Danfoss 51 Series Service Manual

Speed sensor location SAE / DIN flange motors
Speed sensor
Magnetic ring
Piston
P100 200E
The SAE and DIN flange motors use a flat end speed sensor. Cartridge flange motors use a conical end
speed sensor.
Controls
Overview
There are three basic categories of controls available for Series 51 and Series 51-1:
•
Two-position controls
•
Pressure -compensator controls
•
Proportional controls (Series 51 only)
Two-position controls
Two-position controls shift the motor to only two discrete positions:
•
maximum displacement
•
minimum displacement.
Control input may be either by hydraulic or electrical signal. To change motor displacement, the control
routes pilot pressure to one end of the servo piston while draining the other. Series 51-1 controls may
direct pilot pressure to both ends of the servo simultaneously, allowing the differential area of the piston
to stroke the motor to minimum angle.
Some two-position controls are available with a Pressure Compensator OverRide (PCOR) feature.
The PCOR feature allows normal 2-position control while causing the motor to increase displacement
when system pressure reaches a set level due to load. The pressure compensator portion of the control
overrides the minimum displacement position commanded by the control input signal. PCOR controls
are available with brake pressure defeat to prevent the pressure compensator from operating during
dynamic braking.
Complete functional description, maintenance, and repair procedures for 2-position controls are covered
in detail in these supplements to this manual:
•
11009442 Series 51 Hydraulic and Electrohydraulic Two-position Controls
Types: N2, HZ, E1-E2, F1-F2, G1-G2, S1
Service Manual
Series 51 and 51-1 Motors
Operation
©
Danfoss | March 2016 11008567 | AX00000013en-US0202 | 17

Danfoss 51 Series Specifications

General

Brand	Danfoss
Model	51 Series
Category	Engine
Language	English