Electrical connection Liquiline CM442/CM444/CM448
20 Endress+Hauser
Connecting the supply voltage
1. Route the power supply cable into the housing through the suitable cable entry.
2. Step 2 applies only to the 100 to 230 V AC power unit.
Connect the protective ground of the power unit to the threaded bolt specially provided
on the cable mounting rail.
3. Protective ground or grounding provided by customer (absolutely essential for 24 V
power unit, additionally recommended for 100 to 230 V AC power unit): Provide a
ground cable (min. 0.75 mm
2
(corresponding to 18 AWG))
1
! Guide the ground cable
also through the cable entry and connect it to the threaded bolt on the cable mounting
rail.
4. Connect the cable cores L and N (100 to 230 V AC) or + and ‐ (24 V DC) to the plug-in
terminals on the power unit in accordance with the wiring diagram.
21 Protective ground or grounding
connection
1 Protective ground of power unit
2 Serrated washer and nut
3 Protective ground / ground cable, provided by customer
(min. 0.75 mm
2
( 18 AWG))
1)
4 Serrated washer and nut
5 Mounting bolts
1) For a fuse with a rating of 10 A. For a fuse with a rating of 16 A, the protective ground / ground cable must have
a cross-sectional area of at least 1.5 mm
2
( 14 AWG).
NOTICE
Protective ground/ground cable with end sleeve or open cable lug
The cable can become loose. Loss of the protective function!
‣
To connect the protective ground or ground cable to the threaded bolt, only use a cable
with a closed cable lug as per DIN 46211, 46225, form A.
‣
Never connect the protective ground or ground cable to the threaded bolt with an end
sleeve or an open cable lug!
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