Danfoss PVED-CLS, User Manual, Page: 45 / 182

© Danfoss | August 2018 AQ00000211 |
45
ENGINEERING TOMORROW
Furthermore, if the PVED-CLS is mounted on a EHPS, then the flow direction needs to be inverted (P3080 set to 255)
and the turns lock-to-lock on the steering wheel (when the electronics are not activated, hence pure hydraulic steering)
needs to be entered in P3082 (resolution is 0.01 turns).
7.5 LVDT COMPENSATION AND SPOOL THRESHOLD AT BOOT-UP
7.5.1.1 LVDT compensation
The LVDT feedback signal, which is the EH-spool feedback to the PVED-CLS, can be compensated for temperature
changes by setting P3089 to 255.
By Default,
LVDT Offset compensation is Enabled i.e. P3089 is set to 255.
Important
Danfoss recommends to keep the LVDT compensation always active. LVDT compensation should only be disabled when
performing diagnostic troubleshooting on the PVED-CLS.
7.5.1.2 Spool threshold at boot-up
When power is applied to the PVED-CLS, the spool needs to be in neutral. The +/- tolerance, given in x10µm, is controlled
by P3090. If the spool is outside this threshold during boot-up and the PVED-CLS is mounted on an OSPE/EHi, the
PVED-CLS will go into safe state. If the PVED-CLS is mounted on an EHPS, further checks are done to see if the spool
has moved outside the dead-band, a confidence counter level has to be reached before PVED-CLS will go into safe state.
Important
Danfoss recommends to keep the parameter P3090 at default value (P3090 set to 25) unless problems/failures occurs with
the default value, this should not be changed.
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.
LVDT offset
compensation
Enable/Disable
P3089 U8 -
LVDT Offset compensation Enable/Disable
Valid Values: 0 (DISABLE); 255 (ENABLE)
OEM 0 255 255
Absolute spool neutral
threshold range
P3090 U8 10 um Absolute value of Spool neutral threshold range at boot-up OEM 0 200 25
Table 14
7.6 ANALOGUE INTERFACE
7.6.1.1 AD low-pass filter
A configurable (by P3249) first-order low-pass filter is applied before the AD sampling.
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.
AD low pass filter cut-
off frequency
P3249 U8 dHz
5V sensor, AD1 and AD2 filter cut-off frequency
Resolution: 1 dHz = 0.1 Hz
OEM 5 200 100
Table 15
Important