The instructions below apply to FDP3-BMS interfaces. If a FDP3-BMS-AHU modified interface is to be installed then please read the article FDP3-BMS for AHU (Air Handling Units).
Mounting
The FDP3 interface can be mounted on DIN rails, or on a surface using screws of up to 5mm diameter.
Please contact Toshiba Technical Support for further details on mounting a FDP3 interface inside a Toshiba indoor unit, as they as can advise you better on their products.
TCC-net AB network
TCC-NET Terminals A, B on the FDP3 interface connect to the Toshiba TCC-NET remote controller network. The polarity of the AB network is not critical (this means it would work either way around).
*Note that the FDP3 is powered from this connection and communicates with the indoor unit on this network. Therefore, if the indoor unit looses power the FDP3 interface will loose power too.
Up to 8 indoor units can be wired to one FDP3 (this is called 'group control'). In the case of group control all indoor units in the group receive the same command from the FDP3 interface, but can be monitored individually (for further information read FDP3: How to read data of a unit which is in a group).
Therefore, for individual control install one FDP3 interface for each indoor unit.
Please note that the TCC-NET network is NOT the same as the A-B-C network. If your indoor unit only supports the A-B-C network then contact Toshiba Technical services for information about TCC-link AB connections and A-B-C connections/terminals.
Wired remote controller
The FDP3 interface acts as a remote controller and can be connected together with one Toshiba remote controller.
The FDP3 interface can operate without an additional wired remote controller (therefore it is optional).
DIP switches and Operation modes
The FDP3-BMS offers several operation modes which can be set using the DIP switches. See the article Which FDP3 interface should I use? and the FDP3-BMS installation instructions for details on DIP switch settings.
RS485 network for Modbus communication
The FDP3 interfaces use the RS485 network for Modbus communication. Please read the article RS485 network requirements for further information.
Note that a maximum of 62 FDP3 devices can be placed on a single physical network.
- Each FDP3 has half a standard RS485 network load. An RS485 network can have a maximum of 32 standard network loads. 62 interfaces are allowed based on the assumption that the Modbus master is a standard network load.
Hardwired Inputs (S1 - S6)
Dependent on the operation mode of the FDP3-BMS various parameters can be controlled using the hardwired inputs (S1 - S6). Whether Voltage or electric resistances are used to control the inputs dependes on how the DIP switches are set. The required Voltage/resistance values are listed in the attached installation instructions.
The use of any of the inputs is optional, i.e. if your application doesn't require the use of hardwired inputs then they can be left open.
- If an input of unit operating parameters is left unconnected then the corresponding setting will remain at the default value. The default values are shown in the manual and indicated by a Symbol. These values can be overwritten by the remote controller or Modbus writes (unless either or both are locked).
- If electric resistors (no specific resistors required) are used for control then the resistance values should be within +/-250 ohms of the quoted value. Open circuit is R>200kΩ.
- If several electrical resistance values are wired simultaneously (in parallel) on an Input (e.g. 2.2kOhm, 3.3kOhm, and 4.7kOhm) then the FDP3-BMS interface will only see the total electric resistance value on its input (Note: total value of parallel electric resistances: 1/Rtotal = 1/R1 + 1/R2 + 1/R3...)
- If Voltage is used for control then Voltage values should be within +/- 0.25V of the quoted value. Open circuit for V<1V. Under open circuit conditions the input will revert to its default value.
- If the input value is too close to the outer range (+/- 250 Ohms or +/- 0.25 V) of a quoted value the FDP3-BMS may not react. Therefore, please make sure you're well within the range and test.
- Mixed Voltage/Resistance control is not possible.
- Note that controlling is done 'externally' with your BMS system (Modbus and/or hardwired inputs). How ever the external control is implemented it does not affect the FDP3-BMS operation, as long as the input values are correct.
Please see the FDP3-BMS installation instructions for information on parameters controlled with hardwired inputs and the required Voltage/Resistance values.
Modbus
With Modbus indoor units' parameters can be controlled and monitored. For details regarding the Modbus registers, please read the article List of FDP3 Modbus Registers.
The FDP3-BMS supports the Standard RTU Modbus protocol. Please see the FDP3-Modbus installation instructions for default Modbus communication parameters, as well as Modbus commands. If Baud rate and parity need to be changed then please follow this link for FDP3 baud rate and parity settings.
If the FDP3-BMS is operated in Standard Operation mode (see attached installation instructions and article: Which FDP3 interface should I use?) then control and monitoring via Modbus is possible. In other operation modes the FDP3-BMS is a Modbus master and monitoring is only possible using a Modbus gateway (only 1 Modbus master allowed in a Modbus network).
The Modbus address is set as described on page 4 of the attached installation instructions.
The Modbus registers base is '0'. However, do note that some BMS systems shift the register addresses by '1'.
Note that we offer a software only for testing ModTool communication (see below).
For further information please see this article:
Relays
The relays are Volt-free contacts (dry contacts) and operate as described in the FDP3-BMS installation instructions. Please, when loading the relays do not exceed the power ratings specified on page 4 in the installation instructions (attached below).
Note that the relays do not supply power. They only open/close the circuit.
The relays' default status is normally open and they close when there is respective signal. Hence, when the indoor unit is ON relay R1 closes (even when only the Fan is operating).
If the application requires the relays' functions to be inverted then please read this article: FDP3-BMS: How to invert relays
Status LEDs
The FDP3 LEDs signal various statuses during start-up, as well as during operation. For explanation of the LED (LED 1 and LED 2) signals please see the Installation instructions.
Once communication over TCC-Net between FDP3 and indoor unit(s) has been established LED 3 should be flashing indicating that information is being exchanged between the FDP3 interface and the indoor unit(s).
Faults
- LED 1 is Off and LED 2 remains solid (On).
- Relay R2 closes and respective LED 6 switches ON.
Faults can also be monitored via Modbus. For further information, please read Fault Detection with FDP3-Modbus.
Testing
For testing purposes with Modbus our free software ModTool can be used (please click here for further information).
It is possible to power an FDP3 from a power supply to the TCC-Net AB terminals. Power supply requirements are 15V-24V DC, 50mA, polarity doesn't matter. However, do note that in this case the Modbus register values are '0', because no indoor units is connected.