Potential Equalization; Overvoltage Protection (Optional) - Endress+Hauser Cerabar M PMC51 Operating Instructions Manual

Cerabar M Analog
Endress+Hauser
4.2.3 Load
Load diagram
Power supply 11.5 to 45 V DC (versions with plug connectors: 35 V DC) for other types of protection and for uncertified
device versions
R Maximum load resistance
Lmax
U Supply voltage
4.2.4 Shielding/potential equalization
You achieve optimum shielding against disturbances if the shielding is connected on both sides (in
the cabinet and on the device). If potential equalization currents are expected in the plant, only
ground shielding on one side, preferably at the transmitter.
4.3

Potential equalization

Observe the applicable regulations.
4.4

Overvoltage protection (optional)

Devices showing version "NA" in feature 610 "Accessory mounted" in the order code are equipped
with overvoltage protection (see also Technical Information TI436P "Ordering information").
The overvoltage protection is mounted at the factory on the housing thread for the cable gland and
is approx. 70 mm (2.76 in) in length (take additional length into account when installing).
The device is connected as specified in the following graphic. For details, see TI103R/09/en,
XA036R/09/a3 and KA161R/09/a6.
R
Lmax
[ ] W
1456
1239
804
369
11.5 20 30 40 45
U – 11.5 V
£
R
Lmax
0.023 A
U
[V]
P01-xxxxxxxx-05-xx-xx-xx-003
Wiring
21