Operating Instructions
LMS5xx 
Electrical installation
8013796/ZM63/2017-05-09 © SICK AG · Germany · All rights reserved · Subject to change without notice 77
Chapter 6
6.5.3 LMS500: Wiring the system connector
Reduced enclosure rating IP!
If the system connector is removed, the LMS500 is no longer compliant with the enclosure 
rating IP 65. 
 To prevent damage due to the entry of moisture and dirt, only open the system 
connector in dry, clean surroundings.
 If necessary, pre-wire and fit the system connector in suitable surroundings.
Prerequisites on the device for enclosure rating IP 65
 The system connector is plugged on the device, its two screws are tightended.
 The cables in the cable entries have a suitable outside diameter and are fixed by the 
lock nuts. If a cable entry is not used, it must be fitted with a blind plug that is fixed by 
the lock nut (as in the delivery condition).
 The cable plugged into the M12 round plug-in connection (Ethernet) is screwed tight. 
If the conncetion is not used, it must be fitted with a protective plug that is screwed tight 
(as in the delivery condition).
 The black, round cover of the USB auxiliary interface ("USB" connection) on the front is 
screwed tight.
1. Ensure the power supply to which the LMS500 is connected is switched off.
2. Remove the system connector on the backside of the device. For this purpose undo the 
two fixing screws (Fig. 10.3.1 on page 107) and pull the system connector carefully off 
the device upwards.
3. The M16 cable entry (metal) has an earth connection to the device. If a screened 
connection cable is used, as necessary connect the screen braid on the cable to the 
cable entry. For this purpose, shorten the screen braid as appropriate before 
assembling the cable entry and fit over the plastic insert for the cable entry.
4. Undo the fitting for the M16 cable entry.
5. Pull the cable for supply voltage and switching outputs with maximum outside diameter 
 10 mm through the plastic insert for the M16 cable entry.
6. Connect electrically isolated wires to the both terminal blocks.
7. If necessary, connect screen braid on the cable to the cable entry.
8. Fit M16 cable entry fitting and tighten.
9. Carefully re-fit the system connector to the LMS500.
10. Tighten the fixing screws for the system connector.