105
FREQUENTLY ASKED QUESTIONS
What is the maximum distance for BACnet MS/TP or Modbus (RS-485) communication?
BACnet MS/TP or Modbus (RS-485) can reach a distance up to 1200 meters (4000’) with data rates at
100 kbps.
One (or more) of the PhaseChek
™
LEDs is red. What does this mean?
Any number of red lights indicates the PowerScout meter is wired incorrectly. Review the table in
PhaseChek in Section III of this manual for a description of the indicator lights.
How is the PowerScout meter powered?
All PowerScout™ instruments are line-powered. An internal power supply attached between L1 and L2
provides power to the unit.
Can the PowerScout be used to monitor single-phase loads?
The PowerScout meter can be used to monitor single-phase loads. Refer to Section II or III for detailed
setup information.
How many PowerScout instruments can be connected together?
Up to 127 PowerScout 3037 meters can be connected together on a BACnet MS/TP network.
Up to 247 PowerScout 3037 meters can be connected together on a Modbus RTU network.
How is hexadecimal (HEX) to decimal converted?
Use the Decimal to Hexadecimal conversion table in Appendix E of this manual.
What is true RMS?
RMS stands for "Root-Mean-Square." True RMS is the power from AC voltage/current that will produce
the equivalent amount of heat in a resistor as a DC voltage/current, whether sinusoidal or not. For
example, if a resistive heating element is rated at 15 kW of heat at 240VAC RMS, then the heat would be
the same if we applied 240V of DC instead of AC. A meter without true RMS will incorrectly read
distorted waveforms. All DENT Instruments meters measure true RMS.
How accurate are the PowerScout meters?
The PowerScout 3037 meter accuracy is <0.02%.Meets ANSI C12.20-2010
What is the lead length for RōCoil CTs?
The maximum lead length for the RōCoils is 30 meters (100’).
Can a three-phase balanced load be monitored with one CT?
This is not the best way to measure a three-phase load as it ignores imbalances in voltage and power
factor. However, if desired there is an Amp Multiplier Modbus register (44605) that can be set for
three (3), which will multiply the current by three and therefore amps, watts, VA, VARs will be 3X
greater.
How can I switch the PowerScout from BACnet to Modbus mode?
Using a PC running ViewPoint™ (or an RTU that can write to BACnet objects), write to object 10190 the
value 375 (to change to Modbus).
How can I switch the PowerScout from Modbus to BACnet mode?
Using a PC running ViewPoint™ (or an RTU that can write to Modbus registers), write to register 44612
the value 1833 (to change to BACnet).
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