A7, L1, L2, L7 Controls; Operation; General Description; Proportional Solenoid - Danfoss 51 Series Service Manual

Service Manual

A7, L1, L2, L7 Controls

Operation

Series 51 Electrohydraulic Proportional Controls Service Manual

General Description

The A7, L1, L2, L7 controls consist of a ported housing mounted directly on the end cap. It contains a
check valve. A direct acting proportional solenoid, with a pushpin, is mounted onto the housing. This
solenoid is high-current. It has an input range of 440 to 1290 mA (12V) or 220 to 645 mA (24v). These
controls are not available with pressure compensator override.

Proportional Solenoid

The proportional solenoid, through the pushpin, presses directly against the 4‑way valve. With signal
current below the threshold setting, the motor defaults to maximum displacement. An increase in signal
current above the threshold setting, shifts motor displacement steplessly from maximum to minimum.
Connector Oder Code
Order code
A7
L1
L2
L7

Check Valve

The check valve resolves which system port (A or B) is higher pressure. It routes this higher pressure to
the 4-way valve, as servo supply pressure, to power the servo piston.
11009448 • Rev BA • July 2014
Volts Connector
12v AMP Junior Timer
12v DIN
24v DIN
12v AMP Junior Timer
19