Vanguard CT-6500 S2 - Manual (Page 11)

CT-6500 Series 2 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
In the Time Travel Mode, the digital transducer channels provide the following test results:
- CB contact stroke
-
CB contact over travel
- CB Contact bounce back
- CB Contact wipe
- CB 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.
NOTE
When the resistor type transducer channel is used, the test results are shown as
transducer channel 1.
CB contact mechanical measurement can be shown in “English” or “Metric” units.
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. This feature is effective in detecting breaker power supply problems, which
normally can not be seen by using a voltmeter.
NOTE
Printed voltage readings can range from 0 to 255Vdc.
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 30Vdc is considered as the “ON” state.
The input channel is dedicated to monitor the breaker’s auxiliary switch action during a breaker
operation.
NOTE
The input voltage ranges from 0 to 300Vdc or peak ac.
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 in Figure 11.0.