MCV104A
Electrical Displacement Control
K07116 |
Issued: November 2003 |
DESCRIPTION
The MCV104A Electrical Displacement Control (EDC) is a two-stage electrohydraulic pump stroke control which uses a mechanical feedback to establish closed-loop control of the swashplate angle of Sauer-Danfoss Series 2X and 3X pumps.
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pressure proportional to the applied electrical signal. The second stage uses the erential pressure to drive its double spool arrangement and port oil to the pump servocylinders. The sec
machine safety) in the pump’s output while maintaining optimum dynamic response to control commands.
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.
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interface, full environmental testing.
•Minimum long term null shift.
•Pilot supply screens in series, upstream screen is externally serviceable.
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stroke.
•First and second stages can be individually replaced.
•Swashplate movement can be visually detected.
•Single or dual coil torque motor.
•4 to 20 mA control option.
•Intrinsically safe control option for hazardous atmosperic environments.
ORDERING INFORM ATION
A range of options to the basic EDC allows it to be custom-tai-
each slot of the two order numbers, as shown in Tables A and B. Consult Sauer-Danfoss, Minneapolis, MN, with further questions.
Previous to September, 1985, Electrical Displacement Controls (EDC’s) and Hydraulic Displacement Controls (HDC’s) were sold with appropriate linkage assemblies installed for the various pump options. In order to simplify the inventory process, and thereby provide faster delivery to customers,this single ordering
number, as described further in the scheme outlined in Table A, remains the same - the only change being that a “9” is always
valve without linkage, allows the EDC or HDC to be mounted on any pump or motor. The second number to be included with the
is to be mounted. This in turn determines the components of the mounting kit, including the appropriate link.
TABLE A. INFORMATION NECESSARY TO SPECIFY THE EDC
MCV104A X 9 XX DEVICE IDENTITY 
CONFIGURATION
SERIES* PILOT STYLE
*
in the series slot for the control’s order number;A“9”indicates a generic control.
© Danfoss, 2013 |
K07116 • Rev AB • September 2013 |
1 |
ORDERING INFORMATION (continued)
DEVICE IDENTITY
This is the basic EDC. The model code is MCV104A.
CONFIGURATION
MODEL |
PRESSURE |
HIGH |
SERVO |
CODE |
OVERRIDE |
RESPONSE |
PORTS |
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1 |
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Yes |
2 |
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Yes |
Yes |
3 |
Yes |
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Yes |
4 |
Yes |
Yes |
Yes |
5 |
No |
No |
No |
6 |
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Yes |
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7 |
Yes |
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8 |
Yes |
Yes |
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* Pressure Override Only
The pressure override and pressure limiter accomplish the same function - they shift the pump swashplate toward neutral when system pressure exceeds a preset threshold. They thus limit maximum system pressure,protect components from heat
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power. Pressure override is available only for Series 2X pumps, and pressure limiting is available only for 3X pumps. Pressure limiting and annular control are not available together. If the model code chosen indicates that pressure override function is
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ration parameter, above). The pressure override valve must be obtained through Sauer-Danfoss,Ames,IA. The pressure limiting feature is inherent in the design of the MCV104 when applied with the 3X pump.
SERIES
MODEL |
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DESCRIPTION |
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9 |
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Any Pump, Less Linkage |
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The model code is “9”. |
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PILOT STYLE |
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MODEL |
DESCRIPTION |
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22 |
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23
26
27
40
(4-20 mA)
It may be preferred to apply the dual coil versus the single coil EDC.The dual coil allows two command sources to be combined at the torque motor,the resulting signal being the erence between the two. Dual coil models can be connected in parallel or
from condensing on the inside during extreme temperature changes. Dual coil valves have all four pin connections active. See the Wiring section.
TABLE B. INFORMATION NECESSARY TO SPECIFY THE KIT ASSEMBLY.
KK 04 X XX
PRODUCT TYPE
KIT TYPE
PUMP SERIES
PRODUCT TYPE
The model code is "04".
