Doc. SIE10169 Rev. 13 Page 10 of 32
When used with position transducers, the software allows the displaying of: positions, strokes,
speed (datum point). These measurements are defined by the position of the cursors. In this
instance, it is possible to input the transducer stroke, and to set the unit of measurement as
millimetres, degrees or inches.
When the transducer movement is 50% of the total transducer length, the position error is 1% of the
reading. The error is inversely proportional to the percentage of the transducer movement. When
datum points are 25% of the total transducer length, and the corresponding time is 10 ms, the speed
accuracy is 3%. The error is inversely proportional to the percentage of the transducer movement
and to the movement time.
. When used as analog inputs, the most important use is the monitoring of the secondary current of
an energized CB, to perform the first trip test, that is, the measurement of the Open delay while the
CB is in service. This test is very important to detect the delay caused by the friction, which sticks
the CB that has operated a long time without opening.
. Connection: three via three multi-pole connectors; the fourth one via a two-way shielded
connector.
. On the same connectors is available a polarizing voltage to supply linear position transducers.
. Voltage value: + 5 V; maximum output current 30 mA; minimum transducer resistance 170 Ohm.
The output has the same reference as the three low voltage analog inputs.
2.5.4 Digital transducers
The digital transducer input allows monitoring up to three digital transducers at the meantime.
. Maximum input frequency: 50 kHz;
. Interface: RS422;
. Accepted transducers: up to 5000 impulses per turn.
. Connection: by the same three multi-pole connectors used for the analog inputs.
2.6
T
IME MEASUREMENT TRIGGERS
The following time measurement trigger options are user selectable:
. Internal: the time measurement starts as the first Open or Close coil command is issued by the
driving circuit. Timing accuracy: 50 µs.
. Coil current: the time measurement starts as soon as the first Open or Close coil current exceeds
the selected percentage, from 1% to 30%, of the selected current range.
. Auxiliary input: the time measurement starts when the selected auxiliary input turns ON or
changes its state. The trigger can be performed also on a logical combination of auxiliary inputs.
. Analog input: the time measurement starts when the analog input level crosses (greater than, lower
than) the selected threshold.
. External trigger. The test set features a Trigger Out output and a Trigger In input, that allow
synchronizing up to 4 CBA2000’s. In this mode, one CBA2000 acts as the Master unit; its Trigger
Out output will be connected to all other units, selected as Slave. As the Master starts the test, all
other Slave units will measure the timing on Main, auxiliary and analog inputs. Maximum timing
error: 100 us. This feature allows to test circuit breakers with more than two chambers per phase, or
to survey more than four auxiliary inputs, or to survey more than one analog input at a time.
2.7
P
ROGRAMMABLE SEQUENCES
Shop for Power Metering products online at:
1.877.766.5412
www.
PowerMeterStore
.ca
