System Product Description
HI 803 211 E Rev. 1.01.00 Page 39 of 110
SELV/PELV power supply unit
Redundant SELV/PELV power supply
unit
Alternative: 24 VDC power net
H 7034 mains filter
Fuse and power distribution module, see
Chapter 10
Alternatively: Connection for mono
components, observe decoupling!
Decoupling diodes if not included in the
power supply units
Figure 20: Redundant 24 V Power Supply
The power supply units must meet the requirements in accordance with SELV or PELV. The
power supply units must bridge voltage dropouts of up to 20 ms. HIMA power supply units of the
PS 1000 series are designed and suitable for a mean time to failure (MTTF) of 30 years. Power
supply units from other manufacturers must be checked to ensure that they meet the mentioned
requirements. The requirements for a 24 VDC power net are the same as those applying to
power supply units.
HIMA recommends using a H 7034 mains filter to protect the 24 V power supplies transient
interference. The filter must be installed close to the 24 V supply to suppress interferences
directly at the supply point.
The base racks are equipped with redundant L1+ and L2+ terminals to connect to redundant
power supply units, see Figure 15 and Figure 16. In doing so, protective separation of the power
supply units must be ensured.
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