28
Optional Connections
Characteristics of the Meter interface
The current transformer may not exceed a maximum output or secondary current of 200 mA. The input /
rated current is calculated by the maximum amount of power that is to be measured and has to be selec-
ted for each measuring point.
The current transformer's rated measuring ratio can be defined for each current transformer input.
The current transformers have to be set up in a way so that only one current-carrying conductor is measu-
red. Cables with multiple wires cannot be measured.
The maximum cable length between the current transformers and Solar-Log™ depends on the cable dia-
gram and the load of the current transformer.
We recommend a maximum cable length of 30 meters with a diameter of 0.75 mm
2
for our products.
For other current transformers, please consult the manufacturer's specifications in regard to cable length
and the wiring diagram.
Note!
Due to the lack of a voltage supple for the measurements, only the apparent power
– not the active power – is measured. Since in most cases the active power should
be measured, we recommend measuring with a power meter when there is a large
percentage of reactive power.
Current transformers from Solare-Datensysteme GmbH
Solare-Datensysteme offers the following current transformers that are specially tailored to the Solar-Log™
Meter:
Current transformer
Name Description Article
Number:
Solar-Log™ CT 16 A Current measurement 16 A, transformer: 16A/
200mA
255639
Solar-Log™ CT 100 A-c Current measurement 100 A, transformer: 100A/
200mA
sealed transformer
255640
Solar-Log™ CT 100 A-o Current measurement 100 A, transformer: 100A/
200mA
open transformer (folding mechanism)
255638
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