Response Time - Sauer Danfoss 40 Series Technical Information

manuaL DisPLaCement
ContRoL (mDC)
(continued)
Series 40 Axial Piston Pumps
Technical Information
Control options
MDC on M46 PV
CCW CW
20°
MDC with NSS M46 PV

Response time

The time required for the pump output flow to change from neutral to full flow
(acceleration) or full flow to neutral (deceleration) is a function of the size of the supply
orifice in the control inlet passage and the size of the drain orifice in the control sleeve.
A range of orifice sizes is available to
assist in matching the rate of swashplate
response to the acceleration and
deceleration requirements of the
application.The table at right shows
some sample response times under
certain conditions. (These figures
-1
assume 1775 min (rpm), 140 bar [2000
psi] system pressure, and 20 bar [290 psi]
charge pressure.) Test system pressure to
determine the proper orifice sizes for the
desired response.
520L0635 • Rev EH • June 2009
MDC Hydraulic schematic
20°
Pump flow direction with MDC control
PV or Front
PT
Rear PT
High Servo Gauge Port
Refer to pump installation drawing for port
P100 598
(Handle up* option shown)
locations.
MDC Response time
0.9 [0.036] 0.8 [0.031]
0.9 [0.036] 1.2 [0.046]
1.4 [0.054] 1.2 [0.046]
*Contact Sauer-Danfoss for special orifice
combinations.
B N A
M3
E
M4
M5
L2
L1 S
input shaft Rotation
Cw
Handle CW
Rotation
Port A Flow Out
Port B Flow In
Handle CW
Rotation
Port C Flow In
Port D Flow Out
M4
orifice diameter* average response time
mm [in]
Supply Drain Acceleration
2.5
2.0
1.2
None 6.4 [0.050] 0.5
A
M1
M2
B
P100 587E
CCw
CCW CW CCW
In In Out
Out Out In
CCW CW CCW
Out Out In
In In Out
M5 M4 M5
[seconds]
Deceleration
1.9
1.4
0.9
0.4
43