NOTE
If the heating voltage supply cables are particularly long, it may be necessary to gener‐
ally increase the input voltage (see formula for voltage drop) and install a 470 µF / 63 V
capacitor between 24 V and 0 V (in the connection unit, close to the sensor). This
allows for compensation for the voltage drop at the moment of switch-on.
6.5.4
Cable reserve on system plug
Allow for sufficient cable reserve of the supplied cables at the system plug. You can
easily exchange the device with the cable reserve if needed.
Keep the cable reserve only long enough that the system plug cannot be accidentally
plugged into an adjacent device when replacing the device! This prevents a device with
an incorrect configuration being put into operation. Experience has shown that 200 to
300 mm of cable reserve on the device is ideal.
6.5.5
General conditions for data interfaces
The following table shows the maximum recommended length of cables depending on
the selected data transmission rate.
Table 40: Maximum lengths of cables for the data interfaces
Interface type
Transfer rate
Maximum length of cable
RS-232
115.2 kBd
2 m
38.4 … 57.6 kBd
3 m
Max. 19.2 kBd
10 m
RS-422
Max. 115.2 kBd
500 m
Max. 38.4 kBd
1,200 m
NOTE
Use shielded cables (twisted pairs) with at least 0.25 mm².
To prevent interference factors, do not lay data cables over a longer route in parallel
with voltage supply cables and motor cables, in cable channels, for example.
6.6
Performing the electrical installation
6.6.1
Connection to the auxiliary interface (USB) and the Ethernet interface of the device
Pre-assembled cables are available for configuring the device using the auxiliary inter‐
face (USB) and the Ethernet interface.
NOTE
The USB interface of the device is used in industrial environments only as a service
interface for temporary use (e.g. for configuration, troubleshooting). Permanent use in
operational use of the system as a host interface is not intended.
NOTE
The recommended connecting cables and their associated technical data can be found
online at:
ELECTRICAL INSTALLATION
6
8013796/1ALS/2021-03 | SICK
O P E R A T I N G I N S T R U C T I O N S | LMS5xx
67
Subject to change without notice
