in the Safety Instructions (XAs). The specified cable gland must
be used.
‣
The supply voltage must match the specifications on the nameplate.
‣
Switch off the supply voltage before connecting the device.
‣
If necessary, the potential matching line can be connected to the outer ground terminal
of the transmitter before the device is connected.
‣
A suitable circuit breaker should be provided for the device in accordance with IEC/EN
61010.
‣
The cables must be adequately insulated, with due consideration given to the supply
voltage and the overvoltage category.
‣
The connecting cables must offer adequate temperature stability, with due
consideration given to the ambient temperature.
‣
Only operate the device with the covers closed.
Connect the device in the following order:
1. Release the cover lock (if provided).
2. Unscrew the cover.
3. Guide the cables into the cable glands or cable entries. Use a suitable tool with width
across flats AF24/25 (8 Nm (5.9 lbf ft)) for the M20 cable gland.
4. Connect the cable.
5. Tighten the cable glands or cable entries so that they are leak-tight. Counter-tighten
the housing entry.
6. Screw the cover securely back onto the connection compartment.
7. If fitted: tighten the screw of the cover lock using the Allen key 0.7 Nm (0.52 lbf ft)
±0.2 Nm (0.15 lbf ft).
6.3.7

Terminal assignment

Single compartment housing
3
2
1
 17 Connection terminals and ground terminal in the connection compartment
1 Positive terminal
2 Negative terminal
3 Internal ground terminal
Liquiphant FTL51B HART
A0042594
Endress+Hauser