DESCRIPTION
The MCV105C Electrical Displacement Control (EDC) is a
two-stage electrohydraulic pump stroke control which uses
mechanical feedback to establish closed loop control of the
swashplate angle of Danfoss 46 cc Medium Duty
Pumps.
The first stage is a MCV116A torque-motor actuated, double-
nozzle flapper valve that produces a differential output
pressure proportional to the applied electrical signal. The
second stage uses the differential pressure to drive its
double spool arrangement and port oil to the pump servo
pistons. The second-stage rotary spool configuration allows
a null deadband (for machine safety) in the pump’s output
while maintaining optimum dynamic response to control
commands.
•
Single command source can be used to control both
hydrostatic pump and motor.
•
Servo control deadband independent of signal null
deadband: offers safety combined with accurate and
responsive control.
•
Resistance to the environment: silicone oil filled torque
motor prevents moisture condensation, environmentally
sealed first/second stage interface, full environmental
testing.
•
Minimum long term null shift.
•
Pilot supply screens in series. Upstream screen is
externally serviceable.
•
Plugged first stage orifice will not drive pump towards full
stroke.
•
First and second stages can be individually replaced in
the field.
•
Single or dual coil torque motor.
FEATURES
The standard EDC is a single coil (one input to the torque
motor) Packard connector device. The first option is a dual
coil, which allows two command sources to be compared at
the torque motor, the resulting signal being the algebraic sum
between the two. Connectors are the second connector
option available. Dual pilot coils are available with both
connector types. See Wiring, page 8.
All MCV105C orifices will be provided through
Danfoss, Ames, Iowa.
Order the EDC either factory installed on pumps or as an
individual control.
Order replacement parts through Danfoss,
Minneapolis, MN. See Table C and D - Service Parts , page
3 to 4, for item number, part number and description
correspondence.
MCV105C directly replaces MCV105B. The MCV105C
housing is designed to firmly maintain the O-rings while
mounting. All MCV105C models are factory shipped with O-
rings installed, while the MCV105Bs were not. See Table C
ORDERING INFORMATION
TABLE A - INFORMATION NECESSARY TO SPECIFY
THE EDC.
PILOT STYLE
DESCRIPTION
Single coil, 23 ohm,
22
Packard Weather Pack connector
Dual coil,
23
Packard Weather Pack connector
Single coil, 23 ohm
26
MS connector
Dual coil, 23 ohm
27
MS connector
Single coil, 643 ohm,
46
Packard Weather Pack connector
MCV105C 3 0
XX
STANDARD EDC CASTING
PILOT STYLE
- Service Parts, page 3, for the appropriate installation kit if
required.
MCV105C
Electrical Displacement Control - MDT
© Danfoss, 2014-05
11152452 • Rev AA • May 2014
1