NIRECO SERVOJET SJ2

NIRECO SERVOJET SJ2
Contents
General.................................................................................. 1
Features...............................................................................1
Structure..............................................................................2
Manifold Controller...............................................................3
External Dimensions............................................................5
Model Codes........................................................................6
Applications of NIRECO Servojet.........................................7
GENERAL
The 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.
FEATURES
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.
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.
STRUCTURE
Controller
The 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 zeropoint 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・1
where,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.
Bias spring(tension spring)
Hydraulic supply for jet pipe
Set spring(compression spring)
Moving coil
Seal diaphragm
Permanent magnet
Detecting chamber(dry type)
Inlet of hydraulic fluid,
fulcrum
Setting signal
Control action signal
Oil chamber
Jet pipe
Jet pipe
Bias spring
Intermediate piece
High hydraulic
pressure supply for
gain booster
Spool with
distributor block
Drain
Drain
Hydraulic supply
Gain booster
0
50
100
Gain adjusting knob
Gain booster
Work cylinder
Work cylinder
Specifications of a Single NIRECO Servojet Controller
+200 to 0 to -200mA DC (zero balance)
Resistance of moving coil:
About 20 Ω
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
2
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 nonlinear characteristic. This non-linear characteristic is
im-portant to improve the stability of the EPC system.
10
0%
100%
N
AI
%
50
%
G
GA
IN 0
Hydraulic 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.
IN
Gain Booster
Fig. 2 Conceptual Diagram of Hydraulic Controller
GA
Fig. 1 Operating Principle of Servojet Controller
Input signal:
Gain adjusting knob
(for setting non-linear
characteristics)
Flow
Return oil
0
0 Displacement
of jet pipe
100%
100%
100%
Fig. 3 Flowrate Characteristics of Gain Booster (Gain Adjustment)
MANIFOLD CONTROLLER M4SJ240, M5SJ240, M6SJ240
The 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 amplifies the hydraulic 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
Model of manifold controller
M4SJ240
M5SJ240
M6SJ240
BO9M
BO9HM
BO10M
5
14
10
Gain Booster
Maximum hydraulic
pressure MPa
Flow-rate characteristics:
Mass kg:
Fig. 7
Fig. 9
Fig. 11
About 23
About 28
About 48
Hydraulic pressure of jet pipe
1.2MPa
Permissible back pressure
of return oil
0.1MPa
Photo 1 M4SJ240
+10
0
0.5
1
3 45
2
50 Hz
20
10
-0
-10
-20
Hydraulic pressure of jet pipe:
-20
Gain 19Hz(−3db)
1.2MPa
-40
-50
Temperature of oil: 40 to 45゜
C
-60
Input:±25%(±1V),sine wave)
Gain(dB)
-30
-70
Phase 12Hz（-45°）
-80
Fig. 4 Characteristic Curve of NIRECO Servojet Controller
Phase(degree)
-10
-90
Photo 2 M5SJ240
+10
0
0.5
1
2
3 4 5
10
20
50
0
-3db
-10
-20
-45゜
Gain(dB)
Hydraulic pressure of jet pipe:
1.2MPa
Temperature of oil: 40 to 45゜
C
Input:±50%(±2V),sine wave)
-40
-60
-80
Phase(degree)
-20
-100
-120
Fig. 5 Characteristic Curve of NIRECO Servojet Controller with Gain Booster
Photo 3 M6SJ240
3
M4SJ240, M5SJ240, M6SJ240
×
M4SJ240
Hydraulic
supply
NIRECO Servojet controller
Manifold M4
Oil pressure gauge
for jet pipe
50 100 150200 (mA)
5
4
Reducing valve
Return
oil
Gain booster P
T
A
B
A
Automatic
shutoff valve T
P
2
B
Gain booster:BO9M
Gain:100%
1
20
30 40 50
Flow-rate( /min)
10
Return oil
100
Fig.7 Flow-rate Characteristics of M4SJ240
NIRECO Servojet controller
Manifold M5
×
Hydraulic
supply
2
0.5
1
Fig.6 Hydraulic Circuit Diagram of M4SJ240
M5SJ240
Pressure Ioss MPa
3
Oil pressure gauge
for jet pipe
Reducing valve
100150200 (mA)
50
Gain booster
P
T
T
A
Pressure Ioss MPa
10
B
P
Automatic
shutoff valve B
0.5
10
5
4
3
B
Pressure Ioss MPa
T
P
20 30 40 50
Flow-rate( /min)
100
200
50 100 150 200 (mA)
10
Oil pressure gauge
for jet pipe
A
T
5
Fig.9 Flow-rate Characteristics of M5SJ240
NIRECO Servojet controller
Manifold M6
×
P
Gain booster:BO9HM
Gain:100%
Return oil
Reducing valve
Gain booster
2
A
Fig.8 Hydraulic Circuit Diagram of M5SJ240
Hydraulic
supply
3
1
2
1
To cylinder
M6SJ240
5
4
Gain booster:BO10M
Gain:100%
2
1
0.5
0.4
0.3
0.2
Automatic
shutoff valve B
A
1
2
To cylinder
0.1
10
Return oil
Fig.10 Hydraulic Circuit Diagram of M6SJ240
20
30 40 50
100
200 300 400 500
Flow-rate( /min)
Fig.11 Flow-rate Characteristics of M6SJ240
Note: The flow-rate characteristics of integrated manifold controllers are shown.
