Siemens SICAM Q80 Operating Instruction page 17

Supply for DC-variant (12 V to 60 VDC)
9.1
The supply for the DC variant of SICAM Q80 7KG8080 is connected via a 3-pin terminal socket. The permitted supply
voltage range is 12 V to 60 V DC.
3-pole terminal socket
The following notes on DC-SICAM Q80 7KG8080 power supply must be observed:
The supply line must be a low-resistance cable with adequate cross-section. Any extra filters connected in the
supply circuit may not have series inductivities above 1mH. Otherwise, an additional parallel capacitor is
needed.
The terminal is protected against misconnection.
If the power supply is provided by the source to be measured, the measurement ends automatically if there is a
longer power outage. SICAM Q80 7KG8080 can be configured to resume measurement independently upon
return of power.
The device is grounded via the top-hat mounting. This grounding has no safety function, but is required in order
to ensure the measurement accuracy and the electromagnetic compatibility (EMC).
The contact to function ground on the 3-pin terminal block should only be connected if it is not possible to
connect ground via the top-hat rail. Otherwise, leave this contact open.
Note
Once SICAM Q80 7KG8080 is grounded, the supply sources are no longer isolated but referenced
to ground voltage.
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System architecture
Power Quality Recorder SICAM Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 12.01.2015
E-17