Flowserve NRS1-40.1 - Manual (Page 13)

13
Wiring
Bus cable, cable length and size
Note that screened multi-core twisted-pair control cable is required as Bus line, e. g. UNITRONIC
®
BUS
CAN 2 x 2 x ...mm² or RE-2YCYV-fl 2x 2x ...mm².
The cable length dictates the baud rate (data transfer rate) between the bus nodes, and the total power
consumption of the sensor dictates the conductor size.
The baud rate is set via code switch Fig.4 (S8 to S10). Default factory setting of control unit NRS 1-40.1:
baud rate 250 kBit/s (cable length up to 125 m). For longer cable lengths reduce baud rate accordingly.
Make sure that all bus nodes feature the same settings.
Change baud rate
With lower terminal strip unplugged:
Set the baud rate via code switches
S8 to S10 as specified in the table in section Bus cable, cable length
and size by using a thin blade screwdriver.
Re-insert terminal strip
and fasten the fixing screws .
Wire terminal strip
Wire terminal strips in accordance with the wiring diagram.
Connect screens only to terminal 3.
The max. baud rates and cable lengths indicated above are based on empirical values ob-
tained by GESTRA. In certain cases it may be necessary to reduce the baud rate in order to
ensure trouble-free operation.
S 8 S 9 S 10 Baud rate Cable length
Number of pairs
and conductor size [mm²]
OFF ON OFF 250 kBit/s 125 m 2 x2 x0.34
Factory setting
ON ON OFF 125 kBit/s 250 m 2 x2 x0.5
OFF OFF ON 100 kBit/s 335 m 2 x2 x0.75
ON OFF ON 50 kBit/s 500 m available on demand (depends
on bus configuration)
OFF ON ON 20 kBit/s 1000 m
ON ON ON 10 kBit/s 1000 m
D
D
B C
Note