nireco servojet sj2 · the epc system automatically controls the edges of a product (strip) for...

NIRECO SERVOJET SJ2

General..................................................................................1

Features ..............................................................................1

Structure .............................................................................2

Manifold Controller ..............................................................3

External Dimensions ...........................................................5

Model Codes .......................................................................6

Applications of NIRECO Servojet ........................................7

GENERALThe NIRECO Servojet is an industrial servo valve for converting electric signals (-200 to 0 to＋+200mA DC) into hydraulic signals, which is used mainly for EPC® in iron and steel plants. The NIRECO Servojet uses a highly reliable jet pipe system with extensive experience of use to ensure high operability and easy maintenance.

�A dry detecting unit that is not affected by magnetic dust in oil reduces periodic maintenance work.

�A jet pipe system with extensive experience of use provides hydraulic control.

�A servo mechanism for handling low to high flowrates is available in combination with a variety of gain boosters.

�A wide range of gain boosters is available with hydraulic pressures of 0.8 to 14MPa.

�A simple structure allows for disassembly, reassembly, and adjustment in your plant.

Easy operation and maintenance.

�The amount of oil used by the jet pipe has been approximately halved compared to conventional models.

　Contents

　FEATURES

EPC is a registered trade mark of Nireco Corporation and stands for Edge

Position Control. The EPC system automatically controls the edges of a

product (strip) for uniform alignment in rolling, heat treatment, pickling,

and surface treatment processes for thick and thin plates.

Applications of the EPC technology include the Center Position Control

(CPC) system for centering control and the Line Follower Control (LFC)

system for line or mark follow-up control used in various industries.

2

STRUCTURE

500 100

Moving coil

Bias spring

Gain booster

Return oil

Hydraulic supply

Gain adjusting knob

Jet pipe

Oil chamber

Detecting chamber(dry type)

Hydraulic supply for jet pipe

Intermediate pieceSetting signal

Jet pipe

Work cylinder

Spool withdistributor block

Control action signal

High hydraulicpressure supply forgain booster

Drain

Gain booster

Gain adjusting knob(for setting non-linearcharacteristics)

Drain

Seal diaphragm

Set spring(compression spring)

Bias spring(tension spring)

Work cylinder

Permanent magnet

Inlet of hydraulic fluid,fulcrum

Fig. 1 Operating Principle of Servojet Controller Fig. 2 Conceptual Diagram of Hydraulic Controller

Gain BoosterHydraulic fluid supplied from the inlet is introduced into the jet pipe, and is discharged from the jet pipe nozzle toward the distributor block. The recovery pressures at both sides of the gain booster are balanced when the jet pipe nozzle faces the area mid-way between the two orifices of the distributor block.When the jet pipe moves to either side, the oil pressure at one side of the gain booster rises and the oil pressure at the other side falls. As a result, a differential pressure is generated between the two detecting units of the gain booster. This differential oil pressure changes the amount of the main oil needed to move the work cylinder piston. Thus, the amount of oil supplied to the work cylinder is proportional to change in the input signal.

Specifications of a Single NIRECO Servojet Controller

Fig.3 shows the characteristics of the gain booster. The 0% gain shows a dead zone, which is a characteristic found in pilot valves. The 100% gain shows a linear characteristic, and any gain between them shows a non-linear characteristic. This non-linear characteristic is im-portant to improve the stability of the EPC system.

100%

100%

100%

100%

Flow

Displacementof jet pipe

00

GAIN 1

00%

GAIN 5

0%

GA

IN 0

%

Fig. 3 Flowrate Characteristics of Gain Booster (Gain Adjustment)

ControllerThe NIRECO Servojet controller consists of a moving coil detecting element, a jet pipe control unit whose sides are supported by special bearings, a spring acting against the detecting element through the jet pipe, and a zero-point adjusting unit with bias adjusting springs.The moving coil detecting element consisting a moving coil and a permanent magnet generates a force in proportion to a current according to Fleming's rule when an input current is applied to the moving coil in a magnetic field. This relation can be expressed by the following formula.

