ABB SYN 5201 Operating Instructions Manual page 95

Operating Instructions
In this status, the phase-angle difference  must be 0 DEG. Otherwise, either the
measuring cables are incorrectly connected (in terms of polarity) or there is a phase shift
which must be compensated.
The synchronizing instruments (double voltmeter, double frequency meter and
synchroscope) if present, must be checked. The synchronoscope must stand at "twelve
o'clock"!
If this is not the case, the measuring circuits must be checked.
If the synchronoscope stands at "six o'clock", one voltage has been incorrectly
Note
connected. In other positions, either measuring is being carried out on incorrect phases
or a phase shift caused by the connection group of a step-up transformer has not been
compensated.
The circuit breaker should be opened again (or brought into test position) and the
paralleling circuit interrupted.
If it is not possible to test the phase sequence as described above, it is still essential to
Caution
test the measuring circuits. For example, the phase positions can be tested using high
voltage measuring sensors.
8.3 Work carried out while the machine is running
8.3.1 Adjusting the matchers to the plant
While the machine is running, the voltage and speed matchers must be adapted to the
plant. Normally, the test functions TEST U-Match and TEST f-Match can be used for this
purpose. The procedure is described in the corresponding section on parameter
settings.
In every case, the polarity of Higher and Lower commands has to be checked first.
Caution
Before carrying out a test function or before a function check, you should be prepared to
be able to stop the test function or the synchronization process prematurely if
necessary.
A number of special cases require a matcher with fixed pulse times and variable pause
intervals. In such cases, the parameters INVERSE U and INVERSE f must be set to ON.
The test function cannot then be used. Procedure for correct setting: see section 4.2.5
Switchover to variable intervals for INVERSE U or section 4.2.6 for INVERSE f.
Once setting work has been completed, SYNCHROTACT 5 can be set to ready status:
&
When the Start signal is given, the SYNCHROTACT 5 goes into operating mode. If error
messages occur, they must be eliminated according to the fault list (see section on
Faults).
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ABB Switzerland Ltd
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Document No Art Part
3BHS109762 E01
SYN 5201/SYN 5202
Language Revision page
en D 95