MEWOI MEWOI1500D, Руководство пользователя

Страница: 24 / 32

-20-
6. Detection on phase sequence
It is available to detect LV three-phase sequence, by operating the
three-channel LV current clamp of the tester, which is a
non-contact measurement for a safe operation under a as follow:
dynamic display. Vise each corresponding wire on three phases
respectively with the three-channel LV current clamp, CT1 for R,
CT2 for S, CT3 for T, the phase sequence is positive if the R-phase
angle is 120 ° ± 25 ° more than the S-phase, and the S-phase
angle is 120 ° ± 25 ° more than the T-phase, otherwise it is
negative. The cursor rotates clockwise on LCD under the positive
phase sequence, and rotates counterclockwise under negative
phase sequence, as shown in the figure:
7. Alarm launch
Press the Right arrow key to enable or disable the alarm function
under the error test mode, the tester can sound a beep if the
function is enabled, and displays a small dot on the upper right
corner of LCD,
otherwise, the small dot isn’t shown when the alarm
function is disenabled.
The principal machine can
sound an alarm of “beep - beep – beep”
under the alarm enable state during the testing process of error if
the measured CT ratio error exceeds the preset error,