M-system MRP4 User manual

MODEL: MRP4
Final Control Elements
MINI-TOP ELECTRONIC ACTUATOR
(rotary type)
Functions & Features
• Small-size control valve actuator
• Electrical positioner incorporated
• 1/1000 high resolution
• Easy adjustment: electronic limiter at the valve open &
closed positions
• Overload protection
• Various power inputs
• CE marking available for 24 V DC power
Typical Applications
• Actuator for automatic control valve in pilotplants
• Air-conditioning in buildings or plants
• Micro-flow control for pharmaceutical injection
• For small-size control valves
MODEL: MRP4–[1][2][3][4]–[5][6][7]
ORDERING INFORMATION
• Code number: MRP4-[1][2][3][4]-[5][6][7]
Specify a code from below for each [1] through [7].
(e.g. MRP4-14LT-A0R)
• Special input range (for codes Z and 0)
[1] SPAN
1: 45 to 90 degrees
2: 90 to 180 degrees
[2] OPERATION TIME, TORQUE
4: 7 seconds / 90°, 5 N·m
5: 13 seconds / 90°, 5 N·m
[3] SEQUENTIAL CONTROL SIGNALS
L: Full-open/-closed signal
F: Forced open/close signal
B: Full-open/-closed and forced open/close signals
(Select 'With Terminal Box.')
E: Full-closed/overload signal (Not selectable for CE)
0: Without
[4] TERMINAL BOX
T: With
0: Without
[5] INPUT
Current
A: 4 – 20 mA DC (Input resistance 250 Ω)
Z: Specify current (See INPUT SPECIFICATIONS)
Voltage
6: 1 – 5 V DC (Input resistance approx. 1 MΩ)
0: Specify voltage (See INPUT SPECIFICATIONS)
[6] CE MARKING
C: With
0: Without
[7] POWER INPUT
AC Power
K3: 100 – 120 V AC
(Operational voltage range 90 – 132 V, 47 – 66 Hz)
(Not selectable for CE)
L3: 200 – 240 V AC
(Operational voltage range 180 – 264 V, 47 – 66 Hz)
(Not selectable for CE)
DC Power
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)
GENERAL SPECIFICATIONS
Degree of protection: IP55
Action: Direct or reverse; field selectable with DIP switches
(factory set to “reverse”)
(In “reverse” action, the output stem seen from the cover
turns counterclockwise with an input signal increase.)
Operation at abnormally low input: Counterclockwise turn,
clockwise turn or stop; field selectable with DIP switches
(factory set to“clockwise”)
Note: Counterclockwise or clockwise if seen from the cover.
Detectable input drop level: -16 ±2.5 %
Electrical connection
•No terminal box
Wiring conduit: G 1/2 female; cable connector with 1 meter
wire (0.5 mm2) provided
•Terminal box
Wiring conduit: G 1/2 female (two)
Terminal screws: M3 pillar terminal
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MODEL: MRP4
(Sequential control signal suffix code B)
M3 chromated steel
(other terminal box types)
(torque 0.5 N·m)
Housing material: Diecast aluminium
Drive: Stepping motor
Position detection: Potentiometer
Deadband: 0.1 – 4.5 % adjustable (factory set to 1.5 %)
Restarting timer: 0 – 10 sec. adjustable
(factory set to 1.5 sec.)
Isolation: AC power to signal
Zero adjustment: 0 – 25 %
Span adjustment: 50 - 100 %
Protective functions: Overload protection
Power indicator: Green LED turns on with power supplied.
Input indicator: Green LED turns on with normal input
Status indicator LED: Red light blinks in