Service Settings For Transceiver 21-216; Earthing - Hitachi 670 Series Application Manual

1MRK505382-UEN Rev. K
IEC10000062 V1 EN-US
Figure 75:
5.5.5.2 Service settings for transceiver 21–216
IEC07000256 V1 EN-US
Figure 76:
Only one setting is required for transceiver 21–216. It has to be set to external clock. Rotary switch
on the front panel pointing to position 0 indicates that external clock is selected. If back-to-back
testing is to be performed, one transceiver 21-216 has to be set as master by setting the rotary
switch to position 2 (overrides settings of jumpers 8 and 9). Clock synchronization configuration using
the rotary switch can be done on the fly.
5.5.6

Earthing

The recommended earthing method is direct earthing. With earth loop problems, soft earth method
can be beneficial (see Figures
Communication set-up, 670/650 series
Application Guide
IED set as a slave
Transceiver 21–216
77 and 78).
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Section 5
Communication set-up
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77