Danfoss pved-cl Operation Manual page 67

Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38
Steering by High Priority Steering Device – Open Loop
© Danfoss | May 2016
max time = 1000
500
400
300 Default:
Verm=500
Tro
Tro=200
200
Trh=200
100
min time = 1
0
100 200 300
Ve - Vehicle speed: 1 unit = 0.1 km/h
max time = 1000
500
Default:
400
Verm=500
Tfo
Tfo=350
300
Tfh=200
200 Tfh
100
min time = 1
0 100 200 300
Ve - Vehicle speed: 1 unit = 0.1 km/h
Sr Selects the ramp type. The ramp function can be disabled, fixed or related to vehicle speed. Set Sr to
21 to select vehicle speed dependant ramps.
Lr Sets the linearity of the ramp-up curve.
The default value is a linear ramp.
Lf Sets the linearity of the slow ramp-down curve.
The default value is a linear ramp.
Tro Sets the ramp-up time to open the valve from zero to max port flow when the vehicle speed is 0
kmph. The time applies for both ports.
To gain the best performance, the ramp-up time shall be set larger than the inherent ramp up time of the
main spool. See Technical Data
Tfo Sets the ramp-down time to close the valve from max to zero port flow when the vehicle speed is 0
kmph. The time applies for both ports. It has most effect when the ramp-up time is set larger than the
inherent ramp down time of the main spool. See
Trh Sets the ramp-up time to open the valve from zero to max port flow when the vehicle speed is equal
to Verm kmph. The time applies for both ports.
To gain the best performance, the ramp-up time shall be set larger than the inherent ramp up time of the
main spool. See Technical Data
Tfh Sets the ramp-down time to close the valve from max to zero port flow when the vehicle speed is
equal to Verm kmph. The time applies for both ports. It has most effect when the ramp-up time is set
larger than the inherent ramp down time of the main spool. See
ramp times.
Verm Sets the region (in kmph) where ramp-up (Trh) and ramp-down (Tfh) time is variable to vehicle
speed.
YsetFr Experience shows that ramping down from maximum flow towards medium flows do not cause
as much jerk as ramping down from medium flows towards no flow (close to the valve dead-bands). In
order to "expedite" the ramping at large flows, a flow range can be set up where the spool can move
faster down to a flow range, where the slow down ramp is active. The overall goal with the parameter is
T
saturates
(Ve)
Trh
400 500 600 700 800 900 1000
T saturates
(Ve)
400 500 600 700 800 900 1000
P005 218E
on page 22.
Technical Data
on page 22 for these ramp times.
on page 22 for these data.
Technical Data on page 22 for these
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