Operating Instructions

Operating Instructions Safety Systems
MGB2-L1…-BR.-… / MGB2-L2…-BR.-… and MGB2-L1…-BP.-… / MGB2-L2…-BP.-…
30
(Translation of the original operating instructions) 2500233-01-05/19
13.4. Fuse protection for power supply
The power supply must be provided with fuse protection depending on the number of devices and current required for the
outputs. The following rules apply:
Max. current consumption of an individual device I
max
I
max
= I
UB
+ I
IMP
+ I
FO1A+FO1B
I
UB
= Device operating current (80mA) + monitoring outputs (4x max. 50mA) + controls
I
FO1A+FO1B
= Load current of safety outputs FO1A + FO1B (2xmax. 150mA)
I
IMP
= Solenoid (max. 375mA)
BR
Max. current consumption of a switch chain Σ I
max
with star wiring
Σ I
max
= I
FO1A+FO1B
+ n x I
UB
+ n x monitoring outputs + n x I
IMP
n = Number of connected devices
Assignment of the currents to the fuse circuits
Current Fuse circuit F1 Fuse circuit F2
I
UB
80 mA
I
OD,OT,OL,OI
= (4 x max. 50 mA)
I
controls
= max. 10 mA
(per control)
I
indicators
= max. 5 mA
(per indicator)
I
FO1A+FO1B
(2 x max. 150 mA)
I
IMP
I
solenoid
= 375 mA
13.5. Requirements for connection cables
CAUTION
Risk of damage to equipment or malfunctions as a result of incorrect connection cables.
Ì On the usage of other connection components, the requirements in the following table apply.
EUCHNER provides no warranty for safe function in case of failure to comply with these require-
ments.
Observe the following requirements with respect to the connection cables:
Parameter Value Unit
Conductor cross-section, min. 0.25 mm²
R max. 60 W/km
C max. 120 nF/km
L max. 0.65 mH/km