Required customer end stop – c = 36° ±3°
Internal end stop – d = 40°
MDC torque
Torque required to move handle to maximum displacement
1.4 N•m [12.39 lbf•in ]
Torque required to hold handle at given displacement
0.6 N•m [5.31 lbf•in]
Maximum allowable input torque
20 N•m [177 lbf•in]
MDC Operation
The MDC provides a mechanical deadband required to overcome the tolerances in the mechanical
actuation. The MDC contains an internal end stop to prevent turning the handle into any inappropriate
position.
The MDC provides a permanent restoring moment appropriate for turning the MDC input shaft back to
neutral position only. This is required to take the backlash out of the mechanical connections between
the Bowden cable and the control.
High case pressure may cause excessive wear and the NSS to indicate that the control is not in neutral
position. In addition, if the case pressure exceeds 5 bar there is a risk of an insufficient restoring moment.
The MDC is designed for a maximum case pressure of 5 bar and a rated case pressure of 3 bar.
•
Customers must install some support to limit the setting range of their Bowden cable to avoid an
overload of the MDC.
•
Customers can apply their own handle design but they must care about a robust clamping
connection between their handle and the control shaft and avoid overload of the shaft.
•
Customers can connect two MDC’s on a tandem unit in such a way that the actuation force will be
transferred from the pilot control to the second control. The kinematic of the linkages must ensure
that either control shaft is protected from torque overload.
C
Caution
Using the internal spring force on the input shaft is not an appropriate way to return the customer
connection linkage to neutral, or to force a Bowden cable or a joystick back to neutral position. It is not
applicable for any limitation of the Bowden cable stroke, except the applied torque to the shaft will never
exceed 20 Nm.
MDC Shaft Rotation
CCW
CW
Pump shaft rotation
*
Clock Wise (CW)
Counter Clock Wise (CCW)
MDC shaft rotation
CW
CCW
CW
CCW
Port A
in (low)
out (high)
out (high)
in (low)
Port B
out (high)
in (low)
in (low)
out (high)
Servo port high pressure
M5
M4
M5
M4
*
As seen from shaft side.
Service Manual
MP1
Operation
©
Danfoss | April 2019
AX00000244en-000201 | 21
