Communication Structure For Laboratory Testing - ABB Relion 670 Series Application Manual

Section 5
Communication set-up
Internal
electronics
Direct
earth
(default)
For "soft earth"
remove jumper P4
R = 100 kohm
C = 100 nF
IEC08000073 V1 EN-US
Figure 76: Earthing principles
IEC10000207 V1 EN-US
Figure 77:
The strapping area/jumper P4 selects how internal signal earth and chassis earth are
referenced together. With a jumper between P4's terminals, signal earth and chassis earth are
directly connected. Without a jumper between P4's terminals, signal earth and chassis earth
are connected with a 100 kΩ resistor in parallel with a 100nF capacitor.
After jumper selection, reassembling is done in the reverse order to above. Do not forget to
reconnect protective earth cables.
5.5.7

Communication structure for laboratory testing

During laboratory testing, one transceiver 21-216 has to provide the timing. This is done by
removing the jumper on its S14 EXT CLK. Remember to restore the jumper after testing.
76
< 10 m between earth points
Outer shielding connected to
earth at both ends
Transc.
21-216
Make sure the boxes are
properly earthed with shortest
possible connections to, for
example, an earthed frame
Transceiver 21-216 and PCM should preferably use
the same auxiliary voltage supply (a 48 V battery)
Earth selector jumper
© Copyright 2017 ABB. All rights reserved
Internal
electronics
PCM
directly earthed
Protective earth
screw (or any
screw with a good
earth connection)
IEC08000073-1-en.vsdx
P4
IEC10000207-1-en.vsdx
GUID-A1B07E54-B7A3-40E1-85A0-61AA17D03398 v1
Communication set-up, 670/650 series
1MRK 505 382-UEN E
Application Guide