M-system MSP4 User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 1 / 8
INSTRUCTION MANUAL
MINI-TOP ELECTRONIC ACTUATOR
(linear type) MODEL MSP4/MSP5/MSP6
BEFORE USE ....
Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■PACKAGE INCLUDES:
Mini-Top actuator unit........................................................(1)
2.5 mm Hexagon key wrench .............................................(1)
(For models with manual operation function; option /S)
The Mini-Top is not provided with a yoke or other compo-
nents required for mounting the unit to a valve. They are to
be provided by the user.
■MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
POINTS OF CAUTION
■CONFORMITY WITH EU DIRECTIVES
• This equipment is suitable for Pollution Degree 2 and
Measurement Category II (Full-open/-closed signal, tran-
sient voltage 1500V). Reinforced insulation (Full-open/-
closed signal to other, power or metallic housing: 125V) is
maintained. Prior to installation, check that the insula-
tion class of this unit satisfies the system requirements.
• Altitude up to 2000 meters.
• The equipment must be installed such that appropriate
clearance and creepage distances are maintained to con-
form to CE requirements. Failure to observe these re-
quirements may invalidate the CE conformance.
• Install lightning surge protectors for those wires connect-
ed to remote location. Refer to “LIGHTNING SURGE
PROTECTION” section below.
■POWER INPUT RATING & OPERATIONAL RANGE
• Locate the power input rating marked on the product and
confirm its operational range as indicated below:
100 – 120V AC rating: 90 – 132V, 47 – 66 Hz, approx. 25VA
200 – 240V AC rating: 180 – 264V, 47 – 66 Hz, approx. 25VA
24V AC rating: 24V AC±10%, 47 – 66 Hz, approx. 25VA (MSP6)
24V DC: 24V rating ±10%, approx. 0.6A
• Built-in power fuse: 250V/1A rating; time delay.
• A rush current 1.5 times as high as the above ratings can
flow at startup.
■GENERAL PRECAUTIONS
• Remove the power supply to the actuator before wiring.
■INSTALLATION
• Indoor, or outdoor where the MSP is NOT exposed to di-
rect sunlight
• Ambient temperature: -5 to +55°C (23 to 131°F)
• Operating humidity 30 to 85% RH (non-condensing)
• Vibration: 2 G (19.6 m/s2) max.
• Install the MSP where it can be reached for maintenance
and inspection. Be sure to allow at least 15 cm (6 inches)
clearance above the cover.
■OUTDOOR USE
• When installing the MSP outdoor or where it is exposed
to rain or water drops, be sure to fasten the cable connec-
tor tightly and give some slack to the cable.
• Do not mount the MSP in such a direction that the output
stem or cable connector faces upward.
Cable Connector
DO NOT Pull Tightly
■ELECTRICAL CONNECTION
• If the unit is a DC-powered model, power supply and sig-
nal lines are not isolated. Use an isolator, if needed.
• When wiring the unit using a cable longer than the
standard 1-meter cable equipped to the non-terminal box
model, use shielded cables for signal line, or install signal
cables in a separate duct/pipe from power supply cables.
■LIGHTNING SURGE PROTECTION
• In order to protect the unit from lightning surges enter-
ing through cables, use of appropriate lightning surge
protectors are recommended. For 24V DC power supply
line, choose a surge protector with its maximum surge
voltage 40V or less between lines.
Recommended M-System model: MDP-D24.
■PID CONTROLLER
• Choose PID parameters carefully so that the MV remains
as stable as possible. Unstable control shortens the life of
actuator and valve.
■O-RING, PACKING
• When replacing the actuator cover after adjustments,
check that the O-ring is securely placed in the groove.
• When replacing the terminal box cover, check that the
packing is properly applied.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 2 / 8
■YOKE DESIGN
• When a foreign object is caught in the valve, a thrust 4
times greater than the maximum rating could be gener-
ated. Leave enough strength for mechanical components
such as the yoke and the valve stem.
• If the MSP is used in an application such as temperature
control of a steam line, the temperature can rise higher
than the ambient temperature due to heat conducted or
radiated from the piping even when the ambient temper-
ature is within an allowable range.
Use a longer yoke to increase heat dissipation and apply
insulating material.
■AND ....
