1 - FUNCTIONAL
- This card elaborates from the three phases voltage
image of the generator given by the "ALTERNATOR I/O" :
- A rectified, calibrated, filtered voltage Vm proportional
to the stator voltage of the generator. Vm could be affect-
ed by droop depending of adjustment.
- A voltage function of the generator frequency, a part of
which gives the reference set point named Vref.
- Vref is a constant above the underfrequency threshold
set point (signaled by LED) and decreases below this
threshold following a function depending of the position
of the strap CV1:
• In fixed V/Hz mode
• In adjustable kVolt / Hz (see curve below)
2 - ADJUSTMENTS
- P1 : Reactive droop adjust for parallel operation bet-
ween equivalent machine.
- P2 : Vm adjust for nominal voltage. (9Vdc at Un)
- P3 : Underfrequency threshold adjust (normally Fn -
5%) signaled by LED.
- P4 : Underfrequency slope adjust ( k ) in kVolt / Hz mode
(1
≤
k
≤
2)
- P5 : Voltage set point Vref for the nominal voltage
(10Vdc at Un and Fn)
3 - INPUTS / OUTPUTS
- 7a, 8a, 8c : Voltage inputs image of the generator (3 x
21Vac between each and the GND)
- 9a
: Current input image of the generator stator
current (1Vac pour In)
- 1a,1c
: +15Vdc regulated (Vcc)
- 32a,32c
: -15Vdc regulated (Vdd)
- 16a,17c
: Common ground (GND or 0V)
- 11c
: Voltage output image of the generator (Vm)
10Vdc at Un
- 11a
: Voltage set point output (Vref) 10Vdc at
Un and Fn
17
Sensing
card
AVR
Model R630
NT1950050/a-11/92 f:1/2
Mode Volt / Hz
Fn - 5%
Fn
Hz
Volt
Un
Mode k x Volt / Hz
AC / DC
AC / DC
AC / DC
Σ
Vm
Um
Vm
Wm
TI //
F -> kV
Voltage
set point
Threshold
U/F
k
Vref
Filter
Reactive
droop
8a
7a
8c
9a
32c,32a
1c,1a
16a,17c
-Vdd
+Vcc
0V
11c
11a
LED
MIMIC DIAGRAM OF SENSING CARD