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Safety and Monitoring
Spool Position Feedback
(-SP)
Direction Indication
Feedback (-DI)
© Danfoss, 2014-03
Fault monitoring overview
Fault
Delay before
Type
monitoring
error out
PVEO
No fault
-
PVEM
monitoring
500 ms
Active
(PVEA: 750 ms)
PVEA
PVEH
PVEP
PVES
PVEU
250 ms
Passive
(PVEA: 750 ms)
500 ms
PVE
Float
Active
750 ms
six pin
1) Measured between fault output pin and ground.
The –SP functionality is a 0,5V to 4,5V inverted feedback with 2,5V as neutral value.
Spool Position Feedback
Spool travel
As shown in the
figure, both "DI-A" and "DI-B" signals are "High" when the spool is in neutral
position. When the spool is moving in the A direction, the "DI-A" signal goes "Low" and the "DI-B"
signal stays "High". The reverse is true when the spool is moved in the B direction.
Direction Indication Feedback (-DI)
DI-A low
DI-B high
-0.8 -0.4
A-port
PVBS towards PVE
Both direction indication signals go low when the error indicator goes high.
Values for both Direction Indicators, pin A and pin B
Transition to low from high
Transition to high from low
Transition to low both pins
Maximum load of "DI-A" , "DI-B"
Voltage U
high by load 20 mA
DC
Voltage U
high by load 50 mA
DC
Voltage low
520L0619 • Rev EB • Mar 2014
Error
Error mode
output
status
-
No fault
Low
Input signal faults
Transducer (LVDT)
High
Close loop fault
No fault
Low
Input signal faults
Transducer (LVDT)
High
Close loop fault
Float not active
High
Float still active
U
s
75% U
DC
U
sp
50% U
DC
U
25% U
s
DC
7 mm
0 mm
Neutral
100%
A port
DI-A high
DI-B low
0
0.4 0.8
B-port
PVBS away from PVE
0.8 ± 0.1 mm [0.031 in]
0.4 ± 0.1 mm [0.015 in]
error pin goes high
50 mA
> U
–1.5 V
DC
> U
–2.0 V
DC
< 0.2 V
Fault
output on
LED light
PVE
1)
-
-
-
< 2 V
Green
Flashing red
∼U
DC
Constant red
< 2 V
Green
Flashing red
~U
DC
Constant red
~U
Constant red
DC
U
sp
4.5V
U
s
2.5V
U
sp
0.5V
Spool travel
7 mm
100%
B port
Spool position 'x'
mm [in]
Memory
(reset
needed)
-
-
Yes
-
No
Yes
5
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