Chapter 6 - Operation
UNITROL 1020 User Manual 3BHS335648 E82 157
Communication \ VDC Monitor
VDC Monitor is a tool to analyze the VDC communication between the AVRs connected to the
same RS485 bus. The VDC communication should be enabled before using this tool.
1. Displays the AVR-ID number
and the actual compensation
used for regulation. The
compensation value will only
be used when the AVR is
operating in VDC mode.
2. Each LED number = the AVR-
ID 1 to 31 for each AVR
connected to the RS-485 bus.
A LED is lit when valid (error
free) VDC data packets are
being received from the AVR
whose AVR-ID matches the
LED number.
The LEDs indication is useful
for troubleshooting problems
when using VDC.
Green:
Q sharing on same bus
Yellow:
Q sharing on different bus
Red:
AVR is forced to AUTO
3. It selects the AVR-ID (or
LED) of the AVR from
which specific (Net ID, IM
Nominal and Iq rel) has to
be displayed.
4. This is the information displayed after the user selects an AVR-ID using the selector
explained in Item 3 (above).
All data displayed is real-time data. The Net ID shows Primary or Secondary Net
numbers according to the current status of the AVR. A special case applies if Net ID is
equal to zero, which means that the VDC data packets had communication errors or the
data packets from this particular AVR-ID are not being received at all. During the time
Net ID = 0, the LED for this AVR-ID is shown dark.
IM Nominal refers to the Nominal Machine Current and Iq Rel to the Reactive Current in
p.u. units.
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