Control Voltage U; Reduce Set Voltage; Second Settings - ABB SPAU 341 C User Manual

Operation
principle

Control voltage U

p

Reduce set voltage

Second settings

The voltage regulating module SPCU 1D50
compares the measured secondary voltage U
of the transformer to the control voltage U
The control voltage U is composed of the set-
p
ting value U , the line-drop compensation value
s
U , the circulating current compensation value
z
U and the reduce set voltage value U
ci
± U ± U
= U - U .
s z ci rsv
The parameter ∆U
denotes the hysteresis,
s
which is active around U
regulation takes place. If, for instance, U
and ∆U
= 1.5%, the module does not generate
s
a raise or lower command, when the measured
voltage is in the range U
m
the measured voltage is below 98.5 V or above
101.5 V, the adjustable delay time T1 starts. This
delay time is running as long as U
the ∆U limits. The factory setting of ∆U
h
90% of ∆U
. If U does not rise or fall within
s m
The voltage regulating module constantly regu-
lates the secondary voltage towards U
control expression has the following form:
± U ± U
U = U - U
p s z ci rsv
The reduce set voltage feature can be used for
load shedding or simple line drop compensa-
tion purposes. The set voltage is reduced by ac-
tivating the RSV 1/2 or RSV 1/1 binary input.
Activating the RSV 1/2 input reduces the set
voltage by half the setting value RSV and acti-
vating the RSV 1/1 input reduces the set volt-
Either main or second settings can be selected
as currently used settings. Switching between
main and second settings can be done in three
different ways:
1) Over the serial communication, using the
command V150.
2) Via the push-buttons on the front panel and
subregister 4 of register A. The setting 0 acti-
vates the main settings and the setting 1 acti-
vates the second settings.
the limits of ∆Uh during the delay time, the
output signal is activated. Should, however, the
m
. voltage U
p
during the delay time, the delay counter is reset
and the module does not provide a control sig-
nal.
, i.e. U
rsv p
After the first control signal from the regulat-
ing module, the voltage U
the limits of ∆U
, within which no delay time T2 starts. The setting of this delay is
p
= 100 V normally shorter than T1. T1 and T2 can both
p
be given either a fixed value or a value depend-
ing on the difference between U
= 98.5... 101.5 V. If deviation U
on the display of the module. When the delay
time depends on the deviation, it is inversely
is outside proportional to the U
m
depending on the set value of ∆U
is
h
U
. The U
p
U
U
age to the full extent of setting value RSV. If
both inputs are active, the RSV 1/1 input has
priority and the set voltage is reduced to the
full extent. The setting value RSV is selectable
in the range 0.00...9.00%. Software switch
SGF2/8 has to be set and SGF2/1 has to be
cleared if both inputs are used.
3) By setting the switch SGF1/6 into position
rise or fall within the ∆U
m
m
. Then the second adjustable
s
- U , expressed as U
m p
/∆U
d
= reference voltage
s
= line-drop compensation value
z
= circulating current compensation value
ci
= reduce set voltage value
rsv
1. Then the selection of main or second set-
tings depends on the regulator operation
mode. If single operation is used, main set-
tings are valid and if parallel operation is used,
second settings are valid. Setting the switch
SGF1/6 into position 1 deactivates param-
eter V150 and subregister 4 of register A.
Note! To become active, the switch must be
set into position 1 in both setting banks.
limits
h
may still be outside
and U . This
m p
, can be read
d
ratio and thus also
s
.
s
3