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Cube67 System Manual
20 V 2.5
3.2.1 Current-Carrying Capacity
The modules connected to the bus node are supplied with two voltages via the internal system
connection.
Table 3-11 : Current-carrying capacity
Current-carrying
capacity
Supply of
sensor power voltage
4 A Module electronics and sensors
Internal actuator supply 4 A Actuators
CAUTION:
Make sure to avoid feedback of the sensor supply voltage caused by external
power supply of the Cube67 system.
3.2.2 Maximum Expansion
The maximum length per branch may be maximum 10 m. Above a cable length of 5 m, measures are
required to protect the wire between the power supply unit and the bus node. In this case, a MICO
(Murrelektronik Intelligently Current Operator) may be used since, at cable lengths greater than 5 m, it is
not possible to assure safe overload cutoff in the bus node. An overview of available MICO variants is
contained in Table 3-12 below.
The MICO activates the circuit-breaker between the power supply unit and the bus node. It protects the
power supply unit in case of a fault, for example, an externally produced short-circuit in the Cube67
system line, and prevents an overload in the power supply unit.
Without MICO or an equivalent selective fuse, the length per branch of the internal system connection
may not exceed 5 m. The number of modules in a segment has no influence on the permissible
length.
A total of up to four segments each 5 m or 10 m long (with the bus node upstream of the MICO or an
equivalent selective fuse) can be operated on a bus node.
The permissible length of the internal system connection at a branch may be a
maximum of 10 m when a bus node upstream of the MICO or an equivalent selective
fuse is fitted. Without MICO or an equivalent selective fuse, the line length at a branch
is limited to 5 m.
If a MICO is connected on line side, the complete bus node is disconnected from the
power supply unit.
(All subordinate systems out of function).