Operating Instructions
Chapter
5
LD-MRS
Electrical installation
8012948/ZMQ0/2017-06-09
©
SICK AG · Germany · All rights reserved · Subject to change without notice
69
5.4
Perform electrical installation
•
Electrical connection may only be established or disconnected when not under voltage.
•
Specify and implement the wire diameter and the correct fusing according to valid stan-
dards.
•
For data cables only use shielded cables (twisted pair).
•
In order to prevent noise, do not lay data cables parallel to power supply or motor ca-
bles, e. g. in cable ducts.
•
Lay all cables such that there is no risk of tripping and all cables are protected against
damage.
•
Do not switch on the supply voltage for the LD-MRS before all connection works are fin-
ished and the wiring has been checked thoroughly
•
In applications with high solar radiation, please lay the cables in protective tubes.
5.4.1
Connect the supply voltage
Supply voltage requirements
The LD-MRS requires for operation a supply voltage of 9 to 27 V DC (function extra-low volt-
age in accordance with IEC 60364-4-41). The function extra-low voltage can be generated
by a power supply with a safety transformer in accordance with IEC 742.
Important
The output circuit of the power supply must be safely electrically isolated from the input
circuit, this feature is normally provided by a safety transformer in accordance with IEC
742.
The LD-MRS consumes the following power:
The optional CAN module consumes approximately 1.5 W at DC 8 to 50 V without a load.
Important
In order to ensure protection against short circuit / overload of the supply cable, dimension
and fuse the wire cross-sections accordingly. The valid standards must be observed.
Make sure that the voltage supply to which the LD-MRS will be connected, is switched
off.
1. Connect the supply cable, e. g. Part no. 2049823 (2 m (6.56 ft)), to the LD-MRS, see
2. Connect the supply cable voltage-free to the voltage supply.
In order to bridge distances greater than 20 m (65.6 ft) (cable no. 2049825), use an
extension cable at the consumer side between the supply cable and the voltage supply.
Important
If you remove the bunch pin plugs of the supply cable and connect the cores directly to
the terminal block, make sure to connect the shielding of the cable also at a suitable
ground point.
Process
Power consumption
Switch-on
typically 36 W (1.5 A at 24 V DC)
permanent operation
typically 8 W (0.34 A at 24 V DC)
permanent operation
max. 10 W (0.4 A at 24 V DC)
Tab. 5-5: Power consumption of the LD-MRS
