ABB RELION REX640 Technical Manual page 1592

Section 9
Control functions
1586
Type Statistics
Resistor Switch parallel resistor
control (auto)
Switch parallel resistor
(manual)
Other Motor running time
Coil manual tuning
PASANCR supports manual coil tuning when Controller mode setting is "Manual".
Manual control is achieved by activating RAISE_LOCAL and LOWER_LOCAL inputs
which activate the corresponding RAISE_OWN and LOWER_OWN outputs. The
manual mode and the corresponding inputs can be activated, for example, via HMI
application. Moreover, the manual control of the coil can be achieved via
communication by using the Coil Target Pos setting. Once the setting is committed,
the controller moves to the desired position. Also the activated operating limits can
restrict the coil movement. The MOT_ALARM output is activated during manual
control if the coil position is not changed due to activated RAISE_OWN and
LOWER_OWN commands. The ALARM output is activated when the movement of the
coil is in wrong direction or both end switches indicate simultaneously enabled
signaling.
Coil manual movement is possible only after calibration.
During the manual control mode the network resonance curve is not
updated automatically. The previous automatically detected
resonance curve is displayed on the HMI view.
It is possible to manually control the connection status of the fixed parallel coil with
Fix coil type setting by selecting "ON" or "OFF". The setting can be changed via the
settings menu or HMI application.
Resistor control
Zero-sequence currents in compensated networks are usually very low, making it
difficult to select the faulty line. To avoid sensitivity problems, the parallel resistor of
the ASC is often used to increase the zero-sequence current allowing a simple earth-
fault protection to locate the faulty line. PASANCR contains a functionality to switch
the resistor on and off automatically or on user input.
First, the resistor installation status is set with Parallel resistor setting. The available
options are "True" and "False". If the parallel resistor is installed in the system, the
value is selected with Resistor Nom value setting. Second, the nominal voltage level
of the power auxiliary winding is selected with Auxiliary Wnd V Nom setting.
The Resistor control setting is used to enable the automatic control sequence or to
connect or disconnect the resistor. The automatic control sequence is released if the
Description
Number of parallel resistor switch operations. For example, if
the resistor is initially off, then it is switched on and after a
defined delay, it is again switched off, this increases the
counter by two.
Number of manual switch operations for parallel resistor
Sum time of RAISE_OWN and LOWER_OWN outputs activated
1MRS759142 C
REX640
Technical Manual