Function Of Control Inputs; Front Panel - ABB SPAU 341 C User Manual

Function of
control inputs

Front panel

Tap-changer operating input (TCO)
The tap-changer operating input is used to de-
clare that a raise or lower command is executed.
I >, U< internal blocking inputs
These inputs are activated by the automatic con-
trol module SPCU 1D50 in an overcurrent or
undervoltage situation. Manual control is
blocked by an overcurrent situation. In an und-
ervoltage situtation, however, manual control
is still enabled. A LED indicator is provided for
each blocking.
POS
I >
U
<
U >
BLOCK
TCO
Fig 1. Front panel of the manual voltage regulating module SPCN 1D56
Simplified device symbol
Self-supervision alarm indicator
IRF
Position indication LED
Display for setting values, position indication
and measured values
RESET
STEP
Reset and display step push-button
LED indicators for blockings, raise/lower
control and tap-changer operation
PROGRAM
Program push-button
Raise push-button
Lower push-button
Manual control indication LED
MAN
Type designation of the module
SPCN 1D56
External blocking input
If the unit is externally blocked by the control
input, the corresponding blocking LED is lit
and any tap-changer control is prevented.
U > , overvoltage detection input
This input is activated by the module SPCU
1D50 in an overvoltage situation. During such
a condition, an indicating LED is lit, but manual
tap-changer control is still possible.
3