C o m m e r c i a l V e h i c l e S y s t e m s P r o d u c t DATA PD-503-200 Function Pneumatic Lift Axle Control Valves are used for the semi-automatic or fully automatic control of air suspended lift axles. All valves automatically lower the lift axle when a predetermined pressure is reached in the suspension air bags of the non-lift axle(s). The pressure at which the valve lowers the lift axle is fully adjustable. Versions with single and dual circuit control are available. With the additional use of a solenoid valve, a version of the valve is available which allows temporary lifting of the laden axle. This feature is signalled electronically from the tractor cab and is designed to provide additional traction capability on the tractor s drive axles since, when the trailer lift axle is raised, the drive axle will see an increase in load. Note: The national legal requirements for this function must be taken into account! LS1500 Pneumatic Lift Axle Control Valves are supplied complete with pre-installed push-in fittings. A mounting support is also included with the valve. Standard Symbol as DIN ISO 1219 LS1500 p 23 p 12 p 22 p 21 p 11 Technical Features Maximum operating pressure: 14.0 bar Operating temperature range: -35 C to +80 C Weight: 0.9 kg approx. Push-In fittings: Ø 8.0 mm Nominal way through: Ø 5.0 mm Adjusting range - automatic lower: 2.3 to 5.8 bar Adjusting range - automatic raise: 0.9 to 2.7 bar Damping reservoir: Integral Test Report: TÜV Report No. 390-0582-96 p 3 p 23 p 12 p 22 p 21 p 11 p 1 mce-1 p 1 p 3 mce-2 p 2 p 3 p 4 p 1
PD-503-200 P r o d u c t D a t a Range Overview Part Number Semi-automatic: Manual Raise Automatic Lower Fully Automatic: Automatic Raise Automatic Lower Temporary Raise Manual Lower of of Laden Axle * Unladen Axle ** Control of two lift axles by two valves Number of control circuits LS1500 Standard - - - Standard 2 - Standard Option Option Standard 2 - Standard Option Option Standard 1 * see Traction Assist section - page 6 ** see Lowering the Lift Axle section - page 7 Optional Accessories Part Number/ Type Number LS2510 I63411024 AE9120 Description Solenoid valve to temporarily raise laden axle Solenoid valve to lower unladen axle II36061.. AE4265 1) Manual push/pull valve and solenoid valve to lower unladen axle 04810043 2) LS1051 DB11.. Lift bag pressure retention valve, retains a pressure of 0.5 bar and thereby protects the lift bag from damage Lift bag pressure limiting valve 1) AE4265 = push/pull valve 2) 04810043 = valve with rotating button For use with LS1500 LS1500 Comments See Traction Assist section - page 6 See Lowering the Lift Axle section - page 7 See Lowering the Lift Axle section - page 7 If requested by the trailer manufacturer Maintenance The synthetic exhaust filter must be changed annually. Part Number: LS2888 Mounting Position The valve must be mounted in a way that no water can enter the exhaust filter. 2
C o m m e r c i a l V e h i c l e S y s t e m s PD-503-200 Dimensions LS1500 215 178 110 LS 1500 11 21 22 12 23 117 200 110 140 LS 2000 11 21 22 12 23 3 200 110 105 KNORR BREMSE LS 3000 1 3 4 2 3
PD-503-200 P r o d u c t D a t a Setting Procedure Note: The default settings are: Automatic Lower Lift Axle pressure Automatic Raise Lift Axle pressure 3.4 bar 1.7 bar 1. 2. 3. Connect the valve according to the system diagram on the test bench or on the vehicle. Inflate port 1 with supply pressure (min. 6.5 bar). Connect a pressure regulating valve to the Test and Simulation port to simulate the switching pressures for Lower and Raise. Set pressure for Automatic Lower Lift Axle 4. Slacken locknut (27 mm A/F under the black protection cap), whilst holding the slot-headed screw. 5. Turn the slot-headed screw: clockwise = increase the pressure at which the axle is lowered anticlockwise = decrease the pressure at which the axle is lowered 6. Whilst holding the slot-headed screw, tighten the locknut and replace protection cap. Adjust pressure for Automatic Raise Lift Axle ( and only) 7. 8. 9. 10. 