Danfoss PVED-CLS, User Manual, Page: 38 / 182

38 | © Danfoss | August 2018 AQ00000211
ENGINEERING TOMORROW
Important
There is no validation in the PVED-CLS that P3074: Cut-off valve CL pull current > P3076: Cut-off valve CL hold
current.
Important
Danfoss recommends not to change the default values for P3074, P3076 and P3097.
Contact your local technical support at Danfoss Power Solutions if there is a need to change these parameters.
Name
A
ddr
es
s
D
at
a t
yp
e
U
ni
t
Description of parameter
U
se
r
Range
D
a
nf
o
ss
de
fa
ul
t
val
u
e
S
a
fet
y
cri
ti
ca
l
p
a
ra
m
et
ers
‘
S
’
Mi
n
.
M
ax.
Cut-off valve present P3072 U8 -
Cut-off Valve Present/Not Present
Valid Values: 0 (NOT PRESENT); 255 (PRESENT)
OEM 0 255 255 S
Cut-off valve control
mode
P3073 U8 -
Cut-off Valve control mode Close loop Control or ON-OFF control
Valid Values: 0 (ON-OFF control); 255 (Closed loop control)
OEM 0 255 255 S
Cut-off valve CL pull
current
P3074 U16 mAmp Current required to activate Cut-off valve OEM 100 2000 1100 S
Cut-off valve CL hold
current
P3076 U16 mAmp Current required to maintain Cut-off in ON state OEM 100 2000 500 S
Cut-off valve PWM pre-
load value
P3097 U8 % Cut-off valve PWM pre-load value OEM 0 100 100
Table 8
7.1.2 Cut-off valve monitoring
The PVED-CLS continuously monitors the cut-off solenoid valve current level and if it exceeds the defined threshold of
2500mA, the PVED-CLS will de-energize the cut-off solenoid valve and enter safe state.
Furthermore, in off-road mode the PVED-CLS will monitor if the cut-off solenoid valve current level drops below half
of the setting of
P3076: Cut-off valve CL hold current . If the cut-off solenoid valve current is found below this level, the
PVED-CLS will de-energize the cut-off solenoid valve and enter safe state.
Whenever switching from on-road mode to off-road mode, the PVED-CLS is performing diagnostics on the cut-off valve,
this is called off-road safety check. If the off-road safety check is not successfully completed, a change to off-road mode
will not be permitted and thus no electro-hydraulic steering will be available. Two different off-road safety checks can be
executed, depending on the valve type.
7.1.2.1 Cut-off valve monitoring for OSPE, EHi-E
This safety check will be executed if P3081: Valve type is set to 0 (OSPE, EHi-E) and a mode change from on-road
mode to off-road mode is requested.
The PVED-CLS checks that the EH-valve main spool can move to a set-point, inside the mechanical deadband, within
the time specified by
P3078: Cut-off valve monitoring POST timeout , when it is commanded to do so and the cut-off
solenoid valve is turned on. Then the PVED-CLS checks that the EH-valve main spool cannot move when the cut-off
solenoid valve is turned off, even though the EH-valve main spool is commanded to.