Application examples

COMMON SPECIFICATIONSPRP Series PRP-2

Input signal
Power input: Stepping motor
Motor: Potentiometer
Position detection: Provided
Manual control: 4-20 mA DC
Position output
Operating temperature : -20 to +55°C (Standard type),
5 to 70°C (Lloyd's Register approved type)Vibration: 2 G (19.6 m/s2) (Standard type),∙ Acceleration
0.7G (6.9 m/s2) (Lloyd's Register approved type): 4-20 mA DC or 1-5 V DC
: 100-120 V AC (Not selectablefor CE)
200-240 V AC
Protection level : IP66
Wiring conduit : G 1/2 (two)Standard Type

Lloyd's Register Approved(Environmental categories ENV3)

Maximum torque

600 N∙mModel : PRP-0x

IP66

Model: PRP-1x

IP66

Model : PRP-0xx-x/LR

IP66

Model: PRP-1xx-x/LR

IP66

Operational Angle

90°

Max. Torque

100 N∙m

200 N∙m

Operation Time(90°)

12 seconds (PRP-01)
24 seconds (PRP-03)
8.5 to 125 seconds (PRP-00)

16 seconds (PRP-11)
24 seconds (PRP-13)
16 to 125 seconds (PRP-10)

WeightApprox. 10.8 kg (approx. 12.1 kg with failsafe function option)

Resolution

1/200 (deadband set to 0.5 %), 1/1000 (deadband set to 0.1 %)· Contact us for network capability.

EXTERNAL DIMENSIONS unit: mm (inch)
312 [12.28][171 [6.73]]
141 [5.55]

174 [6.85](75 [2.95])

EC-4823

Ideal for Basis Weight Control
39 44[1.54] [1.73]

61[2.40]

156 [6.14]

146 [5.75]

50.1[1.97]

2024-01

High Performance Electric Actuator for Stock ValvePRP SERIES SPECIFICATIONS(257 [10.12])

Space requiredfor battery maintenance[171 [6.73]]

Battery box cover

50.1[1.97]

312 [12.28]
141 [5.55](162 [6.38])

134 [5.28]

61 [2.40]55 [2.17]

Rotary Motion Electric Actuator

Model: PRP
Maximum torque1[.04]

122 [4.80](196[7.72])
61[2.40]

156 [6.14]

Failsafe function

146 [5.75]

93[3.66]

100N∙mYour local representative:

Stock Valve

Maximum torque200N∙mWebsiteModel: PRP-0
Model: PRP-1

Request Info

MG CO., LTD.
(formerly M-System Co., Ltd.)
www.mgco.jp

Specifications are subject to change without notice. When ordering, use the latest data sheets available at our web site: www.mgco.jp

MG CO., LTD.
(formerly M-System Co., Ltd.)
www.mgco.jp
5004884-2009Rev.

1Stopping
Stoppingatatthe
thetarget
targetposition
positionwithout
withoutovershooting
overshooting

Actuator
Actuator Mechanism
Mechanism Ensuring
Ensuring
HighHigh Precision
Precision Control
Control ofof Stock
Stock Valves
ValvesHigh
Highresolution
resolution&&precision
precision
Micro-processor
Micro-processorbased
basedElectronic
ElectronicMotor
MotorDriver
DriverCircuit
Circuit
Precisely
Preciselytracking
trackingtarget
targetposition
positionbybyfeedback
feedbackcontrol
controlinincombination
combination
withwithpredictive
predictivecontrol
controlHigh
HighPrecision
PrecisionPosition
PositionSensor
SensorHightorquetorqueHigh
1/1000highhighresolution
resolution
1/1000BackupBackupbattery
battery(option)(option)Micro-processor
Micro-processorbased
based
control
controlcircuit
circuitboard
board

Indicator
Indicator

Stepping
SteppingMotor
Motor
Motor
Motorrotation
rotationcontrol
controlresolution
resolution
ofof1.8
1.8degrees
degreesper
perpulse
pulse
See
SeePage
Page77High
Highprecision
precisiontorquetorquecontrol
control

3-step3-stepReduction
ReductionGear
GearMechanism
Mechanism
High
Highprecision
precisiongear
gearsystemsystemwithwithminimum
minimumbacklash
backlash
AllAllshafts
shaftsarearesupported
supportedwith
withballballbearings.
bearings.

Worm
Worm

WormWormwheel
wheel

ManualManualcontrol
controlshaft
shaft(hexagon(hexagonsocket)
socket)Terminal
Terminalcover
coverCompactlydesigned
designed
Compactly

Worm
WormGear
GearMechanism
Mechanism

Image
Image
withwithfailsafe
failsafefunctionfunction
optionoptionRotaryRotaryMotion
MotionElectricElectricActuator
Actuator

PRP
PRPSeries
SeriesMaximum
MaximumtorquetorqueMaximum
MaximumtorquetorqueModel:PRP-0
PRP-0
100
100N∙mN∙m Model:

200
200N∙mN∙m Model:
Model:PRP-1
PRP-1

High
Highreduction
reductionratio
ratio
despitedespitethe
thecompact
compactsize
size

OutputOutputshaftshaft

Four
Fourreasonsreasonswhy
whythethePRP
PRPisisideal
idealforforbasis
basisweightweightcontrol
control

Stock
StockValve
Valve
V-portV-portball
ballvalves
valvesarearetypically
typicallyused.
used.

