Siemens SIMEAS Q80 Operating Instruction page 91

8.1 DC-Supply (10 V to 60 VDC)
SIMEAS Q80 7KG8080 is run on a DC supply voltage connected via a 3-pin terminal socket. This clamp terminal
should only be connected by a trained technician. The permitted supply voltage range is 10 V to 60 V DC.
3-pol terminal socket
The following notes on DC-SIMEAS 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. SIMEAS 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). If the minus pole of the
voltage supply source is connected to ground voltage, then grounding is ensured in this way. The included
desktop supply unit is designed in this way.
Note
Once SIMEAS 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 SIMEAS Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 09.02.2011
E-15