Overcurrent Protection - Siemens SINAMICS S120 Equipment Manual

Component
Additional system components
TM15 (without digital outputs)
per digital output
TM31 (without digital outputs)
per digital output
TM41 (without digital outputs)
per digital output
DMC20 (+ 5 x DRIVE-CLiQ)
VSM10
CBC10
CBE20
The values specified refer to Motor Modules/Line Modules with internal/external air cooling.
9.3.4

Overcurrent protection

Cables on both the primary and the secondary side of the power supply unit must be
protected from overcurrent. Primary side protection must be implemented according to the
manufacturer's instructions. Secondary side protection must be rated to deal with the actual
conditions. In particular:
● Loading due to loads, possibly the simultaneity factor in response to machine operation
● Current carrying capacity of the conductors used and cables in normal and short-circuit
● Ambient temperature
● Cable bundling (e.g. laying in a common duct)
● Cable laying method to EN 60204-1
EN 60204-1, Section 14, can be used to determine the overcurrent protection devices.
Circuit-breakers from the Siemens NSK catalog are recommended as overcurrent protection
devices on the primary side, and miniature circuit-breakers or SITOP select 6EP1961-2BA00
as overcurrent protection devices on the secondary side. The MCBs can be selected
according to Siemens catalog "BETA Modular Installation Devices - ET B1".
The 24 V DC connection of the
● Line Modules
● Motor Modules
● DC link components
is realized via the integrated busbars. The current carrying capacity of these busbars is 20 A.
The supply can be realized in two ways:
Booksize power units
Manual, (GH2), 06/2008, 6SL3097-2AC00-0BP6
conditions
Cabinet Design and EMC Booksize
9.3 24 V DC supply voltage
Typical current consumption [A
0.15
0.1
0.2
0.1
0.2
0.1
0.15
0.15
-
-
]
DC
505