Danfoss PVE Series 4 - Direction Indication Feedback (-DI)

Spool position feedback (-SP)
Spool travelSpool travel
0.5V
7 mm
100%
B port
7 mm
100%
A port
0 mm
Neutral
2.5V
4.5V
Usp
Us
Us
Us
Usp
Usp
25% U
DC
50% U
DC
75% U
DC
Direction indication feedback (-DI)
PVE with build in indication for spool movement direction are available.
The PVE–DI has dual power supply. U
DC1
only supplies solenoid valves. U
DC2
supplies electronics and feed
back. The PVE does not work without U
DC2
. DI-A and DI-B are relative standard mounting. The input
signal fault monitoring is disabled if U
DC1
is disabled. DI-A and DI-B are relative standard mounting.
The DI has two direction feeedback signals with output high (close to U
DC
) when the spool is in neutral
position. If the spool moves out of neutral position, the direction signal switches to low (< 0.2 V). One of
the signals goes low by spool ~0,8 mm out of neutral and high by spool within 0,4 mm out of neutral.
Both direction indication signals go low when the error indicator goes high.
Direction indication feedback
DI-A low
DI-B high
DI-A high
DI-B low
Spool position ‘x’
mm [in]
B-port
PVBS away from PVE
A-port
PVBS towards PVE
0.4 0.8-0.8 -0.4 0
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.
Values for both Direction Indicators, pin A and pin B
Transition to low from high 0.8 ± 1 mm [0.031 in]
Transition to high from low 0.4 ± 1 mm [0.015 in]
Transition to low both pins error pin goes high
Maximum load of “DI-A” , “DI-B” 50 mA
Voltage DI high by load 20 mA > U
DC
– 1.5 V
Voltage DI high by load 50 mA > U
DC
– 2.0 V
Voltage DI low < 0.2 V
Technical Information PVE, Series 4 for PVG 32/100/120 and PVHC
Safety and monitoring
520L0553 • Rev GD • Jan 2014 17