The function can also be configured to handle only two-position switches (earthing
switch or disconnector).
9.2.4 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "on" and "off".
The switch type is determined depending on the connected inputs in Application
Configuration.
• If inputs DCPOSOPEN, DCPOSCLOSE, ESPOSOPEN and ESPOSCLOSE are connected,
the switch type is three-position switch.
• When only inputs DCPOSOPEN and DCPOSCLOSE are connected, the switch type is
disconnector.
• When only inputs ESPOSOPEN and ESPOSCLOSE are connected, the switch type is
earthing switch.
Any other connection leads to a configuration error.
The motor control application of the three-position switch can be selected with
parameter setting
Control mode
. If "With RIO600 SCM" is selected, the motor
control is handled externally by the RIO600 SCM module; the protection relay only
supervises the switch position and interlocking but provides commands to RIO600.
If "Direct control" is selected, the motor control is handled by the protection relay’s
H-bridge and no external RIO600 SCM device is needed.
9.2.4.1 Position indication and validity check
Depending on the switch type connection, a three-position switch, disconnector or
earthing switch can be configured.
Be aware of the physical switch type and corresponding connections in
Application Configuration, both for P3SXSWI and in RIO600 SCM, if used.
A wrong connection according to the physical switch type can cause
misleading position indication.
In certain three-position switches an additional reed contact is available to indicate
safe earthing. The contact is TRUE only when the earthing switch is in closed
position. The reed contact is given a short time window to confirm closed earthing
switch position, in case of vibrations. If the earthing switch has closed but the reed
contact does not close within the time window, faulty position is reported.
Table 1474: Reed contact detection
Control mode Reed contact detection
Direct control The availability of the reed contact needs to be set through
the
Reed contact
setting by setting it as "Available". The reed
contact signal is connected at input REED.
With RIO600 SCM Reed detection is handled externally by the module. The in-
put ESPOSCLOSE is not indicated TRUE by RIO600 if reed
contact closing is not detected. Therefore, unsecure earthing
is reported to input REED_ERR so that P3SXSWI can indicate
faulty position in this control mode.
1MRS759142 F Control functions
REX640
Technical Manual
1521
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