Bosch Rexroth 4WS2EM 10 Series Manuale utente

Explosion-proof

hydraulic valves

Type 4WS2EM 10...VH1...-100

Operating instructions

RA 29583-VH1-100-B0/05.12

Replaces: 05.10

Material Number

R901272980

1/14

Servo directional control valve

of 4-way design

Type 4WS2EM...VH1...-100

Nominal size 10

Unit series 5X

Maximum working pressure 315 bar

Maximum flow rate 180 l/min

RA 29583-VH1-100-B1/05.12

Replaces: 05.10

Information on explosion protection:

Ranges of application in accordance with Article 505, NEC ®

– IS Class I, Zone 0, AEx ia IIC T4

– NI Class I, Zone 2

– Ambient temperature range –20 °C ≤ Ta ≤ +60 °C

For potentially explosive atmospheres

Part I Technical Data Sheet

What you need to know about these Operating Instructions

These Operating Instructions apply to the explosion-proof version of Rexroth valves,

and consist of the following three parts:

Part I Technical Data Sheet RA 29583-VH1-100-B1

Part II Product-specific Instructions RA 29583-VH1-100-B2

Part III Control drawing RA 29583-VH1-100-B3

You can find further information on the correct handling of Rexroth hydraulic products in our publication

“General product information for hydraulic products”, RE 07008.

RA 29583-VH1-100-B0

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2/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1

Overview of Contents

Contents Page

Features 2

Ordering data and scope of delivery 3

Symbol 3

Function, sectional diagram 4

Technical data 5 and 6

Information on explosion protection 6

External trigger electronics 6

Plug-in connector 7

Electrical connection 7

Characteristic curves 8 to 11

Unit dimensions 12

Flushing plate 13

Features

– Servo directional control valve for proper use in potentially

explosive atmospheres of Zone 0

– Valve for closed-loop position, force and speed control

– 2-Stage servo valve with mechanical feedback

– 1st stage in the form of flapper nozzle amplifier

– For subplate mounting,

Mounting hole configuration to

ISO 4401-05-05-0-05 with ports X and Y.

Subplates, see page 12

– Dry servo motor, no contamination of solenoid gaps by

pressure fluid

– Non-wearing spool return element

– Actuation:

External trigger electronics in modular form, additional

safety barriers (order separately), see Page 6

– Valve is calibrated and tested

– Internal/external control oil supply and return individually

orderable

– Spool with flow force compensation

– Control sleeve permanently centered, therefore reducing

sensitivity to temperature and pressure

– Pressure chamber gaps on control sleeve sealed,

no wear to O-rings

– Filter for 1st stage freely accessible from the outside

Hydraulics Bosch Rexroth AG

RA 29583-VH1-100-B1 4WS2EM...VH1...-100 3/14

Ordering data and scope of delivery

Symbol

1) Nominal flow rate

The nominal flow is based on a 100 % setpoint signal at a

valve pressure drop of 70 bar (35 bar per metering edge).

The flow can be affected by other values.

A possible nominal flow tolerance of ± 10 % (see flow sig-

nal function on page 8) must be taken into consideration.

2) Electrical triggering data

The control signal must be generated by a current-regulat-

ed output stage with superimposed dither signal. For trigger

electronics (servo amplifiers), see page 6.

3) Control oil

The pilot pressure should be kept as constant as possible.

Therefore, external pilot control via port X can be advanta-

geous. The valve may be operated with higher pressure at

X than at P, to increase the dynamics.

Note:

Ports X and Y are also subject to pressure when the

supply and return of control oil are “internal”.

4) Supply pressure range

The system pressure should be kept as constant as pos-

sible.

Pilot pressure range: 10 ... 210 bar or 10 ... 315 bar.

With regard to the dynamics, the dependence on the

frequency response must be taken into account within the

permitted pressure range.

5) Spool overlap

The spool overlap is stated in % of the control spool stroke.

6) Non-standard version number “100”

When not actuated (power off), channel P → B and A → T

are open 10 % of the nominal flow.

Electrically operated

2-stage servo valve,

4-way version

for external = 4WS2E

trigger electronics

Mechanical feedback = M

Nominal size 10 = 10

Unit series 50 to 59 = 5X

(50 to 59: installation and connection

dimensions unchanged)

Nominal flow 1)

5 l/min = 5

10 l/min = 10

20 l/min = 20

30 l/min = 30

45 l/min = 45

60 l/min = 60

75 l/min = 75

90 l/min = 90

Valves for external trigger electronics:

Coil No. 11 (30 mA/85 Ω per coil) 2)

= 11

100 = Special

numbers 6)

V = FKM seals 6)

suitable for mineral oil

(HL, HLP) to DIN 51524

Spool overlap 5)

