Danfoss PVED-CLS User Manual page 30

ENGINEERING TOMORROW
When the Cut-off valve is
0) and closed loop control mode (P3073 set to 255). Danfoss recommends using closed loop control mode.
In ON-OFF control-mode the PWM signal to the cut-off valve will be:

ON: 100% (equal to PVED-CLS power supply)

OFF: 0% (0 VDC)
In closed loop control mode the operator can modify the PWM pre-load, pull current and hold current. This mode
been activated (by setting the hold current lower than the pull current).
The PWM pre-load (P3097) pre-loads the COV-circuit with a given PWM value, before the closed loop control
algorithm is applied, for a period of 120ms. This ensures a fast pulling of the armature. The recommended setting for
P3097 is 100% (P3097 set to 100), assuming solenoid has the same voltage rating as the battery voltage.
The pull- and hold current is controlled by P3074 and P3076, respectively. The cut-off valve needs a relatively high
current to pull the armature, but can afterwards hold it with a lower current, so in order to avoid unnecessary energy
waste, the integrator can set the pull- and hold current to have the least energy-consuming setup. Pull time is
1880ms; in total, a 2000ms period before the hold-current period begins.
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
-1000 -500
Important
, two different control methods are available; ON-OFF control mode (P3073 set to
0 500 1000
-CLS that the pull current (P3074) > hold current (P3076).
1500 2000 2500
Time (ms)
Figure 9
- -off valve has
PWM pre-load (3097)
Current consumption
(P3074 and P3076)
Closed loop algorithm
starts
3000 3500 4000