Table of Contents
Technical
description
38
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VM50.EN004
Running hour counter................................................... 130
Timers............................................................................... 131
Combined overcurrent status..................................... 132
Self-supervision............................................................... 135
Diagnostics ............................................................ 136
Measurement functions.....................................................137
Measurement accuracy.............................................. 137
RMS values ..................................................................... 138
Harmonics and Total Harmonic Distortion (THD) ...... 139
Demand values............................................................. 139
Minimum and maximum values ................................. 140
Maximum values of the last 31 days and twelve
months ..................................................................................... 141
Voltage measurement modes.................................... 141
Power calculations ....................................................... 143
Direction of power and current.................................. 144
Symmetric components............................................... 145
Primary, secondary and per unit scaling................... 145
Current scaling...................................................... 146
Voltage scaling..................................................... 148
Analogue output (option) ........................................... 150
mA scaling example ............................................ 151
Control functions ................................................................152
Output relays ................................................................. 152
Digital inputs................................................................... 153
Virtual inputs and outputs............................................ 154
Output matrix................................................................. 155
Blocking matrix .............................................................. 156
Controllable objects ..................................................... 156
Local/Remote selection ...................................... 158
Auto-reclose function (79)........................................... 159
Logic functions .............................................................. 166
Communication .................................................................167
Communication ports .................................................. 167
Local port (Front panel)....................................... 168
Remote port .......................................................... 170
Extension port ........................................................ 171
Ethernet port.......................................................... 172
Communication protocols .......................................... 172
PC communication .............................................. 173
Modbus TCP and Modbus RTU ........................... 173
Profibus DP ............................................................. 174
SPA-bus................................................................... 176
IEC 60870-5-103 ..................................................... 176
DNP 3.0 ................................................................... 178
IEC 60870-5-101 ..................................................... 180
Ethernet port.......................................................... 181