11. If automatic Lower Lift Axle pressure has been adjusted, the automatic Raise Lift Axle pressure will have changed by a similar amount, i.e. a 0.5 bar increase in Lower Lift Axle pressure will result in an increase of approximately 0.5 bar in the Raise Lift Axle pressure. If the automatic Raise Lift Axle pressure needs to be adjusted remove the yellow protection cap. See the Control Pressure Diagram for the possible range of adjustment of this pressure. Turn the internal hexagon socket: clockwise = decrease the pressure at which the axle is raised anticlockwise = increase the pressure at which the axle is raised. Replace the yellow protection cap. Adjusting Screws: Screw for setting the pressure for lowering (automatic lowering of the lift axle) + Test and Simulation connector Screw to adjust the control range (automatic raising of the lift axle) +
C o m m e r c i a l V e h i c l e S y s t e m s PD-503-200 Control Pressure Diagram Air bag pressure at static axle(s) [bar] 7 6 5 Example: Switching Point (Automatic Lower Lift Axle ) = pressure at which automatic lowering of the lift axle(s) takes place = set at 4.5 bar in this example Switching Point (Automatic Raise Lift Axle ) = pressure at which automatic raising of the lift axle(s) takes place = in this example it is adjustable within the range 1.75 to 3.0 bar Switching Point (Automatic Lower Lift Axle ) Example 4 3 Range of adjustment for Switching Point (Automatic Raise Lift Axle) 2 1 0 5
PD-503-200 P r o d u c t D a t a Traction Assist The Traction Assist function allows temporary lifting of a laden axle on a semitrailer. This will result in an increase in load on the tractor s drive axle and therefore improved traction. The use of Traction Assist must adhere to any national legal requirements. The control device in the tractor should be a spring return tip switch. Traction Assist is achieved by upgrading or. Additional component required: One Solenoid Valve LS2510 (ready for assembly) Please order separately! Assembly: On and remove circlip holding the blanking plate (see arrow). Insert the Solenoid Valve LS2510 (with pre-assembled plate and circlip). Connect the control cable to the solenoid valve. The cable should then be securely attached to the chassis leading to the point where it is to be connected to the tractor interface (normally via the 24S electrical trailer connection). Adjustment screw with yellow protection cap 23 or 2/3 Dimensions, with solenoid for Traction Assist 207 110 140 LS 2000 11 21 22 12 23 3
C o m m e r c i a l V e h i c l e S y s t e m s PD-503-200 Lowering the Lift Axle When using the fully automatic valves, or, the lift axle is always raised when the vehicle is unladen. However, there may be situations when the lift axle needs to be lowered when the vehicle is unladen. For example: When checking the brakes on a rolling road When parking the vehicle To reduce the turning radius (by reducing the effective wheelbase) The required 3/2 Valves can be installed individually or in-line in the supply line to port 1 of the Lift Axle Valve. 1 2 manually 3 2 1 Electrically from the tractor P R A 1 Examples: II36061 (AE4265) 3/2 Valve with push button to lower lift axle manually 04810043 3/2 Valve with turning button to lower lift axle manually I63411024 (AE9120) 3/2 Valve to lower lift axle electrically (signalled from the towing vehicle)
PD-503-200 P r o d u c t D a t a System Diagram Example, dual circuit: 3-axle bogie without Raise / Lower Valve 1 Lift Axle with fully automatic control
C o m m e r c i a l V e h i c l e S y s t e m s PD-503-200 System Diagram Example, dual circuit: 3-axle bogie with Raise / Lower Valve 1 Lift Axle with fully automatic control
PD-503-200 P r o d u c t D a t a System Diagram Example, single circuit: air suspension system for 3-axle semi-trailer with fully automatic control lift axle control 10
C o m m e r c i a l V e h i c l e S y s t e m s PD-503-200 System Diagram Example, single circuit: air suspension system for 3-axle semi-trailer with fully automatic control lift axle control, with raise/lower function 11
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