Danfoss MCV109A Installation guide

DESCRIPTION

The MCV109A Electrical Displacement Control (EDC-MV) is a two-stage electrohydraulic motor stroke control which uses mechanical feedback to establish closed loop control of the swashplate angle of Danfoss Series 2X and Series 3X motors.

The first stage, the MCV116 Pressure Control Pilot, is a 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 motor servo cylinders.

MCV109A

Electrical Displacement Control-MV

BLN-95-8985-1 Issued: June 1995

FEATURES

• 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: standard silicone oil filled torque motor, environmentally sealed first/second stage interface, full environmental testing.

• Pilot supply screens in series, upstream screen is externally serviceable

• First and second stages can be individually replaced

• Swashplate movement can be visually detected

• Single or dual coil torque motor

ORDERING INFORMATION

MCV109s are ordered for the particular motor on which they are to be mounted. Link Installation Kits, as ordered in the table below, include: orifices, retaining ring, drag link, spacer plate, swashplate pin, link and ball assembly, hex screws, Orings and gaskets. In some cases not all the above are necessary for installation and they are not included in the kit.

TABLE A. INFORMATION NECESSARY TO SPECIFY THE LINK INSTALLATION KIT.

KK041 XX

MOTOR SERIES

Order the valve itself through the following table:

TABLE B. INFORMATION NECESSARY TO SPECIFY THE ELECTRICAL DISPLACMENT CONTROL.

MCV109A59 XX

PILOT STYLE

The EDC Pilot comes in five styles:

PILOT STYLE DESCRIPTION

22 Single Coil, Packard Connector

23 Dual Coil, Packard Connector

26 Single Coil, MS Connector

27 Dual Coil, MS Connector

The standard EDC Pilot is a single coil (one input to the torque motor) (see Block Diagram), silicone oil filled, Packard Connector device. The options are a dual coil, which allows two command sources to be combined at the torque motor, the resulting signal being the difference between the two, a MS3102C14S-2P (Danfoss Part Number K01314) connector.

ORDERING INFORMATION

1234567890

ITEM PART ITEM PART

NUMBER NUMBER DESCRIPTION NUMBER NUMBER DESCRIPTION

1 K03383 Mating Connector 2-Pin (Unassembled) 14 K07028 Plug

K03384 Mating Connector 4-Pin (Unassembled) K07011 O-Ring For Item 14

2 K03377 Device Connector 2-Pin (Unassembled) 15 K07163 Spacer - Size 20

K03378 Device Connector 4-Pin (Unassembled) 16 K07164 Spacer - Size 26

3 K01314 Device MS Connector 17 K07128 (3) Port Screens

4 K08106 Mating MS Connector (90°) 18 K07136 (2) .052 Orifices

5 K07055 #10-32 X 5/8 Socket Head Cap Screw 19 K07006 (3) O-Ring For Ports

6 K01291 (2) Plugs 20 K07182 EDC Gasket

7 K07612 Filter Assembly 21 K07160 Linkage Bushing

8 K07034 (2) Screws, Null Adjust Cover K07009 O-Ring, Linkage Bushing (1 Each)

9 K08387 Seal Washer 22 K02611 Snap Ring

10 K10911 Seal Washer Retainer 23 K04448 Plug

11 K07000 #3/8-32 Nut Null Adjust 24 K07159 Plug

12 K08133 Gasket Null Adjust Cover K07010 O-Ring For Item 15

13 K07158 Null Adjust Cover 25 K07005 O-Ring Linkage Shaft

26 CAUTION

Do Not Remove (4) Cover Screws

1238E

BLN-95-8985-1

SPARE PARTS

(continued)

See the Spare Parts diagram for a list of spare parts available for the MCV109A. Other non-standard spare parts, such as orifices, may be available upon request.

Order Danfoss Pressure Override Valve through

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SPARE PARTS

Order the EDC either factory installed on motors or as an individual control.

TECHNICAL DATA

WARNING

When using a pulse width modulated valve driver, do not use a carrier frequency between 200 and 600 Hz. If these frequencies cannot be avoided, consult the factory. Do not use a pulse current of more than 120% of that required for full output. Failure to meet the above conditions can cause severe damage to the valve which will result in improper system operation.

CONNECTION DIAGRAM

Pin Orientation of the Optional MS Connector, Part Number (K01314) MS3102C14S-2P.

See Performance Curve and Wiring Schemes diagrams.

The device is capable of operating continuously at 125%

of rated current at 104° C (220° F) oil temperatures.

COIL IMPEDANCE

23 ohms (single coil) 19 ohms (A, B terminals) and

15.5 ohms (C, D terminals) (dual coil)

HYSTERESIS

4 mA (.85 degrees swashplate angle) maximum at .01 Hz

LINEARITY

10% maximum of swashplate change between any two points

PHASING

A positive voltage applied to Terminal B (Red lead) will cause a pressure rise at the C2 port

SENSITIVITY

The valve shall respond to a 2% change in input current throughout the rated current range

1276

D C

A B

ELECTRICAL

THRESHOLD/RATED OUTPUT CURRENT

The current required to come off stroke (threshold) and

to reach full 6° destroke (rated output) will be per the

following table.

FINAL TWO DIGITS THRESHOLD RATED OUTPUT

OF EDC PART # SETTING CURRENT

22 or 26 85 mA 140 mA (±10%) 23 or 27 125 mA 185 mA (±10%)

HYDRAULIC

FLUID

Automatic transmission fluid or hydraulic oil, such as Mobil DTE 24 or equivalent

FILTRATION

The system hydraulics shall have 10 micron or better filtration

CASE PROOF PRESSURE

500 psi at 121° C (250° F)

CASE PRESSURE WITH NO EXTERNAL LEAKAGE

200 psi, minimum

RATED CASE OPERATING PRESSURE

40 psi

RATED FLOW

1.15 minimum to 1.45 maximum gpm (standard device)

1.50 minimum gpm (high response) with cylinder ports connected and 200 psi supply pressure

HYSTERESIS

4 mA maximum at .01 Hz

OPERATING SUPPLY PRESSURE

215 psi above case pressure

MAXIMUM NULL LEAKAGE

.65 gpm (standard)

1.25 gpm (high response) at 200 psi across the valve with oil of 145-160 SUS at

38° C (100° F)

BLN-95-8985-1

WIRING DIAGRAM (Typical)

B C

Single coil 140 mA with 3.3 Vdc input at full destroke.

Using one of the two dual coils, 185 mA with 2.8 Vdc (C, D) or

3.6 Vdc (A, B) input at full destroke.

Dual coils in series, 72 mA with 4.4 Vdc input at full destroke.

Dual coils in parallel, 185 mA with 1.4 Vdc input at full destroke.

-V

GROUND

MCH CONTROL HANDLE

MCV104

EDC

PV MV

MCV109

EDC

B A

SWASHPLATE ANGLE (DEGREES)

OUTPUT CURRENT (mA)

100 200

03, 04, 07, 08 11 01, 02, 05, 06

PERFORMANCE CURVE

1444

WIRING SCHEMES

Current vs. Swashplate Angle for the MCV109. Legend References the Last Two Digits of the Part Number.

BLN-95-8985-1

1446A

Wiring Schemes Using Four Different Pilot Valve Configurations for the EDC. Input Voltages Specified at 24° C.

1447

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