• DO NOT loosen the screw fixing the potentiometer lever.
Loosening it could cause a malfunction.
• DO NOT step onto the actuator.
• DO NOT allow a heavy object to rest on or against the
actuator.
PROTECTIVE FUNCTIONS
■OVERLOAD (LOCK) PROTECTION
The MSP is equipped with a protection circuit against over-
load caused by, for example, valve catching an alien sub-
stance.
When an overload is detected, the MSP stops supplying
power to the motor and the status LED blinks at 0.5 sec.
intervals.
The protection can be reset by applying an input signal to
move the output stem in the opposite direction, or turning
power off and restarting.
If the overload (lock) protection is activated too often, check
for the presence of foreign matter in the valve, inappropri-
ate adjustments, excessive tightening of the valve gland, or
other possible causes of the overload.
Be sure to remove the cause of overload in order to avoid
shortening the life of the product.
■FUSE
A fuse is equipped for protection against overload current.
Ensure that the power LED turns on as the power supply
is turned on. If the power LED remains off, check to see if
the fuse is melted. Replace the melted fuse with a new one.
If the new fuse is melted again soon after replacement,
there may be problems with the control PCB or the motor.
Consult M-System or sales representative.
■RESTARTING TIMER
The MSP is equipped with a timer circuit for setting a time
interval (0 – 10 sec.) between stop-restart actions to prevent
the motor and other internal components from overheating.
It is recommended to set the restarting timer longer when
the ambient temperature and/or the temperature of flow
material is high.
The restarting timer is factory-set to 1.5 sec.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 3 / 8
COMPONENT IDENTIFICATION
Power Input PCB (for AC power)
Insulation Barrier
Control PCB
Motor
Position Sensor
O-Ring
Cable Connector
Nut
Screw
Seal Spring
Output Stem
Cable
Figure 1. MSP4 & MSP5 Component Identication
Note: Construction of the MSP4 is partly different from the
above figure.
Figure 2-2. Long-life Potentiometer (MSP6)
Cable
Cable Connector
Nut
Screw
Seal Spring
Output Stem
Motor Power Input PCB (for AC power)
Potentiometer
Control PCB
Packing
Figure 2-1. MSP6 Component Identication
OFF
1
2
3
4
ON
PWR INP ALM
DLY
ZERO SPAN DZ
SW1
Insulation Sheet
Fuse
Connector
ZERO
SPAN
DZ
DLY
SW1
PWR
INP
ALM
: Zero Adjustment
: Span Adjustment
: Deadband Adjustment
: Restarting Timer
: Direct/Reverse Actions,
Operation at Abnormally Low Input
: Power Indicator (Green LED is ON while power is supplied)
: Input Indicator (Green LED is ON while normal signal is input)
: Status Indicator
(Red LED blinks at intervals of: 2 sec. in normal operation; and
0.5 sec. when an overload (lock) is detected)
Figure 3. MSP Control PCB Identication
Note: DO NOT manipulate the adjusters with a torque exceeding their
tolerance,or it may destroy their stoppers.
Turn them carefully and stop where they hit the stoppers.
Pay extra attention when manipulating the Restarting timer adjuster.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 4 / 8
OUTPUT STEM POSITION ADJUSTABILITY
The control PCB compares and amplifies input signal (set-
point) and position feedback signal from the potentiometer,
and drives the motor to such a direction that the difference
of the two signals is minimized.
0
25 50 75 100
25
50
75
100
0
INPUT SIGNAL (%)
STEM POSITION (%)
Span Counterclockwise
Zero Clockwise
Zero Counterclockwise
Span Clockwise
Adjustable Zero Range
Adjustable Span Range
Figure 4. I/O Characteristics (Adjustable Range)
Maximum Stroke
Minimum
Stroke
L
Yoke Surface
<Reference
position>
Figure 5. Minimum & Maximum Stroke
Table 1. Available Stroke Range for Each Model
MODEL L MIN. STROKE MAX. STROKE
MSP4-1 29 5 10
MSP4-2 34 8 15
MSP5-1 40 5 10
MSP5-3 50 10 20
MSP6-3 58 10 20
MSP6-4 78 20 40
MANUAL OPERATION FUNCTION
(for MSP4 & MSP5 with AC power supply)
1) Be sure to turn OFF the power voltage.
