Trip And Drop-Off Timing - ISA T1000 PLUS User Manual

DOC. MIE91093 Rev. 1.34 Page 47 of 145
then, the standard measurement is restored. Confirm save
results pressing the multi-function knob, and proceed: the
display shows the corresponding single-phase power.
. From this voltage value, slowly reduce it, until the relay
resets: P2 drop-off is found. As the relay resets, pressing the
multi-function knob drop-off values can be saved.
Other points can be found the same way. For the sake of
accuracy, test at constant voltage down to 8 V, and at
constant current from 10 mA up.

1.5.5. Trip and drop-off timing

Now we can measure trip timing.
. Press ON and pre-adjust I = IN; V = VN;  = MTA: as the
relay trips, don't save test result; go OFF.
. Select ON+TIME: as the relay trips, test goes OFF; pressing
the multi-function knob tripping values can be saved. The
TRIP LED (43) turns on and parameters at trip are displayed
until ON or ON+TIME are selected. Confirm save results
pressing the multi-function knob.
Now we can measure the drop-off timing.
. First thing, select the NO (or NC) level for the relay reset
contact:
Timer start/stop > STOP > EXT > Clean (Voltage) > NC
(NO) ESC
. Then, select ON and then select OFF+TIME: as the relay
resets, pressing the multi-function knob drop-off values can
be saved. Confirm save results pressing the multi-function
knob, and proceed.