Operations & Maintenance Manual
January 2002
Doc: TC02 O&M
Page 8 of 20
Status:
Final
issue: 11
©TB Controls 2011
4.
Master / Slave
Where several controllers are operating in the same space, they must be synchronized via
the Master / Slave interface.
Up to 8 slaves may be used (further options available)
The operating parameters are passed via the data bus (LON)
Up to 8 control plates may be used.
Single Belden 8723 cable connects slaves and control plates
To set the unit to slave mode;
Switch Dipswitch 8 to ON
Master Unit will require Dipswitches 9 and 10 switched to ON and 8 to OFF
Dip Switch 9 and 10 are the Terminating resistors for the LON network on the
Belden 8723 cable
The Slave Address on the LON is set using Dip switches 1, 2, and 3 giving 8
combinations addresses 0 to 7. The switches are set using Binary, (see notes on
setting switches). Each slave unit in a group must have a different address.
The Slave will follow all settings of the Master
Each slave will report its faults to the Control Plate.
Any unit may be set to a Master to suit site conditions; this must be the only Master
unit of the group.
Return air and Off coil temperature sensors are local to each unit
Outside air temperature sensor is connected to the Master this input controls all
slave units.
BMS time switch control signal must be wired to the Master this input controls all
slave units.
4.1.
Phased Start Sequence
The TC02 is designed for soft start, this avoids large numbers of fan decks switching on
simultaneously causing electrical overload or tripping of circuit breakers due to very large
starting currents, each unit has a delay
of „x‟ mS. on power up.
The phased start is set using the Dipswitches 1 to 7. The switches are set using Binary,
(see notes on setting switches)
4.2.
Controller Start sequence
The TC02 has a green LED on board. This LED will flash three times on power up and
afterwards will flash for 20mS every second. Three flashes, flash, flash, flash, indicates the
unit has self tested and is OK. Regular flashing indicates unit is running OK
