Instruction manual
19
RCD Timed Test (continued):
Press the F1 key to select the 0 deg test and the F2 key to select the 180 deg test.
Use the F1/F2 keys to scroll through the multipliers X0.5 X1.0 X5.0 of the set current.
Maximum output current = 500mA. I.E if set test current were 100mA then 100 X 5.0 =500mA.
If set test current = 200mA then maximum out put 5 x 200mA =1A is out of range. Unit will not deliver this output current and
display on Screen “OUT of RANGE”.
Press F3 to start test. TnT+ will display results for 5 seconds after mains supply is tripped. If the power is not reset by the time
the unit loses power then the result will be displayed on power on.
Caution: Pressing F3 at this point will cause tripping if RCD fitted to circuit
TRIP CURRENT TEST. This testing principal is designed to trip RCD devices using a ramping up current value, to determine
the trip current of the RCD device. This useful test allows the user to determine circuit leakage load/pre-loading of RCD circuit.
This can assist in determining nuisance tripping issues or determining RCD performance if suspected faulty or inconsistent in
performance. The TnT+ has a nominal leakage current of 2mA, which should be added to the result of test. E,G. if RCD tripped
at 22mA + 2mA(TnT+)=24mA trip current.
RCD Trip Current. Press F2 to show the Trip current screen.
RCD Ramp Test:
Set RCD Type
Start Exit
Caution: Pressing F3 at the RCD ramp test screen will cause tripping if RCD fitted to circuit. F2 can be pressed to change the
RCD type at this point. See "Changing the RCD type" for details.
The Trip Current Test will ramp the mA current up until the RCD breaker trips. Current range 2.55 - 500mA. This test can go for
up to 10 sec to scroll through full range if RCD faulty or not fitted. Repeated testing in this mode will cause heating of TnT+.
Should over heating occur the internal temperature sensor will cause display to indicate “over temp allow to cool” This requires
the TnT+ device to be best left unplugged for several minutes allowing unit to cool.
TnT+ will display results for 5 seconds after mains supply is tripped. If the power is not reset by the time the unit loses p ower
then the result will be displayed on power on.
Caution: Continuous ramp current testing will cause unit to over heat