KIT TYPE
MODEL CODE |
DESCRIPTION |
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1 |
Standard EDC |
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2 |
EDC with POR |
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PUMP SERIES
20 - 27, 33, 34, or 36.
ring, drag link, spacer plate, swashplate pin, link and ball assembly, hex screws, O-rings and gaskets. In some cases not all the above are necessary for installation and they are not included in the kit.
Several Sauer-Danfoss variable pumps come without premounted controls. These pumps will need additional mounting hardware that generally accompanies the control in order to accomodate the EDC. The pump numbers are: 34-2035,34-2060, 34-2080, 36-2047, 36-2056, 36-2081, 36-2082.
If you wish to mount an EDC on one of these pumps, order a K07015 (9004700-1212) roll pin, a 9004875-0020 straight pin
and a 9340301 (for Series 34 pumps) or 9360354 (for Series 36 pumps) drag link.
SPARE PARTS
See the Spare Parts Section of this book for a list of spare parts available for the MCV104. Other non-standard spare parts,such
Order Sauer-Danfoss Pressure Override Valve through Sauer-Danfoss, Ames, IA (515) 239-6000 or Sauer-Danfoss Distributors.
Order the EDC either factory installed on pumps or as an individual control.
© Danfoss, 2013 |
K07116 • Rev AB • September 2013 |
2 |
SPARE PARTS
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1 - 2 |
3 - 4 |
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30 - 32 |
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8 |
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9 |
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10 |
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11 |
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27 - 28 |
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15 - 16 |
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26 |
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36 - 42 |
25 |
23 - 24 |
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17 - 22 |
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33 |
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34 - 35 |
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1238F |
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ITEM |
PART |
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ITEM |
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PART |
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NUMBER |
NUMBER |
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(QUANTITY) DESCRIPTION |
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NUMBER |
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NUMBER |
(QUANTITY) DESCRIPTION |
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1 |
K03383 |
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(1) Mating Connector 2-Pin (Unassembled) |
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22 |
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K07182 |
(1) EDC Gasket |
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2 |
K03384 |
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(1) Mating Connector 4-Pin (Unassembled) |
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23 |
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K07160 |
(1) Linkage Bushing |
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3 |
K03377 |
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(1) Device Connector 2-Pin (Unassembled) |
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24 |
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K07009 |
(1) O-Ring, (1) Linkage Bushing |
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4 |
K03378 |
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(1) Device Connector 4-Pin (Unassembled) |
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25 |
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K02611 |
(1) Snap Ring |
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5 |
K08106 |
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(1) Bag Assembly (Mating Connector) |
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26 |
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K04448 |
(1) Plug |
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6 |
K07055 |
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(4) #10-24 X 5/8 Socket Head Cap Screw |
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27 |
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K07159 |
(1) Plug |
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7 |
K01291 |
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(2) Plug |
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28 |
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K07010 |
(1) O-Ring for Item 27 |
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8 |
K22582 |
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(1) Filter Assembly |
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29 |
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CAUTIO N |
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(4) Do Not Remove Cover Screws |
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9 |
K07034 |
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(2) Screw, Neutral Adjust Cover |
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30 |
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K02361 |
(1) Piston Pack 14-85 mA |
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10 |
K08387 |
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(1) Seal Washer |
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31 |
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K15631 |
(1) Piston Pack 4-20 mA |
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11 |
K10911 |
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(1) Seal Washer Retainer |
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32 |
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K07008 |
(1) O-Ring Piston Pack |
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12 |
K07000 |
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(1) #3/8-32 Nut, Neutral Adjust Lock |
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33 |
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K07005 |
(1) O-Ring Link Shaft |
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13 |
K08133 |
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(1) Gasket Neutral Adjust Cover |
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34 |
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K07151 |
(1) Spool Standard |
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14 |
K07158 |
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(1) Neutral Adjust Cover |
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35 |
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K07150 |
(1) Spool High Response |
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15 |
K07028 |
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(1) Plug |
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36 |
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K03272 |
(1) Link & Ball Assembly, 20 Frame |
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16 |
K07011 |
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(1) O-Ring For Item 15 |
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37 |
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K03273 |
(1) Link & Ball Assembly, 21/22 Frame |
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17 |
K07163 |
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(1) Spacer - SS 20 |
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38 |
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K03274 |
(1) Link & Ball Assembly, 23 Frame |
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18 |
K07164 |
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(1) Spacer - SS 26 |
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39 |
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K03275 |
(1) Link & Ball Assembly, 24 Frame |
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19 |
K07128 |
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(3) Port Screens |
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40 |
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K03276 |
(1) Link & Ball Assembly, 25 Frame |
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20 |
K07136 |
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41 |
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K03277 |
(1) Link & Ball Assembly, 26 Frame |
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21 |
K07006 |
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(3) O-Ring For Ports |
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42 |
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K03278 |
(1) Link & Ball Assembly, 27 Frame |
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For items 17, 18, 20, 21, 22, 25 and 36-42 it is recommended to purchase the appropriate installation kit ensuring the necessary items for a complete EDC installation.