Valve
Valveopening
openingcontrol
controlinin1/1000
1/1000high
highresolution.
resolution.
Excellent
Excellentrepeatability
repeatabilityand
andlinearity
linearityofofpositioning.
positioning.
Opening/closing
Opening/closingspeed
speedprogrammableprogrammableininconjunction
conjunctionwith
withthetheB/M
B/Mcontrol
controlsystemsystem(16(16toto999
999seconds
secondsper
perfullfullspan)span)totoadapt
adaptwithwithdesign
designspeed
speedchanges
changesofofthe
thepaperpapermachine.
machine.
The
Theactuator
actuatormass
masssignificantly
significantlyreduced
reducedfrom
fromconventional
conventionalones
onesthanks
thankstotothe
thehigh-torquehigh-torquedesign
designisisconvenientconvenientas
asreplacement.
replacement.

2233

APPLICATION EXAMPLEINSTALLATION EFFECTS

Multilayer Paperboard Machine

The following positive effects have been observed byintroducing the PRP for a stock valve.

PRP Series

Flowmeter

Overall cost ≈1/3WO

Calculation of the overall cost is based on an actual project in Japan, including
the net cost of a replacement of the existing actuator, a control panel andinstallation fee.
Consult us for detailed information.

LPFLPU

Delivery leadtime ≈1/9
Delivering a replacement of the existing actuator typically takes 9 months.
1 month will suffice for delivery of the PRP.

Yoke

Weight (mass) ≈1/10

Valve

PICTURE 1

Electric Actuator PRP Series connected to the bottom-layer pulpstock valve in the multilayer paperboard
machine, with an electromagnetic flowmeter measuring pulp flow.

Mass of the old actuator and the PRP is compared in the images below.
(In this project, the valve was also replaced.)

PRP

PRPzeizeSieSallrg

Sm

La

Flowmeter

LPPUOW

FLYokeCouplingValvePICTURE 2

The PRP is easily adaptable with future design speed changes of the paper machine thanks tothe opening/closing speed which is programmable in conjunction with the B/M control system.

4FLO

PRP connected to the top-layer pulpstock valve

LPAFTERPU

BEFOREW

PICTURE 3Valve

Closeup of Picture 1: PRP

5

STEPPING MOTORPULPSTOCK CONTROLSYSTEM CONFIGURATIONA stepping motor generates a torque ≈10 times higher
than an induction motor does.
The stepping-motor-driven actuator, PRP Series, is most suitable for operating stock valves that require highresolution, good linearity and high torque control ability.

Onsite Panel

The PRP is significantly smaller compared to conventional actuators using induction motors.
Rotary Motion
Electric Actuator
PRP

Manual Loader
STL

Position Setpoint

Dry Contact

4-20 mA DC

1.2

StatorClose Command
Dry Contact

Phase ASTEPPING MOTOR

1.0Rotor
Phase B

Position Setting
MXCB

4-20 mA DC

torque [N∙m]

Position FeedbackTORQUE COMPARISON TO AN INDUCTION MOTOR

Phase A

B/M : Basis weight and Moisture content

0.60.40.2

Stock Valve(V-port ball valve)

Phase B

Shaft

0500

1000

INDUCTION MOTOR

1500

Decreased withclose command ON

2000

2500

3000

3500

4000

rotating speed [rpm]2-phase/8-pole motor

RELATION BETWEEN POSITIONING COMMAND AND SETPOINT SIGNAL
Increased with
open command ON

0.8

10 TIMES HIGHER

B/M
Control
SystemOpen Command

MECHANISM

A stepping motor rotates by a constant angle per pulse.

Position setpoint
Analog output

A stepping motor, also called a pulse motor, is a motor that rotates in synchronization with a command pulse
signal. The principle of rotation of a simplified 2-phase, 8-pole stepping motor model is shown in the figure below.
ONOpen command
Contact input

OFFClose command
Contact input

OFFON

time

ON

A stepping motor consists of a stator with windings and a rotor using a powerful neodymium magnet. Energizing
the stator windings to generate a magnetic force is called excitation. By sequentially exciting the multiple statorwindings based on the command pulse, the motor rotates stepwise, utilizing the action of attraction and repulsion
between the magnetic poles of the stator and rotor.
The rotation angle of a stepping motor is always determined by the constant mechanical accuracy (motorstructure and machining accuracy) for each command pulse signal. Therefore, a stepping motor performs highly
accurate positioning control.

The above diagram shows the control scheme of a stock valve operating system.
In the automatic operating mode, the B/M control system provides open and close contact command signals tothe MXCB which increases/decreases the analog output signal proportionally to the ON time duration of therespective contact signals. They are provided from the manual loader STL in case of manual operating mode.
The analog output accuracy is approximately 0.1%. The PRP actuator is able to control the valve with 1/1000
resolution. The combination of these devices ensures the precise basis weight control.

NS

Stator

SS

Rotor

Rotor

(Permanent magnet)(Permanent magnet)

The valve position signal is fed back to the B/M control system to quickly eliminate errors.
The travel time of an entire span (open from/to close) is programmable between 16 to 999 seconds depending
upon the parameter combinations of the PRP and the MXCB.

6

StatorNS7