Siemens SINAMICS S120 - Customer Terminal Blocks -X55.1 and -X55.2

SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
406/528
7.2.3.2 Customer terminal blocks -X55.1 and -X55.2
Overview
Booksize Cabinet Kits are equipped with terminal -X55.1 instead of terminal -X55 or, in the case of Double Motor
Modules
1)
, with terminal block -X55.2 as well. The signals of the power unit are connected to these terminal blocks,
which are located in the terminal area of the Booksize Base Cabinet near the bottom of the Cabinet Module.
DC bus
Customer
terminal
block
Customer
terminal
block
internal
power supply
24 V DC
Auxiliary
voltage supply:
380 – 480 V 2AC
or 500 – 690 V 2AC
230 V AC
24 V DC
Customer terminal blocks -X55.1 and -X55.2 on air-cooled Double Motor Modules
1)
of Booksize Cabinet Kits
The terminal blocks provide not only a 24 V DC connection point, but also connections for temperature evaluation
and for the safety functions of the power unit. A cable cross-section of between 0.2 and 2.5 mm² can be connected to
the terminal blocks. The safety functions (-X55:3/4) are (depending on the order) either wired to option K82 or
connected to the voltage supply terminals.
The 24 V DC voltage at terminals X55.1:5-8 or X55.2:5-8 is supplied by the SITOP power supply unit which is a
standard feature of Booksize Base Cabinets. A DC voltage buffered by the DC link of the power units is not available
on Booksize units. The permissible current load on X55.1:5/6 or X55.2:5/6 is 250 mA for each Booksize Cabinet Kit.
Fuse protection for all Cabinet Kits in a Base Cabinet is provided by a common fuse with 4 A rating. Some of the
terminals might already be assigned if option L37 (DC interface incl. precharging circuit) and/or option K82 (Terminal
module for controlling the "Safe Torque Off" and "Safe Stop1" safety funktions) are ordered. In this case, however,
one terminal will still be available for customer assignment. The maximum permissible current-carrying capacity of the
terminal must be noted and cable installation must be planned carefully to ensure short-circuit protection.
In combination with a CU320-2 DP (option K90) or CU320-2 PN (option K95) Control Unit, the terminal block -X55 is
provided in addition to terminal block -X55.1 or -X55.2, thereby allowing access to the digital inputs / outputs of the
connected CU320-2 Control Unit near the bottom of the cabinet.
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1) Production of these Double Motor Modules from the Booksize Cabinet Kits range discontinued on 1st October 2013