4
EXTERNAL DIMENSIONS
Servojet SJ 240
NIRECO
Rc1/2 return oil
connection port
Input signal connector
Cable diameter 8 max.
G1/2 conduit connection port
Automatic shutoff valve
62
90
275
Rc1/2 return oil
connection port
57
28
MAX.67
76
38
65
46
205
320
45
2
2-JIS 210K-15(SSA)
Cylinder connection
ports①,②
Rc1/2 hydraulic supply
connection port
60
65
10 70 10
25
145
30
52
Rc1/2 drain port.
281
475
Pressure gauge
for jet pipe
4-M8×15
175
20
Fig.12 Manifold Controller M4SJ240
(Dwg.No.AG3724.1-EA)
10
Servojet SJ240
Input signal connector
Cable diameter 8 max.
Pressure gauge for
hydraulic supply
(depending on spec.)
455
Rc1/4 drain port
2-JIS 210K-20(SSA)
Cylinder connection ports①,②
Pressure gauge
for jet pipe
97
159
295
40
130
35
205
370
MAX83
110
4-M10×15
88
95
14.5
90
130
69
JIS 210K-20(SSA)
hydraulic supply
connection port
G1/2 conduit connection port
Automatic shutoff valve
14.5
62
Gain booster
2
40
35
1
Rc3/4 return oil
connection port
180
12.5
12.5
Fig.13 M
anifold Controller M5SJ240
(Dwg.No.AG3725.1-EA)
5
Servojet SJ240
Input signal connector
Cable diameter 8 max.
Pressure gauge
for jet pipe
Pressure gauge for
hydraulic supply
(depending on spec.)
Rc1/4drain port
480
2-JIS 210K-25(SSA)
Cylinder connection port①,②
Gain booster
1
55
65
150
2
114
195
325
170
255
40
67
45
180
G1/2 conduit connection port
Automatic shutoff valve
515
JIS 210K-25(SSA)
Hydraulic supply connection port
125
4-M12×20
130
12.5
81
170
114
Rc1 return oil connection port
Fig.14 M
anifold Controller M6SJ240
(Dwg.No.AG3726.1-EA)
15
12.5
81
20
15
225
MODEL CODES
MODEL
Model
of
manifold
Max hydraulic
pressure
[MPa]
Flow rate ☆ 1
[ ℓ / min]
Gain booster
combined
N
Not provided
1
Provided
(none)
―
―
―
1
M4
M4
5
32
BO9M
2
M5
14
80 (48) ☆ 2
BO9HM
3
M6
10
200
BO10M
4
Lock circuit
~5MPa
M5
5~10MPa
10~14MPa
SJ24
5
Pressure of
hydraulic
supply
~5MPa
M6
0
Mineral
1
Phosphate - ester ☆ 3
2
Water - glycol ☆ 3
3
Fatty acid ester ☆ 3
6
Types of
hydraulic
fluid
ー
A
100V 50/60Hz, 110V 60Hz
C
200V 50/60Hz, 220V 60Hz
P
110V 50Hz
Q
220V 50Hz
D
DC 12V
E
DC 24V
F
DC 48V
G
6
5MPa
DC 100V
5~10MPa
N
Not provided
1
Provided
N
Not provided
1
Provided
N
Not provided
1
Provided
N
Not provided
1
Provided
N
Not provided
1
Provided
Hydraulic
pressure
gauge
Throttle
check valve
Stand
Oil sump
Power supply
for
solenoid valve
Terminal box
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.
APPLICATIONS OF NIRECO SERVOJET
1. Payoff reel system
(unwinder)
Amplifier
Autowide sensor
Hydraulic
supply
Manual operation switch
Analog position
transmitter
Servojet
Work cylinder
Fig.15
Return oil
Linear sensor
2. Steering roller system
(intermediate guide roller)
Analog position transmitter
Digital controller
Hydraulic
supply
Work
cylinder
Servojet
Return oil
3. Tension reel system
(winding reel)
Fig.16
Amplifier
Manual operation switch
Photohead
Servojet
Hydraulic supply
Analog position
transmitter
Work cylinder
Return oil
Fig.17
7
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 : info-process@nireco.co.jp
NIRECO CORPORATION
Hachioji Office
2951-4, Ishikawa-machi, Hachioji
Tokyo, 192-8522 Japan
TEL. +81-42-660-7353
FAX. +81-42-660-7354
QI0206.5-E
May 2014 Printed in Japan