Operation with power voltage being applied may result
in electrical shock or system breakdown.
2) Remove the screw cap on the top surface of the cover us-
ing a 22- mm wrench, etc.
3) Insert the attached hexagon key wrench in the manual
drive shaft as shown in the figure below.
4) The wrench turning direction and the stem operation
direction when seen from above differ according to the
model as shown in the table below.
MODEL
NO. OF TURNS
/OPERATION DISTANCE
[turns/mm]
TURNING DIRECTION
/ OPERATION DIRECTION
MSP4-x3
MSP5-x3
27 / mm CCW
/ GO DOWN
MSP4-x4
MSP5-x4
54 / mm CCW
/ GO UP
MSP4-x7
MSP5-x7
112 / mm CCW
/ GO DOWN
5)Tighten the cap on the cover with a torque of 4 to 6 N·m.
Tightening with an excessive torque may damage the
screw thread of the cap.
Cap
Hexagon key wrench
O ring
Cover
Drive shaft
Figure 6. Manual Drive Shaft
Note: The manual operation function is not available for 24V
DC power model.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 5 / 8
INSTALLATION
The following is an example of procedure for mounting the
MSP unit to a bi-directional valve.
The valve and components such as yoke necessary for
the installation are to be provided by the customer.
Be sure to remove power supply except when needed.
1) Supply power voltage to the MSP and apply 0% (100% for
direct action) input signal to move the output stem to its
fully extended position.
2) Set the valve stem at its lowest position.
3) Attach the yoke to the MSP.
4) Screw the valve stem into the output stem un-
til there is little opening between them.
For applying a sealing pressure, refer to Table 4 and
screw it until the opening equals the contraction (e.g. 0.5
mm for MSP4-x3) that corresponds to the sealing pres-
sure.
5) Fix the both stems with a lock nut.
6) Supply power voltage to the MSP and apply ap-
prox. 50% input signal, and ensure that the gap be-
tween the yoke and the valve bonnet has been closed.
Fix the yoke and the valve.
7) Connect the position indicator and other components as
needed.
Note: When mounting an MSP6 unit (24V AC model) using
M-Systems’s yoke set (model:YSS, for Japan sales
only), refer to Instruction Manual (NM-4893) of the
yoke set for the installation procedure.
MSPx
Bolts (M5)
Position Indicator
Yoke
Lock Nut
Output Stem
Valve Stem
Valve Bonnet
Adjust distance.
Figure 7. Example of the MSP Mounted to a Valve
WIRING CONNECTION
Refer to the following diagram when wiring.
If an optional terminal box is provided, remove its cover and connect leadwires.
black (1) +(U)
–(V)
+(U)
+
COM1
COM2 COM1
white (2)
red (3)
green (4)
yellow (5)
blue (6)
gray (7)
brown (8)
POWER VOLTAGE
INPUT
POSITION OUTPUT (1 – 5V DC)
UP
DOWN
1
2
5
6
9
3
4
7
8
10
11
COM2
COM1
COM1
UP
DOWN
+
FULL-OPEN or
FULL-CLOSED
SIGNAL
FORCED
OPEN/CLOSE
SIGNAL
• (1) to (8): Terminal No. of terminal box.
• Full-open/-closed signals and forced open/close signals are optional.
NOTE
■ With Both Full-open/closed Signal
and Forced Open/Close Signal
UP
DOWN
FORCED
OPEN/CLOSE
SIGNAL
UP
DOWN
FULL-OPEN or
FULL-CLOSED
SIGNAL
POWER VOLTAGE
POSITION OUTPUT (1 – 5V DC)
INPUT
–(V)
+
+
Figure 8. Wiring Diagram
Note 1: The yellow wire must be left unconnected if the position output signal is not required.
Cut the exposed section of copper wire and insulate the tip of the wire.
Note 2: The MSP6 is not provided with full-open/-closed signals.
3.2 min. 4.5 max.
3.2 min.
5.9 max.
10
■WIRING INSTRUCTIONS FOR TERMINAL BOX OPTION
• Other Terminal Box Type
• Sequential Control Signal Suffix Code B
Applicable wire size 1.25 mm
2
Remove insulation by 10 mm.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 6 / 8
ADJUSTMENT PROCEDURE
Remove the cover.
