Vanguard CT-7000 - Manual (Page 11)

CT-7000 Operating Instructions
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3.0 Test Result Tabulation
3.1 Electrical Measurement Results
Under the Time Travel Mode, each CT-7000 contact channel provides the following test
results:
n Contact Close time
n Contact Open time
n Insertion Resistor Contact Open and Close times
n Contact Bounce time
n Resistor On time
n Contact Spread time
NOTE
The CT-7000 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.
A CT-7000 not only calculates simple distance over-time speeds, but can also support other
formulas. An example is the Siemens SPS2 breaker calculation formula:
V=12.2 x a/b
The formula and analysis point can be stored in a test plan for use later in the field.
NOTE
If operators use a breaker test plan (See paragraph 9.13) during testing, the test
report will also indicate a Pass/Fail condition for each test parameter (i.e contact
time, stroke, velocity, etc.).
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.