Mettler Toledo M400 Guide De Configuration Rapide page 39

3 Mounting
The M400 transmitter is available as ½ DIN version.
For installation drawings refer to the Operation Manual.
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DANGER! Mortal danger by electric shock or risk of electrical shock: The maximum screw-
in depth of the mounting holes in the housing is 12 mm (0.47 inch). Do not exceed maximum
screw-in depth.
1. ½ DIN only: Mount the supplied cable glands at the enclosure.
2. Mount the transmitter. You have the following possibilities:
– Panel mounting, wall mounting or pipe mounting
4 Electrical Connection
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DANGER! Mortal danger by electric shock: Power off instrument during electrical connection.
1. Switch off supply voltage.
2. Connect mains supply to the terminals L, N, and (Ground).
3. Connect sensor to terminal block TB3.
4. Connect analog output, analog input and digital input signals to terminal block TB2.
5. Connect relay output signals to terminal block TB1.
6. Connect the HART modem to AO1+ / HART+ and AO1– / HART- for HART communication
(communication load 230 – 500 ohm). Notice polarity.
7. Connect FOUNDATION fieldbus to FF+ and FF– for FF communication. Notice polarity.
For terminal definitions refer to the Operation Manual.
This is a 4-wire-product with an active 4 – 20 mA analog output. Do not supply power to the
analog output terminals. M400 4-wire FF version has no analog outputs.
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WARNING! Do not disconnect the internal ground wire between the front and back modules.
Tightly secure an earth wire to the internal PE (Protective Earth) screw terminal.
The cross-section of the PE wire must be above 18 AWG (0.8 mm).
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