Vanguard CT-6500 S2 - Manual (Page 9)

CT-6500 Series 2 Operating Instructions
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2.0 CT-6500 Description
2.1 Contact Timing Channels
A breaker's interruption of contacts are timed with the dry-contact input channels. Each contact
channel can detect the main contacts and the insertion resistor contact times in milliseconds and
cycles.
The CT-6500 applies a test voltage of 35Vdc to each of the contact channels thus allowing an
analog to digital converter (A/D) to determine if a close, an open or an insertion resistor was the
state of the contact. The CT-6500 records into the memory 20,000 readings from the A/Ds and
the transducer position counters. The contact time, circuit breaker stroke and velocity is then
derived from the data that was stored in the memory.
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.
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 255Vdc or peak Vac.
NOTE
Maximum input voltage is 300Vdc or peak Vac. Recording voltage readings are from 0
to 255Vdc.
2.3 Digital Voltage Monitoring Channel
One digital voltage, input channel, “V2” monitors the status voltage as “ON” or “OFF.” Voltages
from 30 to 255Vdc are considered as “ON” status. Voltages less than 30Vdc are considered as
“OFF” status.
2.4 Trip/Close Current Monitoring
A built-in, hall-effect, current sensor measures the trip and close coil current levels and
duration. The coil current waveform can be graphically plotted onto a printout. The coil current
reading is also printed in the tabulated report. The CT-6500 initiate circuit is capable of carrying
up to 30 amperes. Maximum coil current reading is 20 amperes.
2.5 Travel Transducer Input Channels
Each CT-6500 has three digital transducer input channels. The CT-6500 uses up-down
counters to sense the breaker’s transducer reading. The CT-6500 travel transducer employs
optical encoders to send quadrature signals to the CT-6500’s counters. With the use of digital
transducers and counters, the need to set up or calibrate the transducers is eliminated.
The CT-6500 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 the circuit breaker from the CT-
6500. 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-6500 to switch a