HB-37350-810-01-51F-EN SMX Installation manual.docx Page 154 of 234
Version: 50F
5.7 External 24 VDC – voltage supply
The SMX 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.
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:
• The SMX module must be individually protected by a 3,15A (min. 30 VDC) back-up fuse
which must be placed near by the terminals of the modules.
Recommended fuse type:
3.15A circuit breaker (Class B) or safety fuse (inert).
Comments:
Reliable galvanic isolation from the 230 VAC (120 VAC cULus) or 400 VAC network must be
guaranteed in any case. This requires the selection of power supply units complying with the
regulations DIN VDE 0551, EN 60 742 and DIN VDE 0160. Besides choosing a suitable device
you must also ensure equipotent bonding between PE and 0-VDC on the secondary side.
Safety note:
• All GND connections of the devices, which are connected to the inputs of the SMX
module must be connected to the GND of the SMX (voltage supply).
Inputs of the SMX are:
• Digital inputs
• Digital I/Os
• Analogue inputs
• Encoder connections
Comments:
The connections GND_ENC and AIN are not internally connected to GND!
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