Ep, Eq, Er, Es Controls; Operation; General Description - Danfoss 51 Series Service Manual

Service Manual

EP, EQ, ER, ES Controls

Operation

Series 51 Electrohydraulic Proportional Controls Service Manual

General Description

The EP, EQ, ER, ES controls consist of a ported housing mounted on the multifunction block. The ported
housing has a piston and a pushpin that contact the 4-way valve. A pressure control pilot (PCP) is
mounted on the control housing.
The PCP produces a differential output pressure. It's proportional to the applied electrical input signal.
Differential pressure is fed to the piston ends. When differential pressure reaches the preset threshold
force on the piston it causes the 4-way valve to move and port servo supply pressure to the servo piston.
This changes the motor's displacement.
The EP and ER controls have Packard connectors. The EQ and ES controls have MS connectors.The EP and
EQ controls have external supply pressure to X1 port.The ER and ES controls have internal supply
pressure from the multiblock.
EP, EQ, ER, ES
F32
M38
M32
M44A4
M42
M1 (PCP)
M12
11009448 • Rev BA • July 2014
F324
M28
M24
M30
M36
M32
M32A
Valve housing
M44
M42A
M26
M16
M14
M18
P101 939
33