Engineering Instructions; First Channel - ABB SYN 5201 Operating Instructions Manual

Operating Instructions
5

Engineering instructions

5.1 General advice
5.1.1 Cable connections
Cables or wires with cross sections of 0.4 mm
connection terminals. It is recommended that 1 mm
and power supply connections; at least 1,5 mm
Connection of more than one cable to a terminal is not permitted.
The casing must be connected with the earth potential via the connection provided for
this purpose.
In order to prevent polarity errors, marked cables should be used for all voltage
transformers (measuring circuits).
It is urgently advised not to switch off the unit by interrupting the power supply, since
Caution
otherwise the monitoring of the paralleling contacts is no longer guaranteed. In the
event of a possible contact fault, incorrect paralleling could occur the next time
synchronization is selected.
5.1.2 Recommended measures for long distances
For distances >50 m, the following measures are recommended:
 The cables for the actual value measurement should have a cross section  2.5 mm
and should be twisted pair and shielded.
 The control circuits should be operated with a nominal voltage of  125 VDC in order
to prevent inductive interference.

All cables must be laid separately from high-voltage and high-current cables.
5.2 Connection of the measuring voltages
5.2.1 Three phase measuring
SYNCHROTACT 5
measuring signals, which is normally sufficient. If the synchronizing device is assigned
the task of detecting a loss of phase, the first channel of each system should measure
the voltage L1-L2, for example, and the second channel L3-L1. The detection of loss of
phase does not function if one of the phases is earthed instead of the star point.
Caution
Where the Dead Bus function is used, in particular, it should be noted that an
undetected loss of phase can simulate a dead bus situation. In such a case, the active
release signal for Dead Bus could trigger a synchronization error .
abb
ABB Switzerland Ltd
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synchronizing devices
Document No Art Part
3BHS109762 E01
SYN 5201/SYN 5202
2 2
to 2.5 mm can be connected to all the
2
should be used for control circuits
2
should be used for measuring circuits.
basically operate
Language
en
2
with single-phase
Revision page
D 67