1. General. 2. Mounting. D 7055 Electrical operation 2.1. May be utilized for the following directional spool valves:

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1 Solenoid actuations for directional spool valves For use with directional spool valves type SG and SP acc. to D 5650/1 directional spool valves bank type SKP, SKH and SKC acc. to D 7230 May be utilized for the following directional spool valves: Type Size Max. switchable pressure, (bar) Pamphlet with solenoid acc. to table 1 and 2, sect. 3 ME ME 2/... ME (D,U) 23/... MD MD 2/... ME (D,U) 3/... MU 2/... SG a. SP acc. to D 5650/1 SKP, SKH and SKC acc. to D and and (4) General The solenoid constitutes one of the most versatile modes of operation. Advantageous use in particular in hydraulic systems with successive cyclic movements of different consumers per work cycle (subsequent switching operations). The various kinds of control signals can be converted by appropriate command units into electrical signals and utilized as control commands: Manual Push button switch Dependent on path (position) Limit switch (contact switch) Dependent on pressure Pressure switching units, contact manometer Optical Photocells (with appropriate signal amplification), e.g. Iight barriers Thermal Temperature sensor, remote thermometer Mounting Single- or double-action solenoids can be used depending on the number of operating positions of the directional spool valve. The coil body (electrical section) is mounted on an armature pipe accommodating and guiding the armature. The armature is directly connected to the valve spool via a link rod (mechanical section). The armature pipe is pressure-sealed and externally closes off the pressurized return chamber 1) of the directional spool valve (necessary for series connections). Thus the armature is flushed with the return flow lubricating it (maintenance-free) and protecting it from ambient conditions (e.g. corrosion due to water of condensation). The moveable link rod does not require a seal, therefore no friction and the solenoid force can be completely employed. The coil body is sealed to the armature pipe via 0-rings at its face ends. The plug base together with the underlying winding connections are molded or integrated in the plastic jacket (dep. on solenoid size). Therefore both are protected from the penetration of corrosive moisture. Thus the solenoid is suited for outdoor use. Nevertheless installation in the splash area of the undercarriage or operating unit should be avoided with mobile applications. The solenoids can be exchanged at the installed directional spool valve. HAWE HYDRAULIK SE STREITFELDSTR MÜNCHEN D 7055 Electrical operation 1982 by HAWE Hydraulik November

2 D 7055 page 2 3. Types available, main data Directional spool valves (acc. to D 5650/1) Coding example: SG 3 G - MD 2/24... Table 3: Additional elements Coding without N L X Version Standard including plug, (with bridge rectifier in case of AC power supply) Version with manual emergency actuation Version with LED plug (only solenoids for 12 and 24V DC) Version without plug Flow pattern symbol for manual emergency actuation Table 2: Nominal voltage (electrical main data) Supply voltage U mains Uniform, without size different Differing codes when installed on directional spool valves size Voltage U nom Current 0 and 1 2, 3 and 5 (4) (V DC) I 20 (A) Nominal power P nom 7) Type Type ME MD, MU 45 W 60 W 150 W 65 W 12V DC /12 23/12 3/12 24V DC /24 23/24 3/24 42V DC /42 23/42 3/42 48V DC /48 23/48 3/48 60V DC Guide line 5 2/60 23/60 3/60 I 80V DC , 51 2/80 23/80 3/80 P nom / U nom 98V DC 98 2 ) 98 2 ) 61 2/98 23/98 3/98 110V DC /110 23/110 3/ V DC ) ) 7 2/180 23/180 3/ V DC ) /196 23/196 3/ V AC 50 Hz 98 5) 48 6 ) 81 2/110 W 23/110 W 3/110 W 230V AC 60 Hz ) 98 6 ) 8 2/230 W 23/230 W 3/230 W Isulation class H F H F } winding max. C Contact temperature approx. C at 20 C ambient temperature Table 1: Actuation mode Draw-in time approx. ms Decay time approx. ms Switching frequency / hour Rel. operating factor = (ED) at t cycle = 5 min S 1 S 1 S 3-35% S 1 (cycle time) (100% ED) (100% ED) (35% ED) (100% ED) Swith-off energy W A approx switching operations/hr 0.5 Ws ME... Single action MD... Double action MU... (spring return) for (spring return) for 3/2- and 4/2-way 3/3- and 4/3-way spool valves 1 ) spool valves a-position by permanent contact a- or b-position by permanent contact Not available for size 0 and 1! Reversal action (detent) for 3/2-and 4/2-way spool valves 1 ) a- or 0-position by 0.2 to 0.5 sec current pulse 1) Also for 3/3-and 4/3-way directional spool valves if only switching pos. 0-and -a are used, specify when ordering 2) For connection to power supply 110VAC 50/60 Hz via separate, customer- furnised bridge rectifier or plug conforming DIN (featuring a bridge rectifier ) 3) For connection to mains 200 VAC 50/60 Hz via separate, customer furnised bridge rectifier or plug conforming DIN (conturing a bridge rectifier) 4) For connection to mains 230 VAC 50/60 Hz via separate, customer furnised bridge rectifier or plug conforming DIN (conturing a bridge rectifier ) 5) With plug featuring a bridg rectifier see circuitry diagram 6) With plug featuring a dual half wave rectifier see circuitry diagram 7) Slight deviation from the nominal power P nom possible due to the used by the solenoid manufactures (so called wire jump)

