Startco Engineering Ltd.
Page 3
FPU-16 Feeder Protection Unit
Rev. 1
Pub. FPU-16-M, November, 1997
Downloaded from the Internet, see Disclaimer.
2.
FRONT-PANEL ANNUNCIATION, INDICATION, AND PROGRAMMING
2.1
GENERAL (See Figure 1)
FPU-16 modes are listed on the front panel. Modes 0 to 4 are used to enter trip-
and-alarm set points and to annunciate trips and alarms. Mode 5 is used to
select options. Modes 6, 7, and 8 are used to enter CT-primary ratings and
rated current. Modes 9 to F are used to display metered values and
values-at-trip.
2.2
LIQUID-CRYSTAL DISPLAY
The left digit of the four-digit liquid-crystal display uses a hexadecimal format
(0 to F) to indicate the mode displayed. The remaining digits (designated from
left to right as value digits 1, 2, and 3) display set-point values, meter readings,
and trip-and-alarm codes.
For value digits greater than 999, the last value digit is replaced by E to indicate
an extended range. To obtain the actual value, multiply the reading by 100. For
example, 30E is read as 3000.
2.3
KEYPAD
Four keypad switches provide the operator interface to the FPU-16.
Tactile-feedback switches are used to provide positive indication that switch
contact has been made:
RAMP — This switch is used to adjust values in Modes 0 to 8. Under normal
operation this switch is inoperative. To make the RAMP switch
operative, the program-change lockout must be defeated by
connecting FPU-16 terminals 20 and 21. To change a set point,
ENTER must be pressed within three seconds after RAMP is
released. If ENTER is not pressed within three seconds, the display
will return to its pre-adjusted value. One arrow up and two arrows
down indicate that the RAMP switch is bidirectional. To ramp up:
press and hold. To reverse: release, press again within one second
and hold.
MODE — This switch is used to select the mode displayed. Bidirectional
operation is the same as for RAMP.
RESET— This switch is used to reset trips and alarms and it is used with
ENTER to reset latched alarms in modes 0 to 4, to do an emergency
thermal reset in Mode d, and to reset the operation counter in Mode
F. It is also used to display current in percent of rated current (Modes
A, b, and C) and time-to-reset (Mode d).
