Page 25 - Linde - HPR-02 Self regulating pump for open loop operation

Controllers. H1L. Load Sensing with hydraulic override
01 02 03 04 05 06 07 08 09 10 11
In addition to the load sensing function, HPR-02 pumps with H1L-controller offer the possibility of overriding the ∆p LS-signal
01 hydraulically. This enables either a so called mode control for selecting different operation points or establish a power limit regula- 01
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
H1L
resulting hydraulic signal of the first controller and follows the first pump’s actions (master-slave-configuration).
02 02

A
LS2
03 LS1 03
D1
P1
X
P
04 P A X T 04

0 max
05 05

T U L
06 06
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.
07 07

Projekt-Name: HPR-02-A2-H1L0_Schaltplan_Katalog_v01
Projekt-Titel:
Dokument-Name: Schaltplan_H1L
08 Dokument-Titel: RA3 - P.Schlee 08
Projekt-Ersteller:
∆p LS-reduction H1L-controller 16.03.2012 14:42:37
Dokument-Ersteller:
RA3 - P.Schlee
Erstellt am:
Zuletzt gespeichert: 16.03.2012 15:02:35
01 02 03 04 05 06 07 08 09 10 11
4
3
∆p LS [bar] 2 1

0 5 10 15 20 25 30
Pilot pressure pstA [bar]

1 16 bar ∆p setting
2 20 bar ∆p setting
3 25 bar ∆p setting
4 28 bar ∆p setting

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