Startco Engineering Ltd.
Page 15
FPU-16 Feeder Protection Unit
Rev. 1
Pub. FPU-16-M, November, 1997
Downloaded from the Internet, see Disclaimer.
3.7.6 SHORT-TIME TRIP-AND-ALARM TIME
Four short-time trip-and-alarm times (3, 6, 12, or 24 cycles) are available. See
Section 3.3.
Default .................................................. 3 cycles
3.7.7 ANALOG-OUTPUT PARAMETER
For units without RS-485 communication interface, the analog output parameter
is selectable as shown in Table 3. When CURRENT is selected, the maximum
of the three phase currents is used.
Current (Mode A, b, or C) ...................... 0 to 1.25 I
n
I
2
t (Mode d) ........................................... 0 to 100%
Earth Leakage (Mode E)........................ 0 to 1 x I
e
Default .................................................. Current
3.7.8 RELAY OPERATING MODE
Each output-relay driver can be independently operated in a fail-safe or non-fail-
safe mode. In the fail-safe mode, the output relays are energized when supply
voltage is on and the unit is not in a trip-or-alarm condition. The output relays
are de-energized if supply voltage is off or if a trip-or-alarm condition occurs.
FPU-16 labelling shows the relays de-energized. In the non-fail-safe mode, the
output relays are energized only during a trip-or-alarm condition.
Default Values:
Trip Relay ................................... Fail Safe
Alarm Relay ................................ Fail Safe
3.8
MODE 6 — EARTH-FAULT-CT-PRIMARY RATING (I
e
)
This mode is used to enter the earth-fault-CT-primary rating. All four digits are
displayed when the earth-fault-CT-primary rating is being adjusted. When the
new rating is entered, the display returns to the three-value-digit format and the
extended-range notation applies for values above 999 A. See Section 2.2.
The primary rating for the EFCT-1 and EFCT-2 is 5 A. If a 5-A- or 1-A-secondary
earth-fault CT is used, the primary rating of the earth-fault CT must be entered.
If the residual connection is used, enter the primary rating of the phase CT’s in
both Modes 6 and 7.
