SMA
Technologie AG
Electrical Connection
Installation manual
SC-100-13:SE2407
Page 33
The analog input of the external temperature sensor and both additional analog signal
inputs are not equipped with lightning and overvoltage protection as a standard
feature. This can be retrofitted as an option.
We also recommend an optimum protection level at the grid connection point by
installing combined overvoltage and lightning protection there as well.
Before measuring the insulation, the overvoltage protectors must be
removed or disconnected or the existing fuses must be removed!
We recommend using lightning and overvoltage protection for
the external
temperature sensor and for
both of the available analog inputs. This can be
ordered as an option.
When an external control voltage supply cable is connected, the lightning
and overvoltage protection at this voltage input is rendered useless! We
therefore recommend the option of retrofitting the device with combined
lightning and overvoltage protection!
The grid structure, in particular the special feature of the TT grid must be
observed.