Subject to modifications and errors
Page 61 of 71
2019-06-26 edition
3.8
Loss Of Mains detection
3.8.1
Loss Of Mains detection via voltage measurement
In this procedure, a stand-alone grid is detected with the help of 3-phase voltage monitoring.
3.8.2
Loss Of Mains detection via RoCoF
In this procedure, a stand-alone grid is detected with the help of rate-of-change of frequency. This
measurement is based on frequency measurements and triggers in the event of lasting frequency changes
over multiple periods. The df/dt limit value is given and set in Hz/s.
3.8.3
Loss Of Mains detection via vector shift
In this procedure, a phase or vector shift is detected through time measurements of the half-waves and the
comparison with previous measurements. A vector shift can occur during a sudden load change. The
threshold value is given and set in degrees.
3.9
Test function
The test function can be activated in two different ways:
•
Pressing the ESC key in any window of menu level 1
•
Pressing the ENT key in screen 1.050
Both output relays A and B are switched off at activation of the test function and the turn-on time begins to
run.
As with every turn-off, the turn-off time is determined. The last turn-off time can be read on screen 1.40
(Toff).
3.10
Digital inputs
Digital inputs 1 and 2 serve as feedback contacts of both isolating contactors A and B. They are driven via
the auxiliary contact of the isolation contactor. Here, the auxiliary contact can be connected as normally
opened or normally closed and the digital inputs configured accordingly in the device.
Digital input 3 serves for the remote shutdown.
Both digital inputs 4 and 5 are used for parameter switching for Italian standard IEC 0-21.
3.11
Output contacts
Both output relays R1 and R2 control the isolation contactors/section switch.
Output relay R3 switches on in case of error (if configured accordingly).
3.12
Error
Current errors are displayed in level "1.060 Error," the display of the error memory is located in level 2. The
2 error types below are differentiated.