Vanguard CT-8000 - Manual (Page 42)

CT-8000 USER’S MANUAL REV 2
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3.2.9. Configuring the Transducer Encoder Filter Setting
In a typical 1-second timing record, the CT-8000 records 20,000 data points for each of the
contact channels, digital transducer channels, voltage input channels, CT channel, DCR channel,
resistor transducer channel, and initiate current channel. In most circuit breaker timing
applications, the breaker activities end after 200 milliseconds. A common problem found in the
field is that after the breaker activities have ended, the CT-8000 may record erroneous data on
the transducer channels due to vibration. The erroneous data may be due to the transducer not
being secured properly to the mounting plate or due to a poor linkage problem between the
transducer and the circuit breaker mechanism.
To address this problem, the CT-8000’s transducer encoder filter setting can be used to stop
recording the transducer channel data after a specific time. This feature can filter out the
unwanted motion picked up by the transducer after the breaker activities have ended. The CT-
8000’s default filter value is set to “No Filter” when the unit is powered on. Use the steps below
to change the transducer encoder filter setting:
a. Start from the “START-UP” menu:
Press the [4] key (DIAGNOSTICS).
b. The following screen will be displayed:
Press the
[4]
key (NEXT PAGE).
c. The following screen will be displayed:
Press the [2] key (ENCODER FILTER).
d. The following screen will be displayed:
ENTER FILTER TIME
(010 – 999)
1. PRINT DATA
2. ENCODER FILTER
3. CONTACT FILTER
1. SLOW CLOSE TEST
2. CHECK HOOKUP
3. TEST TRANSDUCER
4. NEXT PAGE
1. RUN TEST 03/10/10
2. GET RSLT 09:04:05
3. SETUP
4. DIAGNOSTICS