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6. COMMUNICATION OF THE RS485 SLAVE, MODBUS RTU
6.1 Communication of the RS485 Slave, Modbus RTU with Danfoss FC51 inverter
Please see the website below in order to obtain technical documentation of Danfoss inverters.
http://www.danfoss.com/poland/businessareas/drivessolutions/frconverters/vlt+micro+drive.htm
Fig. 3 Example for double air supply, double air exhaust, rotary or glicol heat exchanger
Fig. 4 Example for single air supply, single air exhaust, rotary or glicol heat exchanger
Table No. 6
Danfoss FC51 inverters configuration, RS485 control
Code Name Set point value Description
1-03 Torque specs. 0 Constant torque
1-20 Rated motor output ...kW Motor rating plate
1-24 Rated motor current ...A Motor rating plate
1-25 Rated motor speed ...rpm Motor rating plate
1-90 Thermal motor protection 4 Emergency ETR only
3-02 Min requested frequency 0.000 Always enter this value
3-03 Max requested frequency Fz max Custom setting
3-17 Source of requested value 3 11 Modbus
4-12 Min. output frequency 15.0 Always enter this value
4-14 Max. output frequency Fz max Custom setting
4-16 Output current limit 150.0
5-40 Relay function 6 Operation without alarm
8-01 Control location 0 Digital and control word
8-02 Source of control word 1 FC RS485
8-03 Communication latency time 10.0
8-04 Reaction on communication time-out 2 Stop
8-30 Selection of communication protocol 2 Modbus RTU
8-31 Inverter address in Modbus -
8-32 FC port baud rate 2 9600
8-33 FC port parity 3 No parity, 2 stop bits
NOTE:
Fz max – inverter frequency for operation with max fan air flow (resulted from air distribution system adjustment). Initially enter the frequency from the AHU technical documentation.