Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 120 of 201
Version: 25F
5.8 External 24 VDC power supply
The PSC1 module requires a power supply of 24 VDC (on this topic see SELV or PELV,
EN50178). During the planning and installation of the power supply unit to be used, attention is
to be paid to the following boundary conditions:
It is imperative the minimum and maximum tolerance on the supply voltage is observed.
Minimum: 24 VDC –
15%
20.4 VDC
Maximum: 24 VDC +
28.8 VDC
To achieve residual ripple on the supply voltage as low as possible, the usage of a 3-phase
power supply unit or an electronically regulated unit is recommended. The power supply unit
must satisfy the requirements according to IEC 61000-4-11 (voltage drop).
The connection cable must be designed according to the local regulations.
The PSC1 module can withstand an external voltage of 32 VDC (protected by suppressor
diodes on the input).
Safety instructions:
• The PSC1 module must be fused individually according to the data sheet.
Recommended type: single-pole thermo-magnetic circuit breaker with fast characteristic
Remark:
In all circumstances, safe electrical isolation on relation to 230 VAC or 400 VAC mains must be
ensured. For this purpose power supply units are to be selected that satisfy the standards DIN
VDE 0551, EN 60 742 and DIN VDE 0160. Along with the selection of a suitable unit,
attention must also be paid to equipotential bonding between PE and 0 VDC on the secondary
side.
Safety instructions:
• All GND connections on the devices that are connected to the inputs on the PSC1
module must be connected to GND on the PSC1 (power supply).
Inputs on the PSC1 are:
• Digital inputs
• Digital I/O
• Analogue inputs (on request)
• Encoder connections
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