Megger MFT1815 User Manual

8.11 Variable RCDs (not MFT1815)
1. To test an RCD with a variable trip current, select the
VAR
option on the secondary (right) range knob.
2. Press the
MODE button to select the symbol.
3. Use the UP and DOWN arrows on the right hand TEST and LOCK buttons to set the tripping current to match
that on the variable RCD.
The tripping current can be selected as below;
10 mA to 50 mA – 1 mA steps
50 mA to 500 mA – 5 mA steps
500 mA to 1000 mA – 10 mA steps
Save this current using the left hand Red LOCK button.
Test using the previous test options in 8.4 (see “8.4 1 x I RCD current rating (Tripping test on 30 mA RCD)” on
page 40).
8.12 AUTO RCD testing
The AUTO function of the RCD test options automatically performs the 1/2xI, 1xI, 2xl and 5xI in both 0° and 180°,
without touching the MFT. The operator can stand by the RCD and reset the device each time it trips.
Test sequence in AUTO mode:
RCD Type AC AC - S A A - S B
1/2 x I at 0°

Not available

Not available Not available
1 x I at 0°
 
1 x I at 180°
 
2 x I at 0°
 
2 x I at 180°
 
5 x I at 0°
 
5 x I at 180°
 
To test the RCD in AUTO mode
4. Select the AUTO range on the left range knob
5. Select the RCD Type as in “8.2 Selecting RCD type” on page 38.
6. Connect the Red (L1) and Green (L2) terminals of the MFT to the RCD as in 8.3 on page 39
7. Press the TEST button on the MFT. The test sequence as in the table above will be performed.
Each time the RCD trips, it should be reset. The MFT automatically detects the reset and continues testing until the
RCD stops tripping. The MFT will display “END”
8. Return to the MFT and press the mode
button to scroll through the test results in sequence.
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Residual Current Device (RCD) or Ground Fault Current Interrupt (GFCI) testing

Megger MFT1815 Specifications

General

Brand	Megger
Model	MFT1815
Category	Test Equipment
Language	English