Liquiphant FTL51B Electrical connection
Endress+Hauser 35
5.2.10 Connecting the cables
Required tools
• Flat-blade screwdriver (0.6 mm x 3.5 mm) for terminals
• Suitable tool with width across flats AF24/25 (8 Nm (5.9 lbf ft)) for M20 cable gland
A0018023
29 Example of coupling with cable entry, electronic insert with terminals
1 M20 coupling (with cable entry), example
2
Maximum conductor cross-section 2.5 mm
2
(AWG 14), ground terminal inside the housing +
terminals on the electronics
3
Maximum conductor cross-section 4.0 mm
2
(AWG 12), ground terminal outside the housing
(example of plastic housing with external protective ground connection (PE))
ød Nickel-plated brass 7 to 10.5 mm (0.28 to 0.41 in)
ød Plastic 5 to 10 mm (0.2 to 0.38 in)
ød Stainless steel 7 to 12 mm (0.28 to 0.47 in)
Pay attention to the following when using the M20 coupling
Following cable entry:
• Counter-tighten the coupling
• Tighten the union nut of the coupling with a torque of 8 Nm (5.9 lbf ft)
• Screw the enclosed coupling into the housing with a torque of 3.75 Nm (2.76 lbf ft)
5.3 Post-connection check
Is the device or cable undamaged (visual inspection)?
Do the cables used comply with the requirements?
Do the mounted cables have adequate strain relief?
Are the cable glands mounted and firmly tightened?
Does the supply voltage match the information on the nameplate?
No reverse polarity, is terminal assignment correct?
If supply voltage is present, is the green LED lit?
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