Startco FPU-16 - Mode 5 - Options; Autoreset; Alarm Latch; I 2 T IMMEDIATE RESET

Startco Engineering Ltd. Page 12
FPU-16 Feeder Protection Unit Rev. 0
Pub. FPU-16-M, November, 1997 Downloaded from the Internet, see Disclaimer.
3.7 MODE 5 — OPTIONS (See Tables 2 & 3)
This mode is used to select special program options. Any combination in Tables
2 and 3 can be selected by entering the appropriate hexadecimal numbers in
Mode 5 in the same way that trip-and-alarm set points are entered in Modes 0 to
4.
Default Values:
Table 2....................................... 5000
Table 3....................................... 5000
3.7.1 AUTORESET
When autoreset is ON, a Mode-0 trip will automatically reset when I
2
t decreases
to 30%. See Section 3.2. Autoreset will not occur if I
2
t IMMEDIATE RESET is
selected. If autoreset is required, disable I
2
t IMMEDIATE RESET.
Default.................................................. OFF
3.7.2 ALARM LATCH
When the alarm latch is ON, all alarms that occur in Modes 0 to 4 will latch and
must be individually reset. To reset a latched alarm, use MODE to select the
alarm and press ENTER and RESET simultaneously.
Default.................................................. OFF
3.7.3 I
2
t IMMEDIATE RESET
When I
2
t IMMEDIATE RESET is ON, I
2
t will be cleared when a Mode-0 trip
occurs. This will allow an immediate Mode-0 reset when RESET is pressed.
When OFF, Mode-0 reset is not allowed until I
2
t has decreased to 30%.
3.7.4 SPARE
Not used.
3.7.5 EARTH-FAULT TRIP TIME
Four earth-fault trip times (3, 6, 12, or 24 cycles) are available. See Section 3.6.
Default.................................................. 3 cycles