A6VM series 65/71 Overview of Displacement Control Methods_思维导图模板

A6VM series 65/71 Overview of Displacement Control Methods

HP –
Proportional control, hydraulic

HP1/HP5

HP1, HP5 – Pilot pressure increase ΔpSt = 10 bar

HP1 positive control
A pilot pressure increase of 10 bar at port X results in an increase in displacement from Vg min to Vg max.
HP5 negative control
A pilot pressure increase of 10 bar at port X results in a decrease in displacement from Vg max to Vg min.

Beginning of control
setting range

2 to 20 bar

Standard setting: beginning of control at 3 bar
(end of control at 13 bar)

Characteristic curve

HP2/HP6

HP2, HP6 – Pilot pressure increase ΔpSt = 25 bar

HP2 positive control
A pilot pressure increase of 25 bar at port X results in an increase in displacement from Vg min to Vg max.
HP6 negative control
A pilot pressure increase of 25 bar at port X results in a decrease in displacement from Vg max to Vg min.

Beginning of control
setting range

5 to 35 bar

Standard setting: beginning of control at 10 bar
(end of control at 35 bar)

Characteristic curve

HP5D1/HP6D1

HP5D1, HP6D1 Pressure control, fixed setting

If the load torque or a reduction in motor swivel angle causes the system pressure to reach the setpoint value of the pressure control, the motor will swivel towards a larger displacement.
The increase in displacement and the resulting reduction in pressure cause the control deviation to decrease. With the increase in displacement the motor provides more torque, while the pressure remains constant.
Setting range of the pressure control valve 80 to 400 bar

EP –
Proportional control, electric

The proportional electric control provides infinite adjustment of the displacement. Control is proportional to the electric control current applied to the solenoid.
EP1, EP2 positive control
▶ Beginning of control at Vg min (minimum torque, maximum permissible rotational speed at minimum control current)
▶ End of control at Vg max (maximum torque, minimum rotational speed at maximum control current)
EP5, EP6 negative control
▶ Beginning of control at Vg max (maximum torque, minimum rotational speed at minimum control current)
▶ End of control at Vg min (minimum torque, maximum permissible rotational speed at maximum control current)

EP1/EP5

Control current

400 to 1200 mA

Characteristic curve

EP2/EP6

Control current

200 to 600 mA

Characteristic curve

EP5D1/EP6D1

EP5D1, EP6D1 Pressure control, fixed setting

The pressure control overrides the EP control function.
If the load torque or a reduction in motor swivel angle causes the system pressure to reach the setpoint value of the pressure control, the motor will swivel towards a larger displacement.
The increase in displacement and the resulting reduction in pressure cause the control deviation to decrease.
With the increase in displacement the motor provides more torque, while the pressure remains constant.
Setting range of the pressure control valve 80 to 400 bar

EZ –
Two-point control, electric

The electric two-point control, allows the displacement to be set to either Vg min or Vg max by switching the electric current to a switching solenoid on or off.

DA –
Automatic control, speed related

The variable motor A6VM with automatic speed-related control is intended for use in hydrostatic travel drives in combination with the variable pump A4VG with DA control. A drive speed-related pilot pressure signal is generated by the A4VG variable pump, and that signal, together with the working pressure, regulates the swivel angle of the hydraulic motor.
Increasing drive speed, i.e. increasing pilot pressure, causes the motor to swivel to a smaller displacement (lower torque, higher rotational speed), depending on the working pressure.
If the working pressure exceeds the pressure command value of the controller, the variable motor swivels to a larger displacement (higher torque, lower rotational speed).
▶ Pressure ratio pSt/pHD = 5/100

DA0 Hydraulic travel direction valve, negative control
Depending on the direction of rotation (travel direction), the travel direction valve is switched by using pilotpressure ports X1 or X2.

DA1, DA2 Electric travel direction valve + electric Vg max override, negative control
Depending on the direction of rotation (direction of travel), the travel direction valve is actuated through the compression spring or the switching solenoid a. When switching solenoid b is energized, the control can be overridden and the motor can be swiveled to maximum displacement (high torque, lower rotational speed) (electric Vg max override).

HA –
Automatic control, high-pressure related

The automatic high-pressure related control adjusts the displacement automatically depending on the working pressure.
The displacement of the A6VM motor with HA control is Vg min (maximum rotational speed and minimum torque). The control device measures internally the working pressure at A or B (no control line required) and upon reaching the beginning of control, the controller swivels the motor from Vg min to Vg max. The displacement is modulated between Vg min and Vg max depending on the load.
HA1, HA2 positive control
▶ Beginning of control at Vg min (minimum torque, maximum rotational speed)
▶ End of control at Vg max (maximum torque,minimum rotational speed)

HA1

A working pressure increase of Δp ≤ approx. 10 bar results in an increase in displacement from Vg min to Vg max. Beginning of control, setting range 80 to 350 bar Specify the desired beginning of control in plain text when ordering, e.g. beginning of control at 300 bar.

Characteristic curve

HA2

A working pressure increase of Δp approx. 100 bar results in an increase in displacement from Vg min to Vg max. Beginning of control, setting range 80 to 350 bar Specify the desired beginning of control in plain text when ordering, e.g. beginning of control at 200 bar.

Characteristic curve

HA.T3

HA.T3 override, hydraulic, remote controlled, proportional
With the HA.T3 control, the beginning of control can be influenced by applying a pilot pressure to port X. For each 1 bar of pilot pressure increase, the beginning of control is reduced by 17 bar.

HA.U

HA.U1, HA.U2 electric override, two-point
With the HA.U1 or HA.U2 control, the beginning of control can be overridden by an electric signal to a switching solenoid. When the override solenoid is energized, the variable motor swivels to maximum swivel angle, without intermediate position. The beginning of control can be set between 80 and 300 bar (specify required setting in plain text when ordering).

HA.R

HA.R1, HA.R2 electric override, electric travel direction valve
With the HA.R1 or HA.R2 control, the beginning of control can be overridden by an electric signal to switching solenoid b. When the override solenoid is energized, the variable motor swivels to maximum swivel angle, without intermediate position. The travel direction valve ensures that the preselected pressure side of the hydraulic motor (A or B) is always connected to the HA control, and thus determines the swivel angle, even if the high-pressure side changes (e.g. travel drive during a downhill operation). This thereby prevents undesired swiveling of the variable motor to a larger displacement (jerky deceleration and/or braking characteristics). Depending on the direction of rotation (direction of travel), the travel direction valve is actuated through the compression spring or the switching solenoid a (see page 25).

HZ –
Two-point control, hydraulic

The hydraulic two-point control allows the displacement to be set to either Vg min or Vg max by switching the pilot pressure at port X on or off.
HZ5, HZ7 negative control
▶ Position at Vg max (without pilot pressure, maximum torque, minimum rotational speed)
▶ Position at Vg min (with pilot pressure > 15 bar activated, minimum torque, maximum permissible rotational speed)

EP1/EP5

Characteristic curve

Circuit diagram HP1, HP2 (positive control)

Circuit diagram HP5, HP6 (negative control)

Circuit diagram HP5D1, HP6D1 (negative control)

Circuit diagram EP1, EP2 (positive control)

Circuit diagram EP5, EP6 (negative control)

Circuit diagram EP5D1, EP6D1 (negative control)

Circuit diagram HZ5 (negative control) sizes 28, 140 to 200

Circuit diagram HZ7 (negative control) size 55 to 107

Circuit diagram EZ5, EZ6 (negative control) sizes 28,140 to 200

Circuit diagram EZ7, EZ8 (negative control) sizes 55 to 107