Relation between input and output signals:F＝ 6.5√W＝ 6.5√R・1where, F＝ output(N) W＝ input power(W) I＝ current of moving coil(A) R＝ resistance of moving coil(Ω)

This force counteracts that of the spring on the opposite side of the jet pipe. Thus, the jet pipe moves to a position where the force generated by the input current is balanced by the spring's force.

Input signal: +200 to 0 to -200mA DC (zero balance)

Resistance of moving coil: About 20Ω

Supply oil pressure: 1.2MPa

Jet pipe capacity*: About 3.5ℓ/min (at 1.2MPa)

Hysteresis error: Less than 2％

Fluctuation of neutral point: Less than 2％

*: For gain boosters with a 1.2-mm diameter nozzle

3

MANIFOLD CONTROLLER M4SJ240, M5SJ240, M6SJ240The manifold controller consists of a NIRECO Servojet controller, which receives a strip edge position signal from the sensors as an electric signal and converts it into hydraulic pressure (amount of oil); an adjustable gain booster, which ampli f ies the hydraul ic signal; an automatic shut-off valve (solenoid controlled valve), which is automatically shut from a remote place; a reducing valve, which adjusts the hydraulic supply pressure to the NIRECO Servojet controller; and an oil pressure gauge. These components are integrated into a manifold equipped with special hydraulic circuits.

Specifications of Manifold Controller

+10

-10

-20

Gai

n(d

B)

01 2 3 4 5 20

Pha

se(d

egre

e)

-0-10

-20

-30

-40

-50

-60

-70

-80

-90

Hydraulic pressure of jet pipe:

1.2MPa

Temperature of oil: 40 to 45 C゚

Input:±25%(±1V),sine wave)

Phase 12Hz（-45°）

Gain 19Hz(−3db)

50 Hz0.5 10

Fig. 4 Characteristic Curve of NIRECO Servojet Controller

Gai

n(d

B)

+10

-10

0.5 1 2 3 4 5 10 20 50

Pha

se(d

egre

e)

0

-20

-40

-60

-80

-100

-120

-20

0

Hydraulic pressure of jet pipe:1.2MPaTemperature of oil: 40 to 45C゚Input:±50%(±2V),sine wave)

-3db

-45゜

Fig. 5 Characteristic Curve of NIRECO Servojet Controller with Gain Booster

Photo 1 M4SJ240

Photo 2 M5SJ240

Photo 3 M6SJ240

Model of manifold controller M4SJ240 M5SJ240 M6SJ240

Gain Booster BO9M BO9HM BO10M

Maximum hydraulicpressure MPa 5 14 10

Flow-rate characteristics: Fig. 7 Fig. 9 Fig. 11

Mass kg: About 23 About 28 About 48

Hydraulic pressure of jet pipe 1.2MPa

Permissible back pressureof return oil 0.1MPa

4

Manifold M4

Manifold M5

Manifold M6

M4SJ240

AB

P T

T P

Reducing valve

Reducing valve

Reducing valve

Gain booster

Gain booster

Gain booster

Automaticshutoff valve



NIRECO Servojet controller


Pre

ssur

e Io

ss M

Pa

Pre

ssur

e Io

ss M

Pa

Pre

ssur

e Io

ss M

Pa

Oil pressure gaugefor jet pipe



To cylinder

Return oil

Return oil

To cylinder Return oil

12

Returnoil

550 100 150200 (mA)

4

3

2

1

0.5

10

50

50 100 150 200 (mA)

54

3

2

1

10

54

3

2

1

0.50.4

0.3

0.2

0.110 20 30 40 50 100 200 300 400 500

0.55 10 20 30 40 50 100 200

10 20 30

Flow-rate( /min)

Flow-rate( /min)

Flow-rate( /min)40 50 100

BAGain booster:BO9MGain:100%

T P

AB

2 1

M5SJ240

BA

T

P T

P T

P

B A

2 1

M6SJ240

Hydraulicsupply

Hydraulicsupply

Hydraulicsupply

BA

Gain booster:BO9HMGain:100%

Gain booster:BO10MGain:100%

×

×

×

100150 (mA)200


M4SJ240, M5SJ240, M6SJ240

Fig.6 Hydraulic Circuit Diagram of M4SJ240 Fig.7 Flow-rate Characteristics of M4SJ240



Note: The flow-rate characteristics of integrated manifold controllers are shown.

