Danfoss LonWorks Option Card, Instruction Manual

Page: 23 / 44

22
MG.60.N1.22 - VLT is a registered Danfoss trademark
VLT
®
5000 / VLT
®
6000 HVAC / VLT
®
8000 AQUA
System
Performance
• Up to 64 FTT-10 transceivers, or 128
LPT-10 transceivers, are allowed per
network segment.
• Both types of transceivers may be
used on a given segment, provided
that the following constraint is met:
(2 x number of FTT-10 transceivers) +
(number of LPT-10 transceivers)
≤
128.
System
Specifications
Free topology system specifications and
transmission specifications are described
below. Both specifications should be met to
ensure proper operation.
The transmission specification depends on
such factors as resistance, mutual
capacitance and the velocity of propagation.
The system designer may choose from a
variety of cables, depending on cost,
availability, and desired performance.
Performance may vary with cable type.
Contact Echelon for cable types and the
characterization of system performance.
Note that the following specifications ar Note that the following specifications ar
Note that the following specifications ar Note that the following specifications ar Note that the following specifications are for one
e for one
e for one e for one e for one
network segment. Multiple segments may be network segment. Multiple segments may be network segment. Multiple segments may be network segment. Multiple segments may be network segment. Multiple segments may be
combined using r
combined using r combined using r combined using r combined using repeaters to incr epeaters to incr epeaters to incr epeaters to incr epeaters to increase the ease the ease the ease the ease the
number of nodes and distance. number of nodes and distance. number of nodes and distance. number of nodes and distance. number of nodes and distance.
Transmission
Specifications Free Topology nodes run at 78 kbps
transmission speeds.
Doubly-
Terminated
Bus
Topology
Specifications
Free
Topology
Specifications
• The average temperature of the wire
must not exceed 55° C (131° F),
although individual segments of wire
may be as hot as 85° C (185° F).
Danfoss recommends the use of shielded LonWorks
communication cable for instance Belden 8719. See
also section 12
Plug in terminal Connector .
Cable
Specifications
Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for Maximum bus length for
segments with segments with segments with segments with segments with segments with both FTT segments with both FTT segments with both FTT segments with both FTT segments with both FTT-10 -10 -10 -10 -10
FTT FTT FTT FTT FTT-10 transceivers only -10 transceivers only -10 transceivers only -10 transceivers only -10 transceivers only and LPT and LPT and LPT and LPT and LPT-10 transceivers -10 transceivers -10 transceivers -10 transceivers -10 transceivers
Belden 85102 2700 m / 8858 ft 2200 m / 7217 ft
Belden 8471 2700 m/ 8858 ft 2200 m / 7217 ft
Level IV, 22AWG 1400 m / 4593 ft 1150 m / 3772 ft
JY (St) Y 2x2x0.8 900 m / 2952 ft 750 m / 2460 ft
Maximum Maximum
Maximum Maximum Maximum
Maximum Maximum
Maximum Maximum Maximum
node-to-node distance node-to-node distance node-to-node distance node-to-node distance node-to-node distance total wir total wir total wir total wir total wire length e length e length e length e length
Belden 85102 500 m / 1640 ft 500 m / 1640 ft
Belden 8471 400 m / 1312 ft 500 m / 1640 ft
Level IV, 22AWG 400 m / 1312 ft 500 m / 1640 ft
JY (St) Y 2x2x0.8 320 m / 1050 ft 500 m / 1640 ft