ISA T1000 PLUS - Page 59

DOC. MIE91093 Rev. 1.34 Page 59 of 145
. Program the starting frequency = FNOM, and a ROC greater
than MXROC, say ROC(33).
. Press ON+TIME and check for the trip time Tt. This delay is
the sum of T1 plus the time it has taken to reach F> (or F<
with negative ROC); so:
. Compute F> = (Tt – T1)*ROC + FNOM