Vanguard DigiTMR - Manual (Page 20)

DIGITMR USER’S MANUAL REV 3
15
3.1.3. Analog and Digital Voltage Monitor Connections
The analog voltage input “V1” can monitor a breaker’s DC control voltage during an operation.
The analog input records the nominal DC voltage at no load and the minimum DC voltage while
the Trip or Close coil is energized.
Nominal and minimum voltage readings can be printed on a tabulated report. Analog
waveforms can also be plotted graphically. Using the reports, the user can see the breaker’s DC
control voltage “dip” under load conditions and can easily detect problems such as a poor
connection or an excessive voltage drop.
The digital voltage input “V2” monitors the voltage status as “ON” or “OFF” states and can
graph the results.
A typical analog voltage monitoring connection (V1) and a typical digital monitoring connection
(V2) are shown in Figure 6.
NOTE
Maximum voltage recorded is 255 Vdc.
Figure 6. Analog and Digital Voltage Monitoring Cable Connections