Table Of Contents - Phoenix Contact SCK-C-MODBUS User Manual

1 Introduction ................................................................................................................................9
2 General notes on PV systems ..................................................................................................11
3 Solarcheck string current measurement with SCK-M-I-... ........................................................17
4 Solarcheck string voltage measurement with the SCK-M-U-1500V .........................................25
5 SCK-C-MODBUS Solarcheck communication module ............................................................31
105608_en_00

Table of contents

1.1 Product overview ................................................................................................... 9
1.2 Area of application................................................................................................. 9
1.3 General safety notes............................................................................................ 10
2.1 Typical structure of large PV systems and PV power stations ............................. 11
2.2 Data collection in large PV systems .................................................................... 15
3.1 Safety notes for the device .................................................................................. 17
3.2 Function .............................................................................................................. 17
3.2.1 Current measurement .......................................................................... 18
3.2.2 Digital input ......................................................................................... 20
3.2.3 Analog input ......................................................................................... 20
3.2.4 Internal temperature measurement ...................................................... 21
3.3 Data acquisition and transfer ............................................................................... 21
3.4 Power supply ....................................................................................................... 22
3.5 Technical data ..................................................................................................... 22
4.1 Function............................................................................................................... 25
4.1.1 Voltage measurement .......................................................................... 25
4.1.2 Note on the parallel connection of multiple voltage measuring
devices in a system .............................................................................. 27
4.2 Data acquisition and transfer ............................................................................... 28
4.2.1 Representation of voltage values at the analog output ......................... 28
4.2.2 Step response time ............................................................................. 29
4.3 Power supply ....................................................................................................... 29
4.4 Technical data ..................................................................................................... 30
5.1 Function............................................................................................................... 31
5.2 Data acquisition and transfer ............................................................................... 31
5.2.1 SCK-internal communication cycle ...................................................... 33
5.2.2 RS-485 communication ....................................................................... 33
5.2.3 Register addresses .............................................................................. 35
5.3 Power supply ....................................................................................................... 37
5.4 Technical data ..................................................................................................... 38
5
PHOENIX CONTACT