Vanguard CT-6500 - Manual (Page 11)

CT-6500 Operating Instructions
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NOTE
The CT-6500 can detect insertion resistors ranging from 10 to 7,000 Ohms.
Resistances over 7,000 Ohms are detected as an open contact.
3.2 Mechanical Measurement Results
Under the Time Travel Mode the digital, transducer channel provides the following test results:
n Breaker stroke
n Over travel
n Bounce back
n Contact wipe
n Contact velocity
Breaker contact speed calculations are based upon a contact's travel distance over a period
of time, which is defined by the manufacturer's specifications.
3.3 Analog Voltage Input Results
The analog voltage, input channel, “V1” measures the breaker's DC control voltage during an
operation. Printed voltage readings include nominal voltage, when the supply voltage has no load;
and minimum voltage, when the supply voltage is under load or when a coil is energized.
The “V1” connection allows the user to monitor the DC power supply’s voltage fluctuations during
a breaker operation. The feature is effective in detecting the breaker’s power supply problem,
which normally can not be seen by using a voltmeter.
NOTE
Voltage readings can range from 1 to 255 Vdc.
3.4 Digital Voltage Input Results
The digital voltage, input channel, “V2” monitors the voltage status as “ON” or “OFF” conditions
and graphs the result. A voltage level above 30 Vdc is considered as the “ON” state. The input
channel is dedicated to monitor the breaker’s auxiliary switch action during a breaker operation.
NOTE
Input voltage ranges from 1 to 300 Vac/dc.
3.5 Initiate Current Results
The CT-6500 not only plots the trip or close current waveforms, but also prints the steady-state
current readings of the trip and close coils during an operation. A typical circuit breaker timing
report is shown on Figure 10.0.