Item 30 is used for the 14-85 mA models.
Item 31 is used for the 4-20 mA models.
© Danfoss, 2013 |
K07116 • Rev AB • September 2013 |
3 |
SERVICE PARTS
WARNING
Regarding Service Parts List, Item 3:
DO NOT Remove Cover Screws unless replacing cover.
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Service Parts List. |
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ITEM |
P/N |
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QTY |
DESCRIPTION |
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1 |
K01291 |
2 |
SAE-6 Plugs |
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2 |
K07067 |
4 |
PCP Mounting Screws |
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3 |
K02264 |
4 |
PCP Cover Screws |
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4 |
K26275 |
1 |
3/8-24 PCP Null Access Screw |
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K00920 |
1 |
1/4-28 PCP Null Access Screw |
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5 |
K28475 |
1 |
PCP Cover Kit |
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6 |
K21436 |
1 |
Silicone Oil Kit 4000 cs |
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7 |
K04790 |
1 |
Connector O-ring |
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8 |
K08687 |
4 |
Connector Screw for MS |
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9 |
K01314 |
1 |
Connector MS |
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10 |
K08688 |
4 |
Connector Screw for Packard |
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11 |
K08106 |
1 |
Mating Electrical Connector MS |
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12 |
K08014 |
1 |
Feed Through Assy Cover Plate |
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13 |
K07533 |
1 |
Feed Through Assy 4-pin Packard W-P |
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K24223 |
1 |
Feed Through Assy 4-pin Deutsch |
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14 |
K03384 |
1 |
Mating Electrical Packard W-P 4-pin |
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K23511 |
1 |
Mating Electrical Deutsch 4-pin |
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15 |
K00829 |
2 |
O-ring Control Port |
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16 |
K00830 |
1 |
O-ring Return Port |
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17 |
K08573 |
1 |
Filter Assy with O-rings |
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18 |
K08493 |
1 |
O-ring Pressure Port |
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5 |
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7 |
8 |
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4 |
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9 |
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3 |
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10 |
11 |
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1 |
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12 |
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18 |
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13 |
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16 |
17 |
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15 |
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15
14
3001B
Note: The Deutsch electrical connectors are not shown. See Item 4, a change was made in January 2000 that increased the null See Item 5, the preferred part number K28475 includes the cover, gaskets, null access screw, and all the cover seals.
© Danfoss, 2013 |
K07116 • Rev AB • September 2013 |
4 |
TECHNICAL DATA
ELECTRICAL
NOMINAL START CURRENT
±11 mA (single coil)
±16 mA (using one of the dual coils)
±8 mA (using the dual coils in series)
±16 mA (using the dual coils in parallel)
±6.25 mA (low current models)
NOMINAL FULL STROKE CURRENT
(See Current vs. Swashplate Angle and Wiring Schemes) 85 ± 12 mA (single coil)
125 ± 18 mA (using one of the dual coils) 62 ± 9 mA (using the dual coils in series) 125 ± 18 mA (using the dual coils in parallel) 18 ± 1.5 mA (low current models)
Current tolerances include ± 5 mA for single coil and ±
pump series’. For sizing drive sources,use 100 mA in computations for single coil EDC’s.
