1 - FUNCTIONAL
- This card, from Vm (machine voltage image), Vref
(voltage set point) and complementary informations
given in the following, elaborates the voltage command
of the power driver card, which is the field current set
point.
- Three operating modes are possible, depending of ex-
ternal informations :
• Solo operation or parallel operation between equiva-
lent machines (1 Fonction)
(this is the normal mode)
• Parallel operation with the mains with power factor
(COSØ) or KVAR regulation (2 Fonction)
(only if COSØ / KVAR card is fitted)
• Operation in voltage equalization mode between
machine and mains before coupling (3 Fonction)
(only if "MAINS I / O" CARD is fitted)
1F : Machine image Vmis compared with the sum of
Vref, Pext, etc voltages depending of used options and
the resultant voltage (error voltage ) feeds the PID.
2F : When cosØ cmd input is activated (+Vcc), the
machine voltage Vm is compared to the voltage given
from the cosØ/KVAR card and the result (error voltage)
feeds the PID.
3F : When U/U cmd input is activated (+Vcc), the ma-
chine voltage Vm is compared to the voltage given from
the "MAINS I / O" card and the result (error voltage)
feeds the PID.
A compensation external input, given for specific applica-
tions is added to the error voltage and the resultant
voltage is the real PID input. Each branch (P, I, D) of the
PID, independently adjustable from the others, set the
time constants of the AVR in regard to the generator.
The integrator branch can be short-circuited, for example
when starting-up.
These three outputs are added, limited to 10Vdc and
then give the field current set voltage of the "automatic
channel" which is the driver card input.
The minimum value of this signal can be limitated to
avoid total loss of excitation of the generator. In case of
parallel operation with the mains (cosØ/KVAR card), this
limitation is a function of the active power supply by the
generator, this information is given by the COSØ / KVAR
card.
A separate stage detect if the generator voltage is below
an adjustable value to unlock the normal field ceiling vol-
tage from 110% of nominal to 160% (adjustable).
2 - ADJUSTMENTS
- P1 : Ceiling unlocked voltage threshold adjust (nor-
mally 90% Un).
- P2 : Proportionnal branch gain adjust (large signal)
- P3 : Proportionnal branch gain adjust
- P4 : Integrative branch time constant adjust
- P5 : Derivative branch gain adjust
- P6 : Derivative branch time constant adjust
- P7 : Minimum field limitation adjust
- P8 : Minimum field limitation, active power correction
adjust
3 - INPUTS / OUTPUTS
- 11a : Voltage reference set point input. Vref
- 13c : Added signal to voltage reference set point input
(option)
- 22c : Added signal to voltage reference set point input
(external voltage option)
- 21a : Added signal to voltage reference set point input
(external potentiometer option)
- 13a : Added signal to voltage reference set point input
(differential droop option; with cosØ/KVAR card)
- 19a : Integrator short-circuit command input
- 10a : Mains image voltage input (3F) (with "MAINS I /
O" card only)
- 14c : CosØ error voltage input (2F) (with cosØ/KVAR
card)
- 25c : Voltage equalization command input (3F) (with
"MAINS I / O" card only)
-
24a : CosØ regulation command input (2F) (with
cosØ/KVAR card)
- 1a,1c
: +15Vdc regulated (Vcc)
- 32a,32c : -15Vdc regulated (Vdd)
- 16a,17c : Common electronic ground
- 14a
: Minimum field limitation, active power correc-
tion input
- 15c
: Field current voltage control output "AUTO"
channel
19
PID, LIMIT
card
AVR
Model R630
NT1950060/a-11/92 f:1/3
