Vanguard CT-7000 S3 - Manual (Page 22)

CT-7000 S3 USER’S MANUAL REV 1
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3.1.5. Analog and Digital Voltage Monitoring Connections
The analog voltage input “V1” can monitor a breaker’s DC control voltage during an operation.
The analog voltage input records the nominal DC voltage at no load and the minimum DC
voltage while the Trip or Close coil is energized. The nominal and minimal voltage readings are
printed on a tabulated report, and the analog waveforms are plotted in graphical format. This
allows the user to see the breaker’s DC control voltage “dip” under load conditions and helps
detect problems such as a poor connection or an excessive voltage drop during operation.
Please note that the maximum voltage that can be recorded is 250 Vdc.
The digital voltage input channels “V2” and “V3” can monitor the voltage status as “ON” or
“OFF” states. The voltage “ON” or “OFF” states are plotted on the graphical report. Three
voltage on/off events are also printed on the tabulated timing report. Typical analog (“V1”) and
digital (“V2”) voltage monitoring connections are shown in Figure 9.
Figure 9. Typical Analog and Digital Voltage Monitoring Connections