Danfoss MCV104A Installation guide

MCV104A

Electrical Displacement Control

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.

-

pressure proportional to the applied electrical signal. The
second stage uses the
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.

erential pressure to drive its double

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.

K07116

•
stroke.

• First and second stages can be individually replaced.

• Swashplate movement can be visually detected.

Issued: November 2003

•

interface, full environmental testing.

• Minimum long term null shift.

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

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

• Single or dual coil torque motor.

• 4 to 20 mA control option.

• Intrinsically safe control option for hazardous atmosperic
environments.

TABLE A. INFORMATION NECESSARY TO SPECIFY
THE EDC

MCV104A

DEVICE IDENTITY

CONFIGURATION

SERIES*

PILOT STYLE

*

in the series slot for the control’s order number; A “9” indicates
a generic control.

X 9 XX

is to be mounted. This in turn determines the components of
the mounting kit, including the appropriate link.

© 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

CODE

1
2
3
4
5
6
7
8

* Pressure Override Only

PRESSURE
OVERRIDE

Yes
Yes

No

Yes
Yes

HIGH

RESPONSE

Yes

Yes

No

Yes

Yes

SERVO
PORTS

Yes
Yes
Yes
Yes

No

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.

PRODUCT TYPE

KIT TYPE

PUMP SERIES

KK

04

XXX

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

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

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

9 Any Pump, Less Linkage

The model code is “9”.

PILOT STYLE

MODEL DESCRIPTION

22

DESCRIPTION

PRODUCT TYPE

The model code is "04".

KIT TYPE

­ MODEL CODE DESCRIPTION

1 Standard EDC

2 EDC with POR

-

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.

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
tween the two. Dual coil models can be connected in parallel or

© Danfoss, 2013

SPARE PARTS

See the Spare Parts Section of this book for a
available for the MCV104. Other non-standard spare parts, such

Order Sauer-Dan foss Pre ssure O verride Valve throug h
Sauer-Danfoss, Ames, IA [phone] or Sauer-Danfoss
Distributors.

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

erence be-

K07116 • Rev AB • September 2013

list of

spare parts

2

SPARE PARTS

1 - 2 3 - 4

5

29

6

7

30 - 32

8

9

10

11

12

27 - 28

13

14

15 - 16

26

36 - 42

ITEM PART ITEM PART

NUMBER NUMBER (QUANTITY) DESCRIPTION NUMBER NUMBER (QUANTITY) DESCRIPTION

1 K03383 (1) Mating Connector 2-Pin (Unassembled) 22 K07182 (1) EDC Gasket

2 K03384 (1) Mating Connector 4-Pin (Unassembled) 23 K07160 (1) Linkage Bushing

3 K03377 (1) Device Connector 2-Pin (Unassembled) 24 K07009 (1) O-Ring, (1) Linkage Bushing

4 K03378 (1) Device Connector 4-Pin (Unassembled) 25 K02611 (1) Snap Ring

5 K08106 (1) Bag Assembly (Mating Connector) 26 K04448 (1) Plug

6 K07055 (4) #10-24 X 5/8 Socket Head Cap Screw 27 K07159 (1) Plug

7 K01291 (2) Plug 28 K07010 (1) O-Ring for Item 27

8 K22582 (1) Filter Assembly 29 CAUTIO N (4) Do Not Remove Cover Screws

9 K07034 (2) Screw, Neutral Adjust Cover 30 K02361 (1) Piston Pack 14-85 mA

10 K08387 (1) Seal Washer 31 K15631 (1) Piston Pack 4-20 mA

11 K10911 (1) Seal Washer Retainer 32 K07008 (1) O-Ring Piston Pack

12 K07000 (1) #3/8-32 Nut, Neutral Adjust Lock 33 K07005 (1) O-Ring Link Shaft

13 K08133 (1) Gasket Neutral Adjust Cover 34 K07151 (1) Spool Standard

14 K07158 (1) Neutral Adjust Cover 35 K07150 (1) Spool High Response

15 K07028 (1) Plug 36 K03272 (1) Link & Ball Assembly, 20 Frame

16 K07011 (1) O-Ring For Item 15 37 K03273 (1) Link & Ball Assembly, 21/22 Frame

17 K07163 (1) Spacer - SS 20 38 K03274 (1) Link & Ball Assembly, 23 Frame

18 K07164 (1) Spacer - SS 26 39 K03275 (1) Link & Ball Assembly, 24 Frame

19 K07128 (3) Port Screens 40 K03276 (1) Link & Ball Assembly, 25 Frame

20 K07136 41 K03277 (1) Link & Ball Assembly, 26 Frame

21 K07006 (3) O-Ring For Ports 42 K03278 (1) Link & Ball Assembly, 27 Frame

25

33

23 - 24

34 - 35

17 - 22

1238F

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.

