Danfoss Series 45, Руководство по обслуживанию, Страница: 26 / 44

LS control
The LS setting is indicated in the pump model code. Refer to the Series 45 Open Circuit Axial Piston Pumps
Technical Information Manual , 520L0519, for more information.
Before performing adjustments, read Pressure measurement .
1. Install a pressure gauge in port M1 or M2 to measure system pressure. Install a pressure gauge in
drain port L1 or L2 to measure case pressure. Tee-in a gauge to the LS / remote PC signal line (port X).
W
Warning
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing
serious injury and/or infection. Relieve pressure in the system before removing hoses, fittings,
gauges, or components.
Unintended movement of the machine or mechanism may cause injury to the technician or
bystanders. To protect against unintended movement, secure the machine or disable / disconnect
the mechanism while servicing.
C
Caution
Contamination can damage internal components and void the manufacturer’s warranty. Take
precautions to ensure system cleanliness when removing and reinstalling system lines.
2. Start the prime mover and allow fluid to reach normal operating temperature. Slowly operate a
hydraulic function that will demand approximately half flow from the pump, but keep system
pressure below the PC set point.
3. Loosen the LS set screw. While watching the pressure gauges, turn the LS adjusting plug until the
desired pressure differential between port M1 or M2 and port X is achieved (1). Clockwise rotation
increases the setting, counterclockwise rotation will decrease it; approximate gain = 17 bar [250 psi]
per turn.
(1) The LS setting is a differential pressure. Subtract pilot pressure at port X from system pressure at
port M2 to compute the actual setting.
4. While holding the position of the LS adjusting plug, torque the LS set screw to 9.5 N•m [7 lbf•ft].
5. Operate a hydraulic function to its full extension loading the pump at maximum pressure and zero
flow.
6. Loosen the PC set screw and turn the PC adjusting plug until the desired setting is indicated on the
pressure gauge at port M1 or M2 (2). Clockwise rotation increases pressure, counterclockwise rotation
decreases it; approximate gain = 42 bar [610 psi] per turn.
If the pressure does not increase, an external system relief valve may require adjustment. External
system relief valve must be set above the PC setting for proper operation.
(2) PC setting is referenced to case pressure. Subtract case pressure from system pressure to compute
the actual setting.
7. While holding the position of the PC adjusting plug, torque the PC set screw to 9.5 N•m [7 lbf•ft].
Service Manual
Series 45 E Frame Open Circuit Pumps
Adjustments
26 | © Danfoss | September 2016 AX00000024en-US0401