NOTE
Limit the current flowing through a section of the safe sensor cascade to a maximum of
4 A!
If you connect a safe sensor cascade directly to the power source for the safety control‐
ler, then you must limit the current to 4 A by means of suitable measures.
The power supply must then either shut down automatically at currents above 4 A, or
you must insert a 4 A slow-blow fuse in-line.
Via PWRI power supply accessory (recommended)
Figure 29: Connection via PWRI power supply accessory
1
Flexi Loop power flow
2
MSTR power supply
3
Power supply
If you supply a safe sensor cascade via the PWRI power supply accessory, this acces‐
sory will monitor the current and shut down in case of overcurrent. In addition the oper‐
ating voltage in each section is monitored.
4.1.5
Division into sections
If higher currents are required, the safe sensor cascade can be divided into individual
sections (
see "Subdivision of the safe sensor cascade", page 13
4
DESIGN
30
O P E R A T I N G I N S T R U C T I O N S | Flexi Loop
8015836/YT10/2016-05-24 | SICK
Subject to change without notice