Siemens SENTRON PAC3100 - Connecting to the RS 485 bus

Connection
6.5 Connecting to the RS 485 bus
SENTRON PAC3100
48 Manual, 07/2009, A5E02385159B-01
(5) Three-phase measuring, four conductors, unbalanced load, with voltage transformers,
with three current transformers
Connection type 3P3W
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* Fuses must be provided by the customer.
** Connection of supply voltage
Figure 6-10 Connection type 3P3W, with voltage transformer, with three current transformers
See also
Measuring inputs (Page 17)
6.5 Connecting to the RS 485 bus
Procedure
Connect the SENTRON PAC3100 to the RS 485 bus via the integral interface. Please pay
attention here to the general topology of the two-wire line.
1. Connect the RS 485 cables to the screw terminals of the terminal block.
2. Connect the cable shield at one end with protective ground PE.
3. Connect the signal Common with protective ground.
4. Ensure a bus terminating resistance is set at the first and last communication node.