Operating instructions

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Neo
Installation & Operating Instructions
Page 40
9.2.2 Modbus Control & Monitoring Registers
The following is a list of accessible Modbus Registers available in the Fenner QD:Neo drive.
• When Modbus RTU is configured as the Fieldbus option (P5-01 = 0, factory default setting), all of the listed registers can be accessed.
• Registers 1 and 2 can be used to control the drive providing that Modbus RTU is selected as the primary command source (P1-12 = 4)
• Register 3 can be used to control the output torque level providing that
- The drive is operating in Vector Speed or Vector Torque motor control modes (P4-01 = 1 or 2)
- The torque controller reference / limit is set for ‘Fieldbus’ (P4-06 = 3)
• Register 4 can be used to control the acceleration and deceleration rate of the drive providing that Fieldbus Ramp Control is enabled (P5-
08 = 1)
• Registers 6 to 24 can be read regardless of the setting of P1-12
Register
Number
Upper Byte Lower Byte Read
Write
Notes
1 Command Control Word R/W
Command control word used to control the Fenner QD:Neo when operating with
Modbus RTU. The Control Word bit functions are as follows :-
Bit 0 : Run/Stop command. Set to 1 to enable the drive. Set to 0 to stop the drive.
Bit 1 : Fast stop request. Set to 1 to enable drive to stop with 2nd deceleration ramp.
Bit 2 : Reset request. Set to 1 in order to reset any active faults or trips on the drive.
This bit must be reset to zero once the fault has been cleared.
Bit 3 : Coast stop request. Set to 1 to issue a coast stop command.
2 Command Speed Reference R/W Setpoint must be sent to the drive in Hz to one decimal place, e.g. 500 = 50.0Hz
3 Command Torque Reference R/W Setpoint must be sent to the drive in % to one decimal place, e.g. 2000 = 200.0%
4 Command Ramp Times R/W
This register specifies the drive acceleration and deceleration ramp times used
when Fieldbus Ramp Control is selected (P5-08 = 1) irrespective of the setting
of P1-12. The input data range is from 0 to 60000 (0.00s to 600.00s)
6 Error Code Drive Staus R/W
This register contains 2 bytes.
The Lower Byte contains an 8 bit drive status word as follows :-
Bit 0 : 0 = Drive Disabled (Stopped), 1 = Drive Enabled (Running)
Bit 1 : 0 = Drive Healthy, 1 = Drive Tripped
The Upper Byte will contain the relevant fault number in the event of a drive trip.
Refer to section 11.1 for a list of fault codes and diagnostic information
7 Output Frequency R Output frequency of the drive to one decimal place, e.g.123 = 12.3 Hz
8 Output Current R Output current of the drive to one decimal place, e.g.105 = 10.5 Amps
9 Output Torque R Motor output torque level to one decimal place, e.g. 474 = 47.4 %
10 Output Power R Output power of the drive to two decimal places, e.g.1100 = 11.00 kW
11 Digital Input Status R Represents the status of the drive inputs where Bit 0 = Digital Input 1 etc.
20 Analog Level 1 R Analog Input 1 Applied Signal level in % to one decimal place, e.g. 1000 = 100.0%
21 Analog Level 2 R Analog Input 2 Applied Signal level in % to one decimal place, e.g. 1000 = 100.0%
22 Pre Ramp Speed Reference R Internal drive frequency setpoint
23 DC Bus Voltages R Measured DC Bus Voltage in Volts
24 Drive Temperature R Measured Heatsink Temperature in °C
9.2.3 Modbus Parameter Access
All User Adjustable parameters (Groups 1 to 5) are accessible by Modbus, except those that would directly affect the Modbus
communications, e.g.
• P5-01 Communication Protocol Select
• P5-02 Drive Fieldbus Address
• P5-03 Modbus RTU Baud Rate
• P5-04 Modbus RTU Data Format
All parameter values can be read from the drive and written to, depending on the operating mode of the drive – some parameters
cannot be changed whilst the drive is enabled for example.
When accessing a drive parameter via Modbus, the Register number for the parameter is the same as the parameter number,
E.g. Parameter P1-01 = Modbus Register 101.
Modbus RTU supports sixteen bit integer values, hence where a decimal point is used in the drive parameter, the register value will
be multiplied by a factor of ten,
E.g. Read Value of P1-01 = 500, therefore this is 50.0Hz.
For further details on communicating with drive using Modbus RTU, please refer to your local Fenner Authorised Distributor.