HAT700 SERIES ATS CONTROLLER USER MANUAL
HAT700 Series ATS Controller 2018-12-13 Version 1.5 Page 33 of 51
9.4 DEFINITE TIME DELAY AND INVERSE DEFINITE MINIMUM TIME SETTING
Definite Time：overcurrent delay is definite time delay. Different overcurrent value has corresponding
delay.
Inverse Definite Minimum Time(IDMT)：overcurrent delay decrease with the increase of overcurrent.
Different overcurrent value has corresponding delay.
IDMT formula:
T = t / ((IA/IT)-1)
2
T：Overcurrent delay (second)
t：Timing multiplier ratio
IA：Current max. load current（L1/L2/L3）
IT：Overcurrent setting value
Example：
t = 36
IA = 550A
IT =500A
Conclusion: T = 3600s(1hour)
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