Manipulate ZERO, SPAN, DZ (deadband), and DLY (Re-
starting timer) adjusters and the direct/reverse SW on the
control PCB shown in Figure 3.
Other adjusters which are paint-sealed are for factory use
only and should be changed only by qualified M-System per-
sonnel. Otherwise it could cause breakdown. M-System is
not liable for any malfunction or inconvenience caused by
unauthorized changes made by the user.
■DIRECT/REVERSE ACTION AND OPERATION AT AB-
NORMALLY LOW INPUT
The actuator action is factory set to “Reverse” (i.e. the out-
put stem goes up as the input signal increases.), and the
operation at abnormality to “Go down.”
For changing the setting, use the DIP SW on the control
PCB referring to Tables 2 and 3.
Table 2. Switching Actions
ACTION SW1-3 EXPLANATIONS
Direct ON Output stem goes up as the input
signal decreases.
(Valve stem extended)
Reverse OFF Output stem goes down as the
input signal decreases.
(Valve stem retracted)
Table 3. Operations at Abnormally Low Input
OPERATION SW1-1 SW1-2
Stop – *1ON
Go down/Extend OFF OFF
Go up/Retract ON OFF
*1. The setting of SW1-1 is disregarded in Stop mode.
Note 1: SW1-4 is not used.
Note 2: In ‘Direct’ action, the position output is 5 – 1V DC
proportional to the input 0 – 100%.
■ORDER OF ADJUSTMENTS
After installation, perform adjustments in the order
of: zero; span; seal-spring; and sensitivity (deadband).
Lastly, adjust the limit switches for optional full-open and
full-closed signals.
The following explanation applies to ‘Reverse’ action.
For ‘Direct’ action, read the values in the brackets [ ].
Note: Applying an over-torque to the adjusters may dam-
age the threads or destroy stoppers. Use a small-sized
screwdriver and be sure to stop turning as soon as they
hit the stoppers.
■ADJUSTMENT PROCEDURE
A)Zero and Span
• Supply power voltage to the MSP and apply 0%
[100%] input. Turn Zero adjuster to adjust the
lower-end or fully-extended position of the output
stem (valve stem retracted) to a desired position.
Alternatively, adjust the connecting section of the stems.
For applying a sealing pressure, refer to Table 4 and
screw it until the opening equals the contraction that cor-
responds to the sealing pressure.
• While applying 100% [0%] input, turn the Span adjuster
until the output stem reaches a desired upper-end or ful-
ly-retracted position (valve stem extended).
For three-way valves, the sealing pressure can be applied
also in the direction in which the output stem goes up*2.
Refer to the procedure for Zero adjustment.
• While applying 0% [100%] input again, check that
the output stem reaches the fully-extended position.
If the position is shifted, go through the above procedure
again.
Note 1: The MSP is designed so as to minimize an influence of
Span adjustment on the Zero position.
That is, the lower-end position of the output stem is
hardly displaced when Span adjuster is manipulated.
Note 2: Narrower stroke is more likely to cause hunting
i.e. the motor frequently changes rotation direction.
Adjust Deadband in such a case.
*2. MSP4 is not provided with a sealing spring for the direc-
tion in which the output stem goes up.
Seal-Spring Division
Output Stem
Figure 9. Seal-Spring
Table 4. Spring Contraction
MODEL
SPRING
CONTRACTION
(mm)
SEALING
PRESSURE
(N / lbs)
SET LOAD *
(N / lbs)
MSP4-x3 0.5 147 / 33 98 / 22
MSP4-x4 1.0 300 / 67 250 / 56
MSP4-x7 1.0 686 / 154 294 / 66
MSP5-x3 0.5 150 / 34 110 / 25
MSP5-x4 1.0 294 / 66 216 / 49
MSP5-x7 1.0 686 / 154 294 / 66
MSP6-x3 1.0 588 / 132 441 / 99
MSP6-x4 1.0 1170 / 263 882 / 198
MSP6-x6 1.5 2350 / 529 1170 / 263
* The pre-set load for applying a minimum pressure to seal the
valve when the valve sits on the seat.
Note: The output stem is provided with a scale in millimeters.
