Transc.
21-216
Protective earth
screw (or any
screw with a good
earth connection)
Make sure the boxes are
properly earthed with shortest
possible connections to, for
example, an earthed frame
< 10 m between earth points
For ”soft earth”
remove jumper P4
R = 100 kohm
C = 100 nF
Transceiver 21-216 and PCM should preferably use
the same auxiliary voltage supply (a 48 V battery)
Direct
earth
(default)
Outer shielding connected to
earth at both ends
Internal
electronics
Internal
electronics
directly earthed
IEC08000073-1-en.vsdx
PCM
IEC08000073 V1 EN-US
Figure 76: Earthing principles
P4
IEC10000207-1-en.vsdx
IEC10000207 V1 EN-US
Figure 77: Earth selector jumper
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
GUID-A1B07E54-B7A3-40E1-85A0-61AA17D03398 v1
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.
Section 5
1MRK 505 382-UEN E
Communication set-up
76
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
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