Phoenix Contact SCK-M-I-4S-20A handleiding

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SOLARCHECK string current measurement with SCK-M-I-…

105608_en_02 PHOENIX CONTACT 21

Also observe the input resistance of the analog input (200 kΩ) if you want to connect analog

devices that are not part of the SOLARCHECK device family.

Make sure that the connected analog device is electrically isolated from the supply of the re-

maining SOLARCHECK devices. Otherwise invalid values may occur on the analog input side.

3.2.4 Internal temperature measurement

The device-internal controller is equipped for temperature measurement. This means that

the device temperature inside the module can be monitored. The device is designed for op-

eration under temperature conditions ranging from -20°C to +70°C. From experience, de-

pending on the ambient conditions (ventilation situation, etc.) the temperatures inside the

device are approximately 10°C above the temperature outside the device.

To that effect normal device operation is ensured if the temperatures measured inside indicate

≤80°C. If the temperature inside the device exceeds 80°C, this may affect the function, electron-

ics, and service life of the device.

3.3 Data acquisition and data transfer

The acquired data is transferred to the SCK-C-MODBUS SOLARCHECK communication

module via an internal communication cycle. A proprietary protocol is used for transmission.

This protocol also ensures that power is supplied to the measuring module. For this reason, it

is only possible to operate the current measuring modules via the corresponding

SCK-C-MODBUS SOLARCHECK communication module (item no. 2901674). The

SOLARCHECK current measuring modules cannot be connected directly to a higher-level

control unit.

The internal communication cycle ensures that the measuring data in the communication

module is updated very quickly within 2 s. The data is acquired and then transferred at the

request of the communication module. It is then available in the communication module for

a higher-level controller via Modbus. For additional details on data retrieval, refer to Sec-

tions Section “SCK-internal communication cycle” on page 33 and Section “RS-485 com-

munication” on page 33.

3.4 Power supply

The SOLARCHECK current measuring modules are supplied via the communication inter-

face to the SOLARCHECK communication module (SCK BUS). The transmission protocol

includes a corresponding power transmission function, which ensures permanent operation

of the connected measuring modules. Observe the installation instructions in Section “In-

stalling the SCK-M-I-xx current measuring modules” on page 54 and the notes on designing

the power supply of the overall SOLARCHECK system in Section “Power supply for the SO-

LARCHECK devices” on page 60.

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