
Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx
Page 185 of 260
Version: 25F
5.7 External 24 VDC
– voltage supply
The SMX 100 module requires a 24 VDC power supply with PELV characteristic in accordance
to EN50178. Please comply with the following boundary conditions when planning and installing
the specified power supply unit:
Strictly comply with the minimum and maximum supply voltage tolerance.
Nominal voltage
DC 24 V
Minimum: 24 VDC
– 15%
20,4 VDC
Maximum: 24 VDC + 20%
28,8 VDC
We recommend the use of a 3-phase power supply unit or an electronically controlled device to
achieve an as little as possible residual ripple of the supply voltage. The power supply unit must
meet the requirements acc. to EN61000-4-11 (voltage dip).
Connecting cables must comply with local regulations.
The interference voltage resistance of the SMX module is 32 VDC (protected by suppressor
diodes at the input).
Safety note:
Each circuit board of a module must be supplied separately with the supply voltage (and
safety device)! The respective terminals are thereby marked by
“U24_ext”;
two adjacent
terminals
“U24_ext” in a plug are internally bridged.
Safety note:
•
The 24V DC supply connections of the SMX module must be individually protected
with an external fuse 3.15A (min 30 VDC) and must be placed near by the terminals
of the modules.
Recommended fuse type:
3.15A circuit breaker (Class B) or safety fuse (inert).
•
Depending on the electricity requirements, fuses can be used based on total
requirement or for each I/O group.
3,15A
3,15A
3,15A
3,15A
3,15A
3,15A
Connection example with separate IO supply!
(when connecting IO's with high current consumption)
or
Connection example with bridged IO supply!
(when connecting IO's with high current consumption)
Class B
Class B
Class B
Class B
Class B
Class B