UNI-T UT593 - Automatic RCD Sequence Test

UT593/595 OPERATING MANUAL UT593/595 OPERATING MANUAL
3. You must ensure that neutral wire end of the power socket is reliably connected; in case poor
connection or no connection of the neutral wire end of the power socket, L-N and N-PE symbols
at the lower-left corner of LCD blink at the same time.
4. In measuring loop circuit impedance\fault expected short-circuit current, ensure that live wire
phase and neutral wire phase are not reversed for the power socket; otherwise, L-PE, L-N and
N-PE symbols at the lower-left corner of LCD blinks at the same time.
5. This kind of measurement is conducted under high-voltage state; much attention shall be given
to personal safety.
XIII. AUTOMATIC RCD SEQUENCE TEST (SEE FIG. 7)
Make the rotary switch point to AUTO item in RCD, according to Fig. 7, insert special red, green
and black lines with power plugs into the red, green and black input ends on the side of the
instrument; connect plugs into power frequency civil 220V socket; press TEST key to start
Automatic RCD sequence test.
Instructions: Automatic RCD testing is to complete measurement of 6 items of RCD tripping time
in turn by pressing the key for one time. For one time of test, 6 items of RCD measurement must be
completed at a time and the next test can be conducted. After test, the data are stored in the
instrument; you can press F3 to read the data of the whole test process. The sequence for 6 items
of RCD tests is as below:
1. 1/2*I n/0
2. 1/2*I n/180
3. 1*I n/0
4. 1*I n/180
5. 5*I n/0
6. 5*I n/180
Selection and operation of function keys F1-F4 is shown below:
F1 F2
F3
F4
Backlight
AC/DC/time RCL
I n
Instructions on key operation:
1. Press and hold F1 for about 2 seconds to open and close the backlight;
2. Press F2 for switching between RCD test type and count-down measuring mode; RCD test type:
optional full-wave and half-wave measuring modes; count-down measuring mode: in this mode,
press TEST key; in default, count-down from 30s to 0s to start RCD test.
3. Press F3 to show data stored after completion of test.
4. Press F4 to start RCD test current selection function.
Notice:
1. You must ensure normal supply of power frequency civil 220V in the power socket; in case of
abnormal power supply or no power, L-PE and L-N symbols at the lower-left corner of LCD blink
at the same time.
2. You must ensure that earth end of the power socket is soundly earthed; in case of poor
grounding or no grounding of the power socket, L-PE and N-PE symbols at the lower-left corner
of LCD blink at the same time.
3. You must ensure that neutral wire end of the power socket is reliably connected; in case poor
connection or no connection of the neutral wire end of the power socket, L-N and N-PE symbols
at the lower-left corner of LCD blink at the same time.
4. In measuring loop circuit impedance\fault expected short-circuit current, ensure that live wire
phase and neutral wire phase are not reversed for the power socket; otherwise, L-PE, L-N and
N-PE symbols at the lower-left corner of LCD blinks at the same time.