3 D 7055 page Additional data Design Safety class Dwell times under pressure in switching position a or b for ME- or MD-solenoids (spring return) Switches pressure-sealed in oil IP 65 acc. to DIN VDE 0470/ EN 60529/IEC 529 (solenoid with properly installed plug ) The recommended values below should not be exceeded if possible to prevent seizing due to microfine dirt particles in the oil (edge filter effect). 300 bar $ sec The dwell times may be longer with fine filtration of the 250 bar $ sec hydraulic oil. 200 bar $ 5 min 150 bar $ 10 min Mass (weigth) approx. (kg) Suitable for directional spool valves Size 0 and 1 Size 2, 3 and 5 (4) ME... MD... ME 2/.. MD(U) 2/.. ME 3/.. MD 3/.. ME 23/.. MD(U) 23/.. MU 3/ Rel. operating factor (only approximate recommended values) rel. operating factor t r (% ED) at t s = 5 min ME(D) ME(D, U) 2/.. ME(D, U) 3/.. ME(D, U) 23/.. S 3-35% 5 min Ambient temperature ( C) Plugs and electrical symbols conforming DIN 43650, Single-acting solenoid: Solenoid Double- and reversal solenoid: Solenoid The specified plugs are automatically contained in the valve order coding. For other plugs featuring e. g. clamp diodes, economy circuits or LED s, see D 7163.

4 D 7055 page 4 4. Dimensions All dimensions are in mm, subject to change without notice! 4.1 Solenoids for directional spool valves 0 and 1 Type ME and MD Individual valve Single acting type ME... Double acting type MD... 1) 1) Valve banks For missing dimensions, see indiv. valves a = 28 for M..1 to for M..81 and Solenoids for directional spool valves size 2, 3 and 5(4) Type ME(D, U) 2/.. and ME(D, U) 23/.. Single acting type ME... Individual valve 1) 1) Double- and reversal acting type MD.. and MU.. For missing dimensions, see indiv. valves a = 28 for M..2(23)/12 to 2(23)/ for M..2(23)/110W and 2(23)/230 W 1) This dimension depends on the manufacturer and can be up to 40 mm (acc. to DIN 43650)

5 D 7055 page 5 Type ME 3/.., MD 3/.. and MU 3/.. Individual valves Single acting Double- and reversal acting type ME 3/... type MD 3/.. and MU 3/.. 1) 1) a = 28 for M..3/12 to M..3/ for M..3/110W and M..3/230W 1) This dimension depends on the manufacturer and can be up to 40 mm (acc. to DIN 43650) Valve banks For missing dimensions, see indiv. valves. Intermediate plates required for distance spacing (pay attention to the order terminology of the directional, spool valve bank) if solenoids are mounted on same side Only alternating mounting pattern possible for valve banks without intermed. plates 4.3 Emergency manual operation type M... N This section must be included in the instruction booklet or in the system operation manual 1. To use, insert the pin until the drop-in pin is felt, then turn until the pin has locked completely in the groove In operative position 2. Look for switching position 3. Disengage after use and pull to the stop (capstan again in inoperative position) M.. 1 to M.. 8 Unlock and pull up Pulled up M.. 2/.. M.. 23/.. M.. 3/.. Caution: The pin must be unlocked and pulled up at all costs to prevent malfunctions, especially when pressure is exerted at the return connection (series connection) of several valves. A feature unique to directional spool valve banks in an SKH series connection: Due to the reversal in flow direction in each even-numbered valve (refer to pamphlets 7230), the emergency manual operation of these valves can only be actuated with difficulty, if at all, at pressures greater than 40 to 50 bar. Hence, emergency manual operation in SKH directional spool valve banks is only possible in conjunction with baffle plates.