GESTRA NRS 1-41, Original Installation Instructions

Page: 16 / 36

16
Electrical Connection
Control cable
NRS, NRR, LRR, TRS, URB 1
To wire the equipment, screened multicore twistedpair control cable must be used for the bus line, e.
g. UNITRONIC
®
BUS CAN 2 x 2 x ... mm
2
or RE2YCYVfl 2 x 2 x ... mm
2
.
Control cable assemblies (2 x 2 x 0.32 mm² cable with plug and connector) of various lengths are
available as addon equipment.
NRG, LRG, EF, URZ, TRV, URB 2
The equipment is fitted with sensor plugin connectors (5 poles, Acoded). For connecting the bus
devices control cable assemblies (with plug and connector) of various lengths are available as addon
equipment.
Note that the recommended control cables are not UVresistant and must be protected by a
UVresistant plastic tube or cable duct if the equipment is installed outdoors (except for URB 2).
The baud rate (data transfer rate) dictates the cable length and size between the bus nodes. The total
power consumption must also be taken into consideration when selecting the conductor size. The total
power consumption is obtained from the number of bus nodes.
If the cable length between the steam boiler and the control cabinet exceeds 15 m, we recommend that
you fit a branching box that is resistant to electromagnetic interference (stock code 1501214) and use
a control cable with a larger conductor size for the distance to the control cabinet.
S 8 S 9 S 10 Baud rate Cable length
Number of pairs
and conductor size [mm
2
]
OFF ON OFF 250 kBit/s 125 m
2 x 2 x 0.32
Factory setting
ON ON OFF 125 kBit/s 250 m 2 x 2 x 0.5
OFF OFF ON 100 kBit/s 335 m 2 x 2 x 0.75
ON OFF ON 50 kBit/s 500 m
on request, depending on
bus configuration
OFF ON ON 20 kBit/s 1000 m
ON ON ON 10 kBit/s 1000 m
Set baud rate via code switch
9
. Make sure that all bus nodes feature the same settings.
UNITRONIC ® is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart.