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Controllers. H1L. Load Sensing with hydraulic override
03
04
In addition to the load sensing function, HPR-02 pumps with H1L-controller offer the possibility of overriding the ∆p LS-signal
hydraulically. This enables either a so called mode control for selecting different operation points or establish a power limit regula-
tion (underspeed control). The integration of all functions in the pump controller enables direct signal transfer without delay. The
controller-specific data are independent of the nominal pump size. The H1L-controller is particularly useful for tandem configura-
tions of two HPR-02 pumps, in which the first is equipped with an E1L-controller. The second pump with H1L-controller uses the
resulting hydraulic signal of the first controller and follows the first pump's actions (master-slave-configuration).
A
D1
P1
P
P
A
T
In the event of hydraulically overriding the LS-signal, a control pressure is applied to the port "A" of the controller. This pressure
acts proportionally against the LS-spring, and the LS signal is modulated accordingly. This causes the pump to swash back, thereby
reducing its output. The function between control pressure at the port A and the associated ∆p LS value is shown in the following
diagram.
∆p LS-reduction
03
04
4
3
2
1
0
5
10
Pilot pressure pstA [bar]
16 bar ∆p setting
1
20 bar ∆p setting
2
25 bar ∆p setting
3
28 bar ∆p setting
4
05
06
H1L
LS2
LS1
X
X
T
0
max
U
L
05
06
15
20
25
30
07
08
Projekt-Name:
Projekt-Titel:
Dokument-Name:
Dokument-Titel:
Projekt-Ersteller:
H1L-controller
Dokument-Ersteller:
Erstellt am :
Zuletzt gespeichert:
07
08
09
10
HPR-02-A2-H1L0_Schaltplan_Katalog_v01
Schaltplan_H1L
RA3 - P.Schlee
RA3 - P.Schlee
16.03.2012 14:42:37
16.03.2012 15:02:35
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10
11
01
02
03
04
05
06
07
08
11
25
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