5

G1/2 conduit connection portAutomatic shutoff valve

145

17520 10

4-M8×15

62 97159

295

35 40

455

MAX83

40

1 2

35130205

370

1104-M10×15

Rc3/4 return oilconnection port

180

12.5

130

6990

14.5

14.5

12.5

95

88

Input signal connectorCable diameter 8 max.

JIS 210K-20(SSA)hydraulic supplyconnection port

Pressure gauge forhydraulic supply(depending on spec.)

Pressure gaugefor jet pipe

Servojet SJ240

Rc1/4 drain port

2-JIS 210K-20(SSA)Cylinder connection ports①,②

Gain booster


6525

1070

10

60

Servojet SJ 240




2-JIS 210K-15(SSA)Cylinder connectionports①,②

Rc1/2 drain port.


NIRECO

Rc1/2 hydraulic supplyconnection port

62 28

90

52

475

275

MAX.67 76

57 38 65 46

205320

2 30 45

281

EXTERNAL DIMENSIONS

Fig.12 Manifold Controller M4SJ240 (Dwg.No.AG3724.1-EA)


6

67325

4-M12×20

Rc1 return oil connection port

170

12.5

8111

4

12.5

20

15

125 130

22515

655548

0

2 1

45170

Rc1/4drain port

Gain booster

2-JIS 210K-25(SSA)Cylinder connection port①,②


40180255

515195

11481


Pressure gauge forhydraulic supply(depending on spec.)


Servojet SJ240

JIS 210K-25(SSA)Hydraulic supply connection port

150


MODEL CODES

MO

DE

L

Modelof

manifold

Max hydraulicpressure

[MPa]

Flow rate☆ 1

[ℓ / min]Gain booster

combined

(none) ― ― ―

M4 5 32 BO9M

M5 14 80 (48)☆ 2 BO9HM

M6 10 200 BO10M

SJ2

4

0 Mineral

Types of hydraulic

fluid

1 Phosphate - ester ☆ 3

2 Water - glycol ☆ 3

3 Fatty acid ester ☆ 3

ー

A 100V 50/60Hz, 110V 60Hz

Power supply for

solenoid valve

C 200V 50/60Hz, 220V 60Hz

P 110V 50Hz

Q 220V 50Hz

D DC 12V

E DC 24V

F DC 48V

G DC 100V

N Not providedLock circuit

1 Provided

1 M4 5MPa

Pressure of hydraulic supply

2

M5

~5MPa

3 5~10MPa

4 10~14MPa

5M6

~5MPa

6 5~10MPa

N Not provided Hydraulic pressure gauge1 Provided

N Not providedThrottle

check valve1 Provided

N Not providedStand

1 Provided

N Not providedOil sump

1 Provided

N Not providedTerminal box

1 Provided

Notes ☆ 1 The values for flow-rate are for the case in which the pressure loss is

half the maximum hydraulic pressure.

☆ 2 This value is the case where the pressure loss at 48 r/min is 2.5 MPa

☆ 3 Specify the manufacturer and brand of hydralic fluid to be used.

7

APPLICATIONS OF NIRECO SERVOJET

Autowide sensor

Work cylinder

Return oil

Analog positiontransmitter

Amplifier

Manual operation switch

Servojet

Hydraulicsupply

Work cylinder

Return oil

Analog positiontransmitter

Amplifier

Photohead

Manual operation switch

Servojet

Hydraulic supply

Work cylinder

Linear sensor

Analog position transmitter

Digital controller

Return oil

Servojet

Hydraulicsupply

1. Payoff reel system (unwinder)

2. Steering roller system (intermediate guide roller)

3. Tension reel system (winding reel)

Fig.15

Fig.16

Fig.17

QI0206.5-E May 2014 Printed in Japan

Hachioji Office2951-4, Ishikawa-machi, HachiojiTokyo, 192-8522 JapanTEL. +81-42-660-7353FAX. +81-42-660-7354

We reserve the right to change the specifications in this catalog without prior notice to improve and update our products.

http://www.nireco.com E-mail : [email protected]

NIRECO CORPORATION

nireco servojet sj2 · the epc system automatically controls the edges of a product (strip) for...

Documents