Pressure Valve

General

Pressure control type

Range

Prop. valve / Servo motor

Default

Prop. valve

Units

Access

Administrator

Function

This parameter defines the method of pressure control for hydraulic pump used in the machine.

Description

With the help of this parameter, user can select whether pressure from hydraulic pump is controlled by using proportional solenoids or servo motor.

Pressure control method

Range

VDrive 106 / External

Default

VDrive 106

Units

Access

Administrator

Function

This parameter defines the method of controlling proportional valves used in the machine.

Description

With the help of this parameter, user can select whether VDrive 106 or an external amplifier is used for controlling proportional valves for pressure control.

This parameter is available only when Prop. Valve is selected in Pressure control type parameter.

Pressure valve current

Range

0-3000

Default

700

Units

Access

Administrator

Function

This parameter defines the maximum current of system pressure valve used in the machine.

Description

With the help of this parameter, the full range of system pressure control analog output is utilized. Thereby the resolution of the system command pressure is increased. Hence it is possible to control the system pressure at very minimum.

This option is only available when VDrive 106 is selected in Pressure control method.

Calibration

Range

ON/OFF

Default

Units

Access

Administrator

Function

This parameter enables/disables the calibration of system pressure valve.

Description

This parameter must be ON if you want to calibrate proportional pressure valve control. The calibration of the pressure valve is done by defining the relation between the controller voltage command (Range: 0 to 10V) and the pressure (bar) which is programmed in a table.

The relation between the pressure and voltage can be entered in a table by pressing the calibrate softkey available in the page.

Calibrate

Calibration Procedure (Only available in access level service)

Set the calibration parameter to ON and save it (Close machine settings then save).

Pressure calibration ON option will be available only when crowning Calibration is set to OFF in Y-Axis Parameters > Crowning > General.

Again, go to the same page, you can find the softkey "Calibrate".
Press the calibrate button, a new page called “Pressure calibration” will appear on the screen.
Default voltage calibration step is 0.5 V and total number of points is 20. The calibration step, no. of points can be changed using the soft key “Delete Entry”, “Add Entry”.

The display “Voltage”, “Pressure”, “Servo speed” (if pressure control type is set to servo) and “Feedback” shows the active voltage command, actual pressure value and captured pressure value respectively.

When the Pump servo control is used, during calibration (crowning and system pressure) the speed of the pump needs to be maintained constant and it depends on the type of the machine and the pump. So, servo speed is displayed in the calibration page of the system pressure valve and in crowning if it is hydraulic.

The controller accepts the active voltage command only after pressing the foot pedal open switch, to ensure the safety.
For the given Voltage, the actual Pressure values can be captured by pressing the soft key “Teach Entry” which updates the “Feedback” display.
Now, compare the captured feedback and actual pressure value, if it is OK then press the soft key “Update Entry”, it will update the table with respective display values of voltage and pressure.
Also, it is possible to enter the values manually.

Force

Minimum pressure

Range

0-99

Default

Units

Bar

Access

Administrator

Function

This parameter defines the minimum working pressure required to move RAM in downward direction.

Description

Generally, this pressure refers to the counterbalance pressure with which the RAM is held firmly without moving down in idle condition. Hence, in order to move the RAM down, this is the minimum pressure required. During the pressing phase, if the computed pressure is less than this parameter, it is limited to this value.

Maximum force

Range

0-99999

Default

1000

Units

Access

Administrator

Function

This parameter defines the maximum tonnage of press brake.

Description

If the computed force is greater than force max, then the control command will be limited to this value.

It is important that the maximum pressure entered in the pressure calibration table corresponds to this maximum force.

Pump

When Pressure control type is selected as Servo motor, then the following parameters are available to be configure:

Pressure table

Default

Servo linear / Pressure table

Units

Access

Administrator

Function

This parameter defines the maximum torque of the servo motor.

Description

This parameter is used to select the torque calculation method used to control the system pressure.

If pressure table is selected then calibration parameter will be available in Y axis Parameter → Pressure valve → General.

If calibration is ON pressure table option is available.

Calibration option is not available once Servo linear is selected. The torque is computed theoretically according to required pressure.

Pump Speed Programmable

Range

0 - 3000

Default

1200

Units

RPM

Access

Administrator

Function

This parameter defines the servo RPM while moving manually in jog mode.