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Operating Instructions
SYN 5201/SYN 5202
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abb
ABB Switzerland Ltd
3BHS109762 E01
en D 108
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9.2.4 Troubleshooting
unsuccessful
The following advice can be of assistance in difficult cases. In order to interpret a fault
more accurately, it is important to make a distinction as to which phase the synchronizer
is currently in:
1. System testing
2. Commissioning
3. Operation
System testing
Is the wiring correct?
Is the sequence of control commands correct? (e.g. parameter set selection first,
then Start command)
Critical examination for errors in project planning (e.g. selecting TEST mode by
means of the configurable inputs puts the device into BLOCKED status. If this is
followed by a Start command, commands will be issued in blocked status!)
Does the test method correspond to reality?
Commissioning
Faults which occur during commissioning often have their cause in incorrect handling,
incorrect settings, inadmissible external conditions or connection errors at the interface
between plant and synchronizing system.
If the synchronizing process takes a long time:
Voltage or frequency matchers are not functioning correctly: optimise adjusting
commands using test function or empirically (see section on Commissioning).
Theoretically, only one pulse is required in order to achieve the tolerance band.
The simplest way to check the synchronization is using the synchronoscope. If the plant
does not feature one of these, the synchronoscope of the PC tool
SynView
can be
used. However, this display depends on the SYNCHROTACT 5, i.e. measuring errors
cannot be detected.
If it seems that the SYNCHROTACT should really have acted by now, you should check
which conditions could not be fulfilled. This can be seen simply from the LEDs
U <
Umax, s < smax and
<
max. All three conditions must always be fulfilled
(LEDs lit), in order for a command to be issued. The second channel should also be
considered (SYN 5202): are its settings matched to those for channel 1?
Some governors do not operate in a very stable manner. The set tolerance band for the
slip can often not be achieved for a long time, or not at all. In this case the problem may
be remedied by increasing the smax settings. However, you should not go beyond the
usual values of 0.1 to 0.5 % without making sure that the machine can withstand this
(see section 4.2.3).