Sauer Danfoss 40 Series - External Control Handle Requirements; Handle Direction; Neutral Start Switch (NSS)

520L0635 • Rev EH • June 2009
44
Series 40 Axial Piston Pumps
Technical Information
Control options
External control handle requirements
Rotation of the control handle to reach full pump displacement is 20°. Maximum handle
rotation is 25°. There is a neutral deadband of ±1.5° (±3.0° with NSS option). A nominal
control handle torque of 1.2 N•m [11 in•lbf] is required to begin handle rotation (1°) and
1.7 N•m [15 in•lbf] is required to reach full stroke (20° handle rotation). An optional high
rate return spring is available which requires 2.5 N•m [22 in•lbf] and 3.4 N•m [30 in•lbs]
to reach 1° and 20° respectively. The maximum allowable handle input torque is 17 N•m
[150 in•lbf].
Handle direction
The MDC handle can be congured in either the up or down positions. The up position is
shown on the previous page. The down position is oriented 180° of the up position.
Neutral start switch (NSS)
This safety feature is an option to prevent start-up when the pump is not in neutral. It
provides an electrical switch contact which is closed when the control handle is in its
neutral (0°) position. The switch contact will open when the control handle is rotated
1.5 to 2° clockwise (CW) or counterclockwise (CCW) from neutral. The switch is rated at
5 amperes inductive load at 12 or 24 Vdc. The NSS should be wired in series with the
engine starting circuit and is intended to verify the neutral position of the pump before
allowing the engine to start.
This switch is available with screw terminals (no connector) or with a Packard Weather-
Pack
TM
2-way sealed connector.
Pump displacement vs control lever rotation
Handle
configuration
Swashplate position (ref. above
chart)
Swashplate
movement
begins (point A)
degrees
Full displacement
reached
(pont B) degrees
Standard 1.5° 20°
with NSS 3.0° 20°
Switch position on
neutral
Closed
Neutral play
± 1.5°~2°
VDC 12 or 24
Rated current (A) 5
Connector type
Screw or Weather-
Pack
TM
100%
100%
CW
Handle rotation
CCW
Handle rotation
Pump
displacemen
t
Pump
displacement
a
b
25 Maximum
a
b
25 Maximum
MANUAL DISPLACEMENT
CONTROL (MDC) M46
VARIABLE PUMP
(continued)
MDC signal required for swashplate position NSS specifications