Electrical connection Liquisys M CPM223/253
28 Endress+Hauser
4.4 Alarm contact
4.5 Post-connection check
After wiring up the electrical connection, carry out the following checks:
a0006415
Fig. 25: Recommended fail-safe switching for the alarm contact
A Normal operating status B Alarm condition
Normal operating status:
Device in operation and no error message
present (alarm LED off)
• Relay energized
• Contact 42/43 closed
Alarm condition
Error message present (alarm LED red) or
device defective or voltage-free (alarm LED off)
• Relay de-energized
• Contact 41/42 closed
Device status and specifications Remarks
Are the transmitter or the cable externally damaged? Visual inspection
Electrical connection Remarks
Are the installed cables strain-relieved?
No loops and cross-overs in the cable run?
Are the signal cables correctly connected acc. to the wiring diagram?
Are all screw terminals tightened?
Are all cable entries installed, tightened and sealed?
Are the PE distributor rails grounded (if present)? Grounding at place of installation
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