ABB SPCU1D50 Automatic voltage regulating module
ABB SPCU1D50 Automatic voltage regulating module
Indicators for the measured voltage Um,
phase currents Im and voltage difference Ud
Indicator for reference voltage Us
Indicator for bandwidth DUs
Indicator for time delay T1
Indicator for time delay T2
Indicator for overcurrent blocking I>/In
Indicator for undervoltage blocking U
Indicator for overvoltage detection U>/Un
Indicator for compensating parameter Ur
Indicator for compensating parameter Ux
Indicator for parallel operation
Indicator for manual operation
Device symbol
Indicator of the self-supervision
system
Digital display
Display step push-button/
Reset push-button
Program push-button
AUT/MAN push-button
Parallel operation push-button
Operation indicator
Type designation of the
regulator module
The voltage regulating module SPCU 1D50
compares the measured secondary voltage Um
of the transformer to the control voltage Up.
The control voltage Up is composed of the setting
value Us, the line-drop compensation value
Uz, the circulating current compensation value
Uci and the reduce set voltage value Ursv, i.e. Up
= Us ± Uz ± Uci - Ursv.
The parameter DUs denotes the hysteresis,
which is active around Up, within which no
regulation takes place. If, for instance, Up = 100 V
and DUs = 1.5%, the module does not generate
a raise or lower command, when the measured
voltage is in the range Um = 98.5… 101.5 V. If
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 Um is outside
the DUh limits. The factory setting of DUh is
90% of DUs. If Um does not rise or fall within
the limits of DUh during the delay time, the
output signal is activated. Should, however, the
voltage Um rise or fall within the DUh limits
during the delay time, the delay counter is reset
and the module does not provide a control signal.
After the first control signal from the regulating
module, the voltage Um may still be outside
the limits of DUs. Then the second adjustable
delay time T2 starts. The setting of this delay is
normally shorter than T1. T1 and T2 can both
be given either a fixed value or a value depending
on the difference between Um and Up. This
deviation Um - Up, expressed as Ud, can be read
on the display of the module. When the delay
time depends on the deviation, it is inversely
proportional to the Ud/DUs ratio and thus also
depending on the set value of DUs.
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