Delta Controls DNT-T103 Installation Guide

Delta Controls
Notes:
1. Ensure you use the recommended balanced cable for the network and follow and follow the documented
procedures within
Delta Controls Wiring and Installation Guidelines for MS/TP or LINKnet networks.
2. Do
not use 4-wire multi-conductor cable for network and power, as it will not meet the balanced cable
requirements for the MS/TP or LINKnet networks. Use two separate cables: one for the network and the
other for power.
3. Do not terminate the network shield on the BACstats, but ensure shield conductivity is maintained along the
network from end-to-end with wire nuts as necessary.
4. If the same power source is used for more than one device, ensure that the transformer is properly sized for the
rated VA and that the same polarity is observed from device to device.
Power
The DNT-T103 requires a 24V AC Class 2 power supply. The VA requirements vary depending on the
output configuration as follows:
41 VA maximum (with internally powered triacs at full load)
3 VA (with triacs externally powered)
More than one device – not including DCUs or V2 products – may be connected to the same transformer, if
the transformer is properly sized (including line losses), and the polarity is observed between controllers (in
regards to 24~ and GND). The transformer must
ONLY be used to provide power to other MS/TP or
LINKnet devices and field devices powered through its outputs. Auxiliary field devices (i.e., 4-20 mA
devices) that don’t use ½ wave rectification must be powered separately.
For more information refer to the
Delta Controls Wiring and Installation Guidelines.
Network & Cabling Requirements
Adhere to the following network and cabling requirements to ensure network stability and reliable communications,
particularly at high speeds on the RS-485 MS/TP or LINKnet networks.
Item Description
Cabling For MS/TP and LINKnet networks it is recommended that you use network cabling that
matches the following specifications:
• Balanced 100 to 120 Ω nominal impedance Twisted Shielded Pair (TSP) Cable
• Nominal capacitance of 16 PF/FT or lower
• Nominal velocity of propagation of 66% or higher
Topology For MS/TP and LINKnet networks, ensure the cable is installed as a daisy-chain from one
device to the next.
Max. Nodes
• MS/TP: The maximum number of devices per MS/TP network without any repeaters is 50.
• LINKnet: Up to a maximum of 12 Devices (depending on the controller), only two of
which can be DNT or DFM devices. (Refer to the Appendix called
Working with MS/TP
and LINKnet in the Technical Reference Manual for more information.)
Termination
• MS/TP: A termination resistor must be jumper selected at each end of each MS/TP network
Document Edition 1.9
Page 7 of 12

Delta Controls DNT-T103 Specifications

General

Brand	Delta Controls
Model	DNT-T103
Category	Thermostat
Language	English