C = 3 … 5 % positive

D = 0 … 0,5 % positive

E = 0 … 0,5 %

negative

Electrical connection

K31 = with plug

to EN175201-804

Plug-in connector – order separately

see Page 7

Supply pressure range to 1st stage 4)

210 = 10 … 210 bar

315 = 10 … 315 bar

Control oil supply and discharge 3)

– = External supply, external return

E = Internal supply, external return

T = External supply, internal return

ET = Internals supply, internal return

(ET = Standard version)

VH1 = Valve in explosion-proof design

For details, see information on explosion protection,

Page 6

4WS2E M 10 5X B 11 VH1 K31 V 100

Included in scope of delivery:

– Valve operating instructions

– Valve fastening screws

a, b

4/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1

Function, sectional diagram

4WS2EM...VH1...-100

Valves of this type are electrically operated, 2-stage servo

directional control valves with a mounting hole configuration

to ISO 4401-05-05-0-05. They are predominantly employed

for closed-loop position, force and speed control.

These valves consist of an electro-mechanical converter

(torque

motor) (1), a hydraulic amplifier (flapper nozzle princi-

ple) (2) and a control spool (3) in a sleeve (2nd stage), which

is connected to the torque motor via a mechanical feedback.

An electrical input signal at the coils (4) of the torque motor

causes a permanent magnet to generate a force that acts on

the armature (5) and, acting by means of a torque tube (6),

this force generates a torque. This torque then moves the

flapper plate (7) - which is connected to the torque tube (6) by

a rod - out of its central position between the two control ori-

fices (8), resulting in a pressure drop at the end faces of the

control spool. This pressure drop causes the position of the

spool to change, so that the pressure port is connected to one

consumer port and, at the same time, the other consumer

port is connected to the return port. In this special version

”100” the valve is trimmed about 10% from P → B and A → T.

The control spool is connected to the flapper plate or the

torque motor by a feedback spring (mechanical feedback) (9).

The position of the spool continues to change until the return

torque through the feedback spring and the electro-magnet-

ic torque of the torque motor reach a state of equilibrium, and

the pressure drop at the flapper nozzle system becomes zero.

In this way, the stroke of the control spool and thus the flow of

the servo valve are closed-loop-controlled proportionately to

the electrical input signal. At the same time, it should be noted

that the flow is dependent on the valve pressure drop.

External trigger electronics (order separately)

The valve is actuated by external trigger electronics (a servo

amplifier), which amplifies an analog input signal (setpoint) so

that the controlled-current output signal is capable of driving

the servo valve.

Type 4WS2EM...VH1...-100

Hydraulics Bosch Rexroth AG

RA 29583-VH1-100-B1 4WS2EM...VH1...-100 5/14

Technical data

General

Mounting hole configuration ISO 4401-05-05-0-05

Installation position Optional (ensure that pilot control is certain to receive

sufficient pressure (≥10 bar) when starting

up the system!)

Surface protection Valve body, cover and filter screw Nitrocarburized

Cap Anodized

Storage temperature range °C –20 … +70

Ambient temperature range °C –20 … +60

Weight kg 3.56

Hydraulic

Working Control oil supply pilot stage bar 10 … 210 or 10 … 315

pressure: Main valve, ports P, A, B bar up to 315

Return pressure: Port T

Internal control oil return bar Pressure peaks < 100 permitted

External control oil return bar up to 315

Port Y bar Pressure peaks < 100 permitted, static < 10

Pressure fluid Mineral oil (HL, HLP) to DIN 51524, other pressure fluids

available on request, ignition temperature > 150 °C

Pressure fluid temperature range °C –15 … +60, preferably +40 … +50

Viscosity range mm2/s 15 … 380, preferably 30 … 45

Maximum permissible degree of contamination of

pressure fluid Purity class to ISO 4406 (c) Class 18/16/13 1)

Zero flow qV,L 2) with spool overlap E

measured without dither signal l/min

pP 4) L

70bar min

•

0.7 pP 4) L

70bar min

•

0.9 pP 4) L

70bar min

•

1.2 pP 4) L

70bar min

•

1.5 pP 4) L

70bar min

•

1.7

Nominal flow qv nom 3), Tolerance ±10%

at valve pressure drop ∆p = 70 bar

(35 bar per edge)

l/min 5 10 20 30 45 60 75 90

Max. possible control spool stroke based on

mechanical end position (in case of fault) referred

to nominal stroke

% 120 … 170 120 … 150

Return system mechanically

Hysteresis (dither optimized) % ≤ 1.5

Range of inversion (dither optimized) % ≤ 0.3

Response sensitivity (dither optimized) % ≤ 0.2

Pressure gain with 1 % spool stroke

variation (starting from hydr. zero) % of pP ≥ 30 ≥ 60 ≥ 80

Zero adjustment flow

over entire working pressure range % ≤ 3, long-term ≤ 5

Zero offset on variation of:

Pressure fluid temperature

% / 20 K

≤ 1

Ambient temperature

% / 20 K

≤ 1

Working pressure 80 … 120 % of pP

% / 100 bar

≤ 2

Return pressure 0 … 10 % of pP 4) % / bar ≤ 1

1) The purity classes stated for the components must be com-

plied with in hydraulic systems. Effective filtration prevents

problems and also extends the service life of components.

