Auxiliary Power Supply Modules; Design - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information

7.2.11 Auxiliary Power Supply Modules

7.2.11.1 Design

Auxiliary Power Supply Modules are generally used for large drive systems with high auxiliary power requirements.
They feed the auxiliary voltage supply system of the SINAMICS S120 Cabinet Modules with three auxiliary voltages:
·
Line voltage V
Line
·
Auxiliary voltage 230 V (AC voltage, single-phase),
·
Auxiliary voltage 24 V (DC voltage).
Among the components connected to this supply system are the fans of the SINAMICS S120 Chassis units
integrated in the Cabinet Modules. The auxiliary voltage supply system also provides the electronics modules with an
external voltage of 24 V DC. This is needed to run the electronics (for example, to maintain communication on bus
systems such as PROFIBUS or PROFINET) when the DC link is not charged.
The Auxiliary Power Supply Module is connected to the available line voltage (380 V to
690 V) on the plant distribution board.
The Auxiliary Power Supply Module includes the following components:
• Fuse-switch disconnector with fuse monitor for external evaluation.
• Three fuse-protected auxiliary voltages for the auxiliary voltage supply system:
• Transformer with 230 V output voltage.
• Voltage supply SITOP 24 V DC.
• 6-pole, pre-wired auxiliary voltage supply system, including accessories for looping
• PE busbar, nickel-plated (60 mm x 10 mm), including the link for looping through to the
Auxiliary Power Supply Module
Note:
On small drive systems with low auxiliary power requirements, it is often not meaningful to use an Auxiliary Power
Supply Module to provide the auxiliary voltage supply. In such cases, it is better to supply the auxiliary voltage from
the Line Connection Module. If the auxiliary supply is to be implemented in the Line Connection Module for drive
systems with low auxiliary power requirements, the auxiliary supply must be ordered as a separate option of the Line
Connection Module (order code K76 for LCM if all three voltages (line voltage 1AC, 230 V 1AC and 24 V DC) are
needed, or order code K70 if only the 1AC line voltage is required to supply the fans of the connected S120 Cabinet
Modules).
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Ó Siemens AG
(mains AC voltage, single-phase),
- 380 V – 690 V AC (depending on line voltage) to supply device fans
- 230 V AC to supply 230 V loads
- 24 V DC to supply electronics modules
through to the next Cabinet Module.
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