Service Parts List.

ITEM P/N QTY DESCRIPTION

1 K01291 2 SAE-6 Plugs
2 K07067 4 PCP Mounting Screws
3 K02264 4 PCP Cover Screws
4 K26275 1 3/8-24 PCP Null Access Screw

K00920 1 1/4-28 PCP Null Access Screw
5 K28475 1 PCP Cover Kit
6 K21436 1 Silicone Oil Kit 4000 cs
7 K04790 1 Connector O-ring
8 K08687 4 Connector Screw for MS
9 K01314 1 Connector MS

10 K08688 4 Connector Screw for Packard
11 K08106 1 Mating Electrical Connector MS
12 K08014 1 Feed Through Assy Cover Plate
13 K07533 1 Feed Through Assy 4-pin Packard W-P

K24223 1 Feed Through Assy 4-pin Deutsch

14 K03384 1 Mating Electrical Packard W-P 4-pin

K23511 1 Mating Electrical Deutsch 4-pin

15 K00829 2 O-ring Control Port
16 K00830 1 O-ring Return Port
17 K08573 1 Filter Assy with O-rings
18 K08493 1 O-ring Pressure Port

5

6

4

8

7

9

3

10

11

2

1

12

13

17

18

15

16

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

+A

+A

+A

CURRENT VS. SWASHPLATE ANGLE

ELECTRICAL

NOMINAL START CURRENT

18∞

15∞

± 11 mA (single coil)
± 16 mA (using one of the dual coils)
± 8 mA (using the dual coils in series)

10∞

± 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)

80 mA 60 mA 40 mA 20 mA

INPUT CURRENT (MA)

5∞

SWASHPLATE ANGLE (DEGREES)

20 mA 40 mA 60 mA 80 mA

5∞

62 ± 9 mA (using the dual coils in series)
125 ± 18 mA (using the dual coils in parallel)

10∞

18 ± 1.5 mA (low current models)
Current tolerances include ± 5 mA for single coil and ±

15∞

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)

Current Vs. Swashplate Angle for the MCV104A.
Single-Coil Load Pressure is 3000 PSI and Current Input is 0.01
Hz.

CONNECTION DIAGRAM

18∞

1141

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)

D

C

A

B

.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

Pin Orientation of 4-pin, 90° MS Mating Connector. Part
No. MS3108E-14 S-2S (Sauer-Danfoss Kit No. K08106).

1276

• 14 Vdc for dual coil models in series

• 7.5 Vdc for dual coil models when only one coil or both coils
in parallel are used

WIRING SCHEMES

• 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

use a pulse current of more than 120% of that required

not

for full output.

700

Ω

B

SINGLE COIL 20 MA
WITH 15 VDC
INPUT AT FULL STROKE.
(LOW CURRENT MODEL)

24

Ω

B

SINGLE COIL 85 MA
WITH 2.0 VDC
INPUT AT FULL STROKE.

HYDRAULIC

USING ONE OF THE TWO DUAL COILS

OIL VISCOSITY

40 - 6000 SSU

A

+

+

125 MA WITH 1.9 VDC (C, D COIL) OR

2.4 VDC (A, B COIL)
INPUT AT FULL STROKE.

A

19.5
Ω

B

+C

15.5
Ω

D

,

OIL TEMPERATURE

- 40° C (- 40° F) minimum
+ 104° C (+220° F) maximum continuous
+ 116° C (+240° F) maximum intermittent

B

C

35 Ω

(TOTAL

RESISTANCE)

B

C

9 Ω

(TOTAL

RESISTANCE)

AMBIENT OPERATING TEMPERATURE

- 40° to 93° C (- 40° to 200° F)

© Danfoss, 2013

D

DUAL COILS IN SERIES,
62 MA WITH 2.2 VDC
INPUT AT FULL STROKE.

K07116 • Rev AB • September 2013

D

DUAL COILS IN PARALLEL,
125 MA WITH 1.1 VDC
INPUT AT FULL STROKE.

1300

5