Phoenix Contact SCK-M-U-1500V Handleiding (128 Pagina's)

Handleiding

SOLARCHECK family

60

PHOENIX CONTACT 105608_en_01

6.8 Power supply for the SOLARCHECK devices

NOTE:

Only use power supply units with safe isolation and SELV/PELV in accordance with

EN 50178/VDE 0160 (SELV/PELV).

Use shielded twisted pair cables for the supply cables.

Ground the 24 V supply just once on the power supply unit.

6.8.1 Design of the power supply

In addition to collecting data, the communication module also supplies power to the con-

nected measuring modules. Observe the following when selecting the power supply:

– Input voltage U

N

= 24 V DC (-10% ... +25%)

– For current consumption, all connected measuring modules must also be taken into

consideration.

Let us assume 22 mA for the communication module and the sum of the typical current con-

sumption of all connected measuring modules. To account for current peaks, multiply the

result by 3. This calculation applies if 24 V is supplied. In other cases, please refer to the cur-

rent consumption diagrams for the modules.

Figure 6-15 Performance characteristics of the SCK-C-MODBUS communication mod-

ule without connected measuring devices

0

100

200

300

400

500

600

700

0

5

10

15

20

25

30

35

40

0 5 10 15 20 25 30 35

45

50

P [mW]

I [mA]

U [V]

U = 21,6…30 V

N

P [mW]

I [mA]

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