Wiring Cerabar M HART
22 Endress+Hauser
4.4.3 Load
P01-PMx4xxxx-05-xx-xx-xx-000
Fig. 24: Load diagram, observe explosion protection.
➀ Power supply 11.5 to 45 V DC for devices for non-hazardous areas, 1/3 D, EEx d, EEx nA, FM XP, FM DIP, CSA XP
and CSA Dust-Ex
➁ Power supply 11.5 to 30 V DC for EEx ia, 1 D, 1/2 D 1/2G, FM IS and CSA IS
R
Lmax
Maximum load resistance
U Supply voltage
!
Note!
When operating via a handheld terminal or PC with an operating program, a minimum
communication resistance of 250 Ω must be taken into account.
4.4.4 Shielding/potential matching
• You achieve optimum shielding against interference influences if the shielding is connected on
both sides (in the cabinet and at the device). If potential equalization currents are expected in the
plant, only ground the shielding on one side, preferably at the transmitter.
• When using in hazardous areas, you must observe the applicable regulations.
Separate Ex documentation with additional technical data and instructions is included with all
Ex devices as standard.
4.5 Potential equalization
Ex applications: Connect all devices to the local potential equalization system.
Observe the applicable regulations.
4.6 Post-connection check
Perform the following checks after completing electrical installation of the device:
• Does the supply voltage match the specifications on the nameplate?
• Is the device connected as per → Section 4.1?
• Are all the screws firmly tightened?
• Are the housing covers screwed down tight?
The connected onsite display lights up as soon as voltage is applied to the device.
0
1522
1295
840
386
11.5
30 45
20
U
[V]
U – 11.5 V
R
L
max
22 mA
≤
[]Ω
R
L
max
➀
➁
40
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