Supply of the UPS (Uin)
An external power supply unit is required to supply the UPS with a 24 V DC voltage (-15 % / +20 %). Connect the external power supply to the UPS Uin input. Connect the loads to the outputs U1out and U2out.
Fig.11: Connection example for power supply of the UPS via Uin input.Standard-compliant wiring (PELV/UL)
Wire the UPS in the control cabinet in accordance with the standard EN 60204-1:2006 PELV = Protective Extra Low Voltage:
- The "PE" and "0 V" conductors of the voltage source for a UPS must be at the same potential (connected in the control cabinet).
- Standard EN 60204-1:2006, section 6.4.1:b stipulates that one side of the circuit, or one point of the energy source for this circuit must be connected to the protective conductor system.
The CU81x0 UPS can be used in areas where special UL requirements must be met. Applications without special UL requirements are not affected by UL regulations.
UL requirements:
- An external overcurrent protection of 20 A is required for the UPS input (Uin).
- The temperature resistance of the copper cables must be at least 70 °C.
Selection and dimensioning of the external power supply
The external power supply must be dimensioned so that it can cover both the maximum power consumption of the connected devices and the additional power consumption for charging the UPS. Beckhoff power supplies: https://www.beckhoff.com/power-supplies
Technical data | CU8110-0120 |
|---|---|
Power consumption during charging (without load) | max. 3.2 A |
Output current | max. 4.5 A |
Fuse (internal, input) | electronic 10 A |
Fuse (internal, output) | electronic 5 A |
If, for example, a CX5140 with a power consumption of 23 W (= 0.96 A) is connected, the calculation looks as follows: 0.96 A + 3.2 A = 4.16 A. In this calculation example, at least a 4.16 A power supply is required for the CX5140. A power supply with 5 A is recommended.
If a C6017 (Intel Atom® x5-E3930 1.3 GHz) with a power consumption of 14 W (= 0.58 A) is connected, at least a 3.78 A power supply is required: 0.58 A + 3.2 A = 3.78 A. A power supply with 5 A is recommended.
Grounding
In case of mounting on a DIN rail, the UPS is grounded by grounding springs on its rear side. Ground the DIN rail in the control cabinet accordingly. A UPS with a mounting plate (optional) is grounded via the grounding screw.