16 | © Danfoss | August 2018 AQ00000211
2.2 EHPS SYSTEM
OSPCX
AUX
PLUS+1 Service
tool
Main
Micro-crontroller
Safety
Micro-crontroller
WAS
Solenoid
valve
bridge
Directional
spool
LVDT
Cut -off
valve out put
Vbat-
CAN_saf ety
CAN_Main
AD1
AD2
AD3 (not used)
5V sensor supply +
Sensor ground -
P
T
Main spool position
Main spool position
PVED-CLS
Vb at +
(9 … 32 V )
Vb at -
Key off/de-
energiz e
Cylin der
+V1
+V2
GND1
GND2
OUT1
OUT2
Whee l
Angle
Sensor
5V sersor supply
Sensor ground -
AD1
AD2
Whee l angl e sensor diagram
CAN bus – Steering bus
(Terminate with 120 Ohms in both ends)
SASA-sensor
Vehicle speed
sensor
Auto-guidance
MMI
EHPS-valve
Figure 4 EHPS System
In a EHPS with PVED-CLS, a wheel angle sensor (Danfoss recommend a redundant sensor like illustrated on Figure , to
meet category 2 according to ISO13849) either analogue or CAN-based, a Danfoss SASA-sensor and two channel
vehicle speed sensor on the CAN bus are prerequisite in order to get the PVED-CLS up and running. The system also
requires an MMI installed (for changing programs, steering devices, steering modes etc.). Additionally, an auto guidance
controller and/or an auxiliary device (e.g. mini-wheel, joystick) can be connected to the CAN bus if auto-guidance
and/or auxiliary device steering are required.
When the PVED-CLS is mounted on an EHPS the cut-off valve is not present, therefore P3072 needs to be 0 and the valve
type needs to be set to EHPS by setting P3081 to 1. Furthermore, as the flow direction in an EHPS compared to OSPE/EHi-
E and EHi-H is inverted, the PVED-CLS need to be provided with this information, which can be done by setting P3080
to 255.
The cylinder stroke volume is needed, in ccm. It needs to be entered in P3086 and the number of steering wheel turns
lock-to-lock, without activating the PVED-CLS needs to be entered in P3082.
Important
The OSP displacement (P3084) must be set to 0, when the PVED-CLS is mounted on an EHPS!
The number of steering wheel turns Lock-to-lock is dependent on following:
• EH-spool and pilot flow
• Standby pressure (spring force)
• Cylinder volume
Contact your local technical support at Danfoss Power Solutions for specific calculation, or simply do the
measurement/exercise on the vehicle.
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