R901495806 Rexroth DIGITAL CONTROL ELECTRONICS FOR AXIAL PISTON PUMPS

Digital control electronics for the axial piston pump A4VS with HS5 control from size 40 to size 1000 Bus connection (slave)/Service interface (TCP/IP) switchable by parameters (Sercos, EtherNet/IP, PROFINET RT, EtherCAT, Powerlink, PROFIBUS DP) Pressure and swivel angle controller Parameterizable torque limitation Optional: Speed-variable function Leakage compensation Master/slave capability Mooring capability CE mark according to EMC Directive 2004/108/EC Optional: PLC functionality according to IEC 61131-3
 

Functional description using the A4VS axial piston pump with HS5 control as an example

The swivel angle and pressure control as well as the torque limitation of the A4VS… variable displacement pump are effected by an electrically controlled proportional valve (1). Via the actuating piston (2) of the pump, this valve determines the position of the swash plate (3).

The position of the swash plate is determined by a swivel angle sensor (4); the actual pressure value is recorded by a pressure transducer.

The actual torque value is calculated from the product of the actual pressure value and the actual swivel angle value. The controller software ensures by means of a minimum value generator that the controller corresponding to the working point is always active.

The sectional drawing shows the A4VS… variable displacement pump with HS5 control; the proportional valve (1) is controlled using the VT-HPC control electronics.

Description

The VT-HPC (Hydraulic Pump Control) is a digital control system with integrated controller, optionally with programming according to IEC 61131. The internal PLC functionality is activated by plugging the SD card SD-HPC-PLC. It is not included in the VT-HPC scope of delivery and must be ordered separately.

The following controller functionalities are available:

Pressure control Swivel angle/flow control Torque limitation Optional: Speed-variable function (n function)

This enables, amongst others, the following operating modes:

Pressure/swivel angle control Pressure/flow control

Command value presetting is done via the bus interfaces (XF20/XF21 or XF30), via the analog interface (XG20) or, alternatively, via an internal PLC program.

The feedback information of the actual value signals to the superior control system is provided optionally either via the bus interfaces (XF20/XF21 or XF30) or the analog/digital interface (XG20).

The controller parameters are set via one of the two Ethernet interfaces (XF20/XF21) (integrated switch functionality)

Monitoring

The digital control electronics enable comprehensive monitoring functions/error detection including:

Undervoltage Communication error Cable break for analog sensor inputs (4 … 20 mA) Short-circuit monitoring for analog/digital outputs Temperature of the integrated electronics

IndraWorks PC program

To implement the project planning task and to parameterize the VT-HPC, the user may use the IndraWorks DS operation tool. For the use of the PLC function, IndraWorks MLD is necessary: