Vanguard CT-7000 - Manual (Page 9)

CT-7000 Operating Instructions
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The CT-7000 can also store up to 100 breaker timing test records and 99 breaker test-plans
into the FLASH EEPROM. Stored timing records can be recalled, printed or transferred to a
personal computer. Using the breaker test plan with a timing test, the users do not have to set the
velocity calculating points. The test report will also print “PASS” and “FAIL” results.
2.1 Contact Timing Channels
A breaker's interruption of contacts is timed with the dry-contact input channels. Each channel
can detect the main contacts and the insertion resistor contact times in milliseconds and cycles.
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.
2.2 Analog Voltage Monitoring Channel
One analog voltage, input channel, “V1” is dedicated to monitoring the breaker's DC power
supply or coil voltages from 0 to 255 Vdc or peak Vac.
NOTE
Input voltage ranges from 0 to 300 Vdc or peak Vac. Reading ranges from 0 to 255 Vdc.
2.3 Digital Voltage Monitoring Channel
One digital voltage, input channel, “V2” monitors the status voltage as “ON” or “OFF.” Voltages
from 30 to 255 Vdc is considered as “ON” status. Voltages less than 30 Vdc is considered as
“OFF” status.
2.4 Trip/Close Current Monitoring
A built-in, hall-effect, current sensor records the trip and close coil current levels and duration.
The coil current waveform can be graphically plotted onto a printout. The current reading is also
printed in the tabulated report.
2.5 Travel Transducer Input Channels
Each CT-7000 has three digital transducer, input channels. The CT-7000 will interface with a
linear, a rotary and other special transducers developed by Vanguard Instruments Company.
Please refer to Appendix I for more details.
2.6 Breaker Initiate Capability
A built-in, solid-state, initiate device allows the user to operate a breaker from the CT-7000.
Operational modes include: Open, Close, Open-Close, Close-Open and Open-Close-Open. The
multiple operations of: Open-Close, Close-Open and Open-Close-Open can be initiated with a
programmable delay time or by sensing the breaker's contact state.
The solid-state switching implemented in the initiate circuitry allows the CT-7000 to switch a
breaker's AC or DC control circuit. Two 5 Ampere, fast-blow fuses protect each trip and close
circuits. An interlock, “ARM” switch also protects the initiate circuit.
2.7 Built-in Thermal Printer
The breaker's contact analysis results can be outputted in both tabular and graphical formats
by a built-in, 4.5 inch wide, thermal printer. Refer to paragraph 7.4 for ordering thermal paper.
2.8 Computer Interface Capabilities
A built-in, RS-232C port permits the CT-7000 to be interfaced with an IBM-compatible