In case of MSP4-x7, for example, the sealing pressure
reaches approx. 490 N at 0.5 mm and 686 N at 1 mm.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 7 / 8
B)Sensitivity (Deadband)
There may be a case where the motor operates in re-
sponse to an input signal change but does not stop and
oscillates by frequently changing the rotation direction.
Widen the deadband by turning DZ adjuster clockwise in
such a case.
The deadband is factory-set to 1.5 %.
C)Limit Switches
(for optional full-open and full-closed signals) *
Loosen the screws and adjust positions of the dogs.
Each dog cannot be set at an intermediate position.
Be sure to set the dog at the fully-open or closed-position.
See Figure 9.
Note: Not available when the long-life potentiometer option
(/P) is selected.
Limit Switches
Dog (full-opened position)
Screws
Dog (full-closed position)
Potentiometer
Figure 10. Limit Switches
MAINTENANCE
For effective use and longer life of the MSP, regular checking appropriate for its operating conditions are recommended.
Refer to the following table.
■INSPECTION
ITEM CHECKING POINT HOW TO PROCEED
Stem operation Apply input 0%, 50%, 100%, then back to 50%, 0%.
Check that the actuator operates and positions cor-
rectly at each input value.
Repair or calibrate the unit.
Abnormal sound Check if abnormal sound is heard during operation. Repair the unit.
Connector
Leadwire
Ensure that the connector is firmly connected.
Check for breakage of leadwires.
Ensure that the insulation coating is not broken or
damaged.
Repair or replace the connector/leadwires.
Water or rust inside
the housing
Check that there is no water or rust inside the hous-
ing.
Check that the gasket is not damaged.
Check that the cable connector is not loose.
Remove water, dry the housing and the parts inside.
Replace rusted parts, if any.
Replace the gasket, if damaged.
Re-tighten the cable connector.
Screws Check that screws and bolts are securely fastened. Re-tighten them, if loose.
Lock nut Check that the Lock nut is not loose. Re-tighten the Lock nut if loose and calibrate the
unit.
For repair or parts replacement, contact M-System or representatives.
■LUBRICATION
There is no need of oiling the MSP in normal operating conditions.
■REGULAR TEST RUNNING
If the valve is not frequently operated, run a test operation regularly (once a week, for example) to ensure that the actuator
operates properly.

MSP4 / MSP5 / MSP6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-4854 Rev.15 P. 8 / 8
TROUBLESHOOTING
TROUBLE
POWER
LED
INPUT
LED
S TAT U S
LED POSSIBLE CAUSE HOW TO PROCEED
Actuator
does not
work
ON ON Blink
2 sec.
intervals
Abnormal input signal.
(No change over deadband)
Check input signal.
Narrow the deadband.
ON ---- * Blink
0.5 sec.
intervals
Actuator mechanism is damaged. Repair the unit.
Overload caused by a foreign object caught
in the valve.
Check the valve.
Control PCB damaged. Repair or replace the PCB.
Wiring error at the motor or position sensor. Check the connector.
Low power voltage or insufficient power
supply.
Check the power supply.
ON OFF Blink
2 sec.
intervals
Abnormal input signal. Check the input signal.
Wiring error at the input signal. Check the connector and connecting section.
OFF ---- * ---- * Wiring error at the power supply. Check the connector and connecting section.
Abnormal power voltage. Check the power supply.
Fuse melted. Replace the fuse.
ON ---- * ON Malfunction by noise. Turn off the power supply and restart.
Low power voltage or insufficient power
supply.
Check the power supply.
ON ---- * OFF Malfunction by noise. Turn off the power supply and restart.
Low power voltage or insufficient power
supply.
Check the power supply.
Unstable operation Power voltage is low or fluctuating. Check the power supply.
Unstable input signal. Check the controller, cables. Eliminate
noise.
Position sensor (potentiometer) damaged. Replace the potentiometer.
Stem stops in the middle of stroke
or
Stem slows down in the middle of
stroke
Actuator mechanism is damaged. Repair the unit.
Overload caused by a foreign object caught
in the valve.
Check the valve.
* The input LED status does not matter.
For repair or parts replacement, consult M-System or representatives.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protec-
tors for protection against induced lightning surges.
Please consult M-System for appropriate models.