TH2829X Series Operation Manual Chapter 7 Transformer Auto Scanning Test
2. Connect scan box and instrument correctly.
3. Enter self-check figure to perform scan self-check, as the figure below：
TH2829x785
7.18.2 Displayed information on screen
OP: Open, the relay is not closed when it is controlled.
ST: Short, the relay is closed when it is controlled.
OK: OK, the relay works normally.
DR: DR, the relay works abnormally.
The unfavorable condition of scan box circuit and relay is very complicated, so the
instrument cannot figure out the unfavorable condition of each relay completely,
and then user can solve the problems according to the hints and the rules.
1. ST doesn’t mean the relay is short certainly, because ST condition
can be tested without charge, then user can remove the relay and use
multimeter to test. The resistance of ST maybe several kilo ohm or even
mega ohm.
2. When one of SH, SL, ST displays as OP, if HcHp is displayed as OP,
then it maybe a miscarriage, so user has to change the relay on HcHp
terminal, and scan self-check again.
Press the key to start scan test
Press the key to stop scanning.
Quit when scanning stops.
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