User Manual 3PH HYD5000-HYD20000-ZSS
Rev. 1.1 16/03/2021
Identification: MD-AL-GI-00
Rev. 1. of 16/03/2021 - Application: GID
137/138
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COM (central LED): on
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SER (right LED): flashing on
Figure 122 - Irregular communication status between the adapter and remote server
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Check that the 4G signal is present in the installation location (the adapter uses the
Vodafone network for 4G transmission; if this network is not present or the signal is
weak, the SIM will use a different network or will limit the data transmission speed).
Ensure that the installation location is suitable for 4G signal transmission and that
there are no obstacles that could affect data transmission.
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Check the status of the 4G adapter and that there are no external signs of wear or
damage.