For a selection of filters, see www.boschrexroth.com/filter.

2) qV,L = zero flow in l/min

3) qv nom = nominal flow in l/min

4) pP = working pressure in bar

6/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1

Electrical

Degree of protection of valve to EN 60529 IP 65 with correctly mounted and secured plug-in connector

Type of signal analog

Nominal current per coil mA 30

Resistance per coil Ω 85

Inductance at 60 Hz and

100 % nominal current: Connection in parallel H 0.25

In case of actuation using non-Rexroth amplifiers, we recommend a superimposed dither signal

Technical data

Type test certification FM Approved

Range of application to according

Article 505, NEC ®

IS Class I, Zone 0, AEx ia IIC T4

NI Class I, Zone 2

Ambient temperature range °C –20 … +60

Pressure fluid temperature range °C –15 … +60

Valve is only supplied with power from

certified, intrinsically safe circuits

with the following maximum values

Umax V 9.3

Imax mA 390

Pmax mW 907

Conditions for use in Zone 0 The valve cap consists of cast aluminium.

When the valve is to be used as a Category 1 device in Zone

0, the valve cap must be protected in such a manner that no

ignitable sparks from friction, impact or grinding can be pro-

duced, even in the event of rarely occurring malfunctions.

Note:

The hydraulic fluid used must have an ignition temperature of

at least 150 °C.

Required free space for burst protection The specified free space for burst protection (see Page 12)

must remain free, in order that excess pressure occurring in

the event of a fault can be dissipated through the plug in the

valve cap.

Additional requirements for use in zone 0 Safety barrier required

Additional requirements for use in zone 2 May be used without safety barrier

Information on explosion protection

Servo amplifier 1) in modular design Analog Typ VT 11021 as per Technical Data Sheet RE 29743

Recommended safety barrier 1) Single-

channel Messrs. Stahl, Type 9001/02-093-390-101

Note:

The servo amplifier and safety barrier must be operated outside the potentially explosive atmosphere!

External trigger electronics

1) Order separately

ADB

n.c.

PA PA

ADB

n.c.

Hydraulics Bosch Rexroth AG

RA 29583-VH1-100-B1 4WS2EM...VH1...-100 7/14

Zone 0 Amplifier Safety barrier Valve: Coil A Coil B

Non-hazardous Hazardous atmosphere

atmosphere

Ø8…Ø13,5

Plug-in connector

Plug-in connector to EN 175201-804

Metal version

Order separately under Material No. R900223890

Safety barrier required

Note

Only approved cables and leads may be used for intrinsically

safe circuits.

The Entity Concept allows interconnection of intrinsically safe

apparatus with associated apparatus not specifically exam-

ined in combination as system when:

Vmax > Voc or Vt ; Imax > Isc or It ; Ca > Ci + Ccable;

La > Li + Lcabel

Control equipment connected to barrier must not use or

generate more than 250 Vrms or Vdc.

The configuration of associated apparatus must be

FM Approved.

Electrical connection

The electrical connection may only be connected in parallel.

The electrical actuation with positive (+) to A and B and negative (–) to C and D produces a volumetric flow direction of P → A

and B → T. Inverse electrical actuation produces a volumetric flow direction of P → B and A → T.

Pins E, F and PE on the plug are not connected.

Zone 2 Amplifier Valve: Coil A Coil B

Non-hazardous Hazardous atmosphere

atmosphere

Safety barrier not neccesary

100

200

3020

10 70

40 200 300

100

8/14 Bosch Rexroth AG Hydraulics 4WS2EM...VH1...-100 RA 29583-VH1-100-B1

Characteristic curves (measured with HLP 32, ϑoil = 40 °C ± 5 °C)

Order

code

Nominal flow

Curve

5 5 l/min 1

10 10 l/min 2

20 20 l/min 3

30 30 l/min 4

45 45 l/min 5

60 60 l/min 6

75 75 l/min 7

90 90 l/min 8

Flow - load function (tolerance ± 10 %) with 100 % setpoint signal

Note:

Observe flow values in the max. setpoint range (see tolerance zone of flow signal function)

Tolerance zone of flow signal function

at a constant metering edge pressure drop

Flow in l/min →

100

–20–40–60–80

4020 60 80

110

–100

100

110

P → A; B → T

P → B; A → T

Flow rate in %

Setpoint in %

Typical flow

curve

Tolerance

zone

∆p = valve pressure drop

(supply pressure pP minus

load pressure pL and

minus return pressure pT)

Valve pressure drop in bar →

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