ABB REG670 - Page 465

tMin
tCutOff
tMax
i>IBase
t (s)
I (A)
-
÷
ø
ö
ç
è
æ
=
1
2
1
IBase
I
k
op
t
IEC12000009-1-en.vsd
IEC12000009 V1 EN
t_MinTripDelay
tCutOff
t_MaxTripDelay
IPickupIBase
t (s)
I (A)
1
2
IBase
I
TD1
tr
t
ANSI12000009-1-en.vsd
ANSI12000009 V1 EN
Figure 215: Operating characteristic for overload function
As shown in Figure 215 it is possible to define the maximum (tMax) and minimum
(tMin) operate time for the function regardless of the level of the measured current. In
1MRK502052-UEN B Section 8
Current protection
459
Technical manual