Power supply
The transmitter box is supplied with a nominal input voltage of 24 VDC. The power supply and the protective earth of the device are connected via the 3-pin voltage socket (X40).
Pin | Signal | Description |
|---|---|---|
3 |
| Protective earth |
2 | - | Negative pole power supply 24 V |
1 | + 24 V | 24 V power supply, positive pole |
The connector for the power supply is specified for 8 A and can accept wire cross-sections up to 1.5 mm2 with ferrules without collars. When using ferrules with collars, the wire cross-section is reduced to 1 mm2. Use 1.5 mm2 or 1 mm2 for long supply lines to achieve a low voltage drop on the supply lines. At least 22 V should be present at the power supply plug of the transmitter box so that the transmitter box remains switched on in the event of voltage fluctuations. The plug is included in the scope of delivery. You can obtain a replacement plug from your Beckhoff Sales using the following ordering option:
- C9900-P944: Power supply connector for CU8xxx, 3-pin connector with spring-cage connection for the external supply cables
The P10 LED is located above the interface. It provides information about the status of the power supply. The LED indicates the following states:
- LED is off: no supply voltage
- LED lights up green: 24 VDC applied
