Novatech Bitronics M87X Series, Manual

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ML0021 August 15, 2018
59
Copyright 2018 Bitronics, LLC
that selecting the 256 sample per cycle sampling rate disables all measurements
associated with bus 2 voltages (Volts A2, B2, and C2) and auxiliary voltages (Volts Aux1-
Gnd, Aux2-Gnd, and AuxDiff). Because the sampling rate is synchronized with the system
frequency, the sample rate (in samples per second) will vary with frequency. Note that for
M87x units, when a Digital Input from any module is selected, a total of 16 digital inputs will
be added to the Waveform file.
Comtrade Trace
WYE Definition
DELTA Definition (shown with Phase B
f )
Volts 1 A Voltage Bus 1 Phase A to Neutral Voltage Bus 1 Phase A to B
1
Volts 1 B Voltage Bus 1 Phase B to Neutral Always = 0
1
Volts 1 C Voltage Bus 1 Phase C to Neutral Voltage Bus 1 Phase C to B
1
Amps 1 A Amps 1 Phase A Current Amps 1 Phase A Current
Amps 1 B Amps 1 Phase B Current Amps 1 Phase B Current
Amps 1 C Amps 1 Phase C Current Amps 1 Phase C Current
Amps N Phase N Current Phase N Current
Volts 2 A Voltage Bus 2 Phase A to Neutral Voltage Bus 2 Phase A to B
1
Volts 2 B Voltage Bus 2 Phase B to Neutral Always = 0
1
Volts 2 C Voltage Bus 2 Phase C to Neutral Voltage Bus 2 Phase C to B
1
Amps 2 A Amps 2 Phase A Current Amps 2 Phase A Current
Amps 2 B Amps 2 Phase B Current Amps 2 Phase B Current
Amps 2 C Amps 2 Phase C Current Amps 2 Phase C Current
Aux In 1 Voltage Aux 1 to Ground Voltage Aux 1 to Ground
Aux In 2 Voltage Aux 2 to Ground Voltage Aux 2 to Ground
Dig In 0 1 - X Digital Input Module 0 input 1 - X Digital Input Module 0 input 1 - X
Dig In 1 1 - X Digital Input Module 1 input 1 - X Digital Input Module 1 input 1 - X
Dig In 2 1 - X Digital Input Module 2 input 1 - X Digital Input Module 2 input 1 - X
Dig In 3 1 - X Digital Input Module 3 input 1 - X Digital Input Module 3 input 1 - X
Dig In 4 1 - X Digital Input Module 4 input 1 - X Digital Input Module 4 input 1 - X
Dig In 5 1 - X Digital Input Module 5 input 1 - X Digital Input Module 5 input 1 - X
1
When the M87x is used on a DELTA (2-element system), one of the Phase Voltage inputs will be connected
to the Neutral Voltage input, and that Phase-to-Neutral voltage will then be zero. The remaining two Phase-
to-Neutral voltages then become Phase-to-Phase voltages. The reference phase does not have to be Phase
B.
5.4.1a Default Frequency Setting for Waveform Recorder
The Nominal System Frequency should be selected appropriately for the system in the
“Instrument Transformer Ratio” page (previously the "Advanced" tab) of the Configurator.
Normally the unit will modify the sample rate to track the frequency of any CT or VT signal
present. However, if there are no signals available for frequency tracking, the unit will
default to the Nominal System Frequency setting.
5.4.1b Indicating Waveform Records with Digital Outputs
Any of the outputs on the Digital Input / Output Module can be configured to indicate the
status of the recorder. Recorder status includes: Recorder Started, Recorder Completed,
Recorder Memory Low, and Recorder Active. When a waveform record is created, the
assigned output relay will be energized. When an output relay is assigned to indicate the
presence of a waveform record, it can no longer be controlled via protocol commands
.
If