TSE DPT60, Owner'S Manual

Page: 243 / 459

14
Series 90 Functional Description
PV with 3-Position (FNR) Electric Control
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PV with Electric Displacement Control
Electric Displacement Control (EDC)
The electric displacement control is similar to the hydrau-
lic displacement control with the input signal pressure
controlled by a pressure control pilot (PCP) valve. The
PCP valve converts a DC electrical input signal to a
hydraulic signal which operates a spring- centered four-
way servo valve. This valve ports hydraulic pressure to
either side of a dual-acting servo piston. The servo piston
rotates the cradle swashplate through an angular rotation
of ±17°, thus varying the pump’s displacement from full
displacement in one direction to full displacement in the
opposite direction. The control is designed so the angular
position of the swashplate is proportional to the EDC
input.
Automotive Control (FBA II B)
Automotive Control allows a vehicle to be driven in a
manner similar to an automobile with an automatic trans-
mission.
The Automotive Control includes a three-position electric
control to provide direction control.
3-Position (FNR) Electric Control
This control utilizes a 12 or 24 VDC electrically operated
spool valve to port pressure to either side of the pump
displacement control piston. Energizing one of the sole-
noids will cause the pump to go to its maximum displace-
ment in the corresponding direction.
All functions of the three-position (FNR) electric control
are preset at the factory.
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