Linde HPR-2 - Controllers. H1 L. Load Sensing with hydraulic override; Ap LS-reduction; H1 L-controller

25
Controllers. H1L. Load Sensing with hydraulic override
∆p LS-reduction
16 bar ∆p setting
20 bar ∆p setting
25 bar ∆p setting
28 bar ∆p setting
4
3
2
1
∆p LS [bar]
Pilot pressure pstA [bar]
0 5 10 15 20 25 30
4
3
2
1
01
01
02
02
03
03
04
04
05
05
06
06
07
07
08
08
09
09
10
10
11
11
01
01
02
02
03
03
04
04
05
05
06
06
07
07
08
08
HPR-02-A2-H1L0_Schaltplan_Katalog_v01
Projekt-Name:
Projekt-Titel:
Dokument -Titel:
Dokument-Name:
Dokument-Ers teller:
Zuletzt gespeichert:
Projekt-Ersteller:
Erstellt am :
Schaltplan_H1L
RA3 - P.Schlee
RA3 - P.Schlee
16.03.2012 14:42:37
16.03.2012 15:02:35
0 m ax
T
P
LU
X
A
LS1
LS2
D1
P
A
TX
H1L
P1
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).
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.
H1L-controller