SIEMENS
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Siemens NC 62 · 2016
SINUMERIK CNC
Supplementary components
SITOP power supply
> Stabilized power supplies
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Overview
The 24
V power supply units from the SITOP range are optimized
for industrial use and operate on the switched-mode principle.
Due to the precisely regulated output voltage, the devices are
even suitable for the connection of sensitive sensors. Different
versions are available depending on the output current and
specific application.
In some cases, functional expansion is possible with add-on
modules. For example, to protect against long supply system
outages, 6 A, 15 A and 40 A DC UPS modules are available with
external buffering by rechargeable batteries and maintenance-
free SITOP UPS500 with capacitor technology. 48 V power
supplies round off the SITOP product range.
The SITOP PSU400M power supply unit with 600 V DC input is
suitable for use on frequency converters as an efficient DC/DC
converter.
It converts the DC link voltage to a stabilized 24 V DC thus
allowing, for example, specific emergency retraction move-
ments to be performed in the event of a mains failure. This is
possible because the control system and the drive electronics
continue to receive a power supply for as long as there is
sufficient energy stored in the DC link.
The wide DC input range (200 V to 900 V DC) and the high
efficiency level (up to 96 %) ensure efficient use of the DC link
energy. The compact, rail-mounted device is versatile in its
application thanks to its high overload capability with 50 % extra
power for 5 s/min, its comprehensive range of functions and its
rugged construction. The selectable ON delay which ensures
that the converter's DC link is not loaded immediately during
starting is one of the features that makes it ideal for operation on
SINAMICS frequency converters.
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Benefits
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High level of efficiency
The efficiency of up to 96 % keeps the current consumption
low and the control cabinet cool.
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Easy installation
The low weight and mounting accessories support fast and
therefore low-cost installation.
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Low space requirements
The high power ratio means that the devices only require
minimal space in the control cabinet and in the machines.
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Accurate output voltage
The output voltage of 24 V DC remains accurate even under
conditions of extreme voltage variation. The loads are pro-
tected from overvoltage spikes which lengthens the lifetime
and reduces downtimes.
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Low residual ripple
The low residual ripple of less than 0.4 % supports voltage-
sensitive loads.
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Integrated short-circuit protection
No additional protection of the cables in the 24 V DC circuit is
required.
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Safety isolation
The UA output is electrically isolated from the input (output
voltage SELV acc. to EN 60950). Dangerous voltages cannot
arise due to electrical isolation at the output.
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Meets the requirements of national and international
standards, e.g.:
- CE marking in accordance with 89/336 EEC und 73/23 EEC
- UL/cUL (CSA) approval
- FM approval (Factory Mutual)
- Marine approval
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No release of silicone
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More information
You will find further information in Catalog KT 10.1, on the
Internet or in the Siemens Industry Mall:
/sitop
/industrymall
© Siemens AG 2016