COIL RESISTANCE @ 24° C (76° F) 23 ohms (single coil)
19.5 ohms (A, B Terminals),
15.5 ohms (C, D Terminals) (dual coil)
650 ohms (low current models)
COIL RESISTANCE @ 104° C (220° F) 29 ohms (single coil)
24.7 ohms (A, B Terminals),
19.7 ohms (C, D Terminals) (dual coil)
800 ohms (low current models)
COIL INDUCTANCE
.14 henries (single coil)
.062 henries (A, B Terminals),
.047 henries (C, D Terminals) (dual coil)
MAXIMUM CONTINUOUS VOLTAGE @ 93.3° C(200° F)
•7.5 Vdc for single coil models with the exceptionof those low current models
•14 Vdc for dual coil models in series
•7.5Vdc for dual coil models when only one coil or both coils in parallel are used
•24 Vdc for low curent models.
The EDC is designed to be controlled from a dc current source or voltage source. Pulse width modulation (PWM) is not required. But if a PWM signal is used, avoid a carrier frequency <200 Hz. Do not use a pulse current of more than 120% of that required for full output.
HYDRAULIC
OIL VISCOSITY
40 - 6000 SSU
OIL TEMPERATURE
- 40° C (- 40° F) minimum
+104° C (+220° F) maximum continuous
+116° C (+240° F) maximum intermittent
AMBIENT OPERATING TEMPERATURE - 40° to 93° C (- 40° to 200° F)
CURRENT VS. SWASHPLATE ANGLE
18∞
15∞ |
<![if ! IE]> <![endif]>(DEGREES) |
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10∞ |
<![if ! IE]> <![endif]>ANGLE |
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5∞ |
<![if ! IE]> <![endif]>SWASHPLATE |
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80 mA 60 mA |
40 mA 20 mA |
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INPUT CURRENT (MA) |
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20 mA 40 mA |
60 mA 80 mA |
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5∞ |
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10∞ |
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15∞ |
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18∞
1141
Current Vs. Swashplate Angle for the MCV104A.
Single-Coil Load Pressure is 3000 PSI and Current Input is 0.01 Hz.
CONNECTION DIAGRAM
D A
C B
1276
Pin Orientation of 4-pin, 90° MS Mating Connector. Part No. MS3108E-14S-2S (Sauer-Danfoss Kit No. K08106).
WIRING SCHEMES
+A |
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+A |
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+A |
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700 |
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24 |
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19.5 |
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Ω |
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Ω |
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Ω |
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B |
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B |
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B |
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SINGLE COIL 20 MA |
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SINGLE COIL 85 MA |
+C |
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15.5 |
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WITH 15 VDC |
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WITH 2.0 VDC |
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INPUT AT FULL STROKE. |
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INPUT AT FULL STROKE. |
Ω |
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(LOW CURRENT MODEL) |
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D |
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USING ONE OF THE TWO DUAL COILS, |
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125 MA WITH 1.9 VDC (C, D COIL) OR |
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2.4 VDC (A, B COIL) |
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INPUT AT FULL STROKE. |
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A |
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A |
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35 Ω |
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9 Ω |
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B |
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(TOTAL |
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B |
(TOTAL |
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RESISTANCE) |
RESISTANCE) |
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C |
C |
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D |
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DUAL COILS IN SERIES, |
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DUAL COILS IN PARALLEL, |
1300 |
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62 MA WITH 2.2 VDC |
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125 MA WITH 1.1 VDC |
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INPUT AT FULL STROKE. |
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INPUT AT FULL STROKE. |
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© Danfoss, 2013 |
K07116 • Rev AB • September 2013 |
5 |
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