Liquiline CM442/CM444/CM448 Electrical connection
Endress+Hauser 27
Connecting the supply voltage
1. Route the power supply cable into the housing through the suitable cable entry.
Step 2 only applies for the 100 to 230 V AC power unit.
2. Connect the protective ground of the power unit to the threaded bolt specially provided on
the cable mounting rail.
3. Protective ground or grounding at the mounting location (absolutely essential for 24 V
power units, additionally recommended for 100 to 230 V AC power unit): You must
provide a ground cable (min. 0.75 mm
2
(corresponding to 18 AWG)). Guide the ground
cable also through the cable entry and connect it to the threaded bolt on the cable mounting
rail (→ å 38).
4. Connect the cable cores L and N (100 to 230 V AC, 24 V AC) or + and - (24 V DC) to the
plug-in terminals on the base module in accordance with the wiring diagram.
Protective ground/ground cable with wire end ferrule 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 a wire end
ferrule or an open cable lug!
a0013251
Fig. 38: Protective ground or grounding connection
1
2
3
4
5
Protective ground, mounted at the factory
Serrated washer and nut
Protective ground / ground cable, provided by the customer
(min. 0.75 mm (corresponding to 18 AWG))
Serrated washer and nut
Threaded bolt
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