F>> Threshold And Drop-Off; T2 Trip And Drop-Off Timing; F> Threshold - ISA T1000 PLUS User Manual

DOC. MIE91093 Rev. 1.34 Page 58 of 145
Save > Confirm at trip > ESC
Now, set the starting frequency to F>; then, set the first value
for ROC:
AUX VAC/VDC > Aux VAC control > Frequency > Adjust
F> (RET)
Adjust ROC
Press ON+TEST, and see if the relay trips. Two possibilities:
. Trip: don't save the result; reduce the ROC and repeat until
the relay does not trip. Now increase the ROC again: as the
relay trips, save test result.
. No trip: increase the ROC and repeat until the relay trips: as
it does, save test result.
With this test we also measure the timing T1.
Repeat now the test, with a starting frequency equal to F<,
and with the same value for ROC, but with negative sign.
1.7.4. F>> Threshold and drop-off
The test procedure is the same as the one for the frequency
relay; tmax must be set to 0.8*T1.

1.7.5. T2 trip and drop-off timing

The test procedure is the same as the one for the frequency
relay; tmax must be set to 0.8*T1.
1.7.6. F> threshold
This threshold cannot be checked directly (unless a starting
output is available; in this instance, the test is the same as for
the frequency relay).
If no starting output is available, proceed as follows.