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Description
Overview
Essential details：VT-VPCD-1-16/V0/1-0-1 Driving Axial Pump Units A4VS with HS4-Control
BODAC is used to configure the tables in which the data is defined that will be ex changed between the VPCD and the master over the fieldbus.
In the remainder of this document this will be refered to as Mapping and can be used for field bus Profibus-DP.
This manual only describes the installation and operation of the Controller in regards to the fielbus system. More detailed information about the installation of the controller using the BODAC software can be found in „Installation and operation of the controller VPCD and using BODAC“. A list of available VPCD documentation can be found in the chapter „Additonal documentation“.
Functional description using the A4VS axial piston pump with HS4 control as example
The swivel angle and pressure control as well as the power limitation of the A4VS… variable displacement pump are realized 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).
If the pump does not rotate, in case of depressurized high pressure and actuating system and if enable is not operated, the swash plate is held in the “Zero” swivel angle position by the spring centering.
The position of the swash plate is determined by an inductive position transducer (4), the actual pressure value is recorded by a pressure transducer. Both actual values are supplied to the VT-VPCD control electronics and linked with each other by the software.
The actual power value is calculated from the product of actual pressure value and 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.
In the static condition (i.e. swivel angle command value equals actual swivel angle value, power command value equals actual power value or pressure command value equals actual pressure value) the valve control spool is in central position.
If the superior controllers demand e.g. an increase in the swivel angle (corresponds to an increase in the flow), the valve control spool must be deflected out of the central position until the swivel angle has reached the required value.
The sectional drawing shows the A4VS… variable displacement pump with HS4 control; the proportional valve (1) is controlled using the VT-VPCD control electronics.
Notice for the HS4 control:
With de-energized proportional valve and pump with clockwise rotation and if the set pressure is available, the pump swivels to swivel angle α = 0 (A4VSO design) or α = –100 % (A4VSG design).
VT-VPCD-1-15/V0/1-P-1
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VT-VPCD-1-16/V0/1-0-1 Driving Axial Pump Units A4VS with HS4-Control
Functional description of the control electronics
The control electronics is set-up as printed circuit board, fitted on both sides. It comprises a switching power supply unit [1] creating all internally required voltages.
The central unit is a microcontroller controlling the entire process and realizing the controller functions. Data for configuration, command values and parameters are stored in a FLASH in a non-volatile form.
Four binarily coded digital inputs are used to call up parameter sets (command values) from the memory in which you can store a maximum of 16 sets. A call-up activates a command value for the swivel angle, the pressure and the power limitation as well as ramp times for swivel angle and pressure.
More control inputs have the following functions:
“Command value valid”:
Enabling of the parameter set addressed by the current call-up (H active)
“Enable”:
Activation of the control (H active)
Please note:
H active = activate at high level
Via the differential inputs AI7, AI5 and AI4 [3], the analog command value presetting for the swivel angle, the pressure and the maximum power are specified. With a positive swivel angle command value, the pump swivels in “counterclockwise” swivel direction (= direction of flow P → B). The digital call-up command values are added to the analog command values; the total of both command values is supplied to the controller input via the relevant ramp generators.
The controller output signal controls the output stage [6] depending on the command/actual value differences.
The position of the valve control spool [11], the swivel angle of the variable displacement pump [12a, 12b or 12c] and the system pressure [13] are measured and supplied to the control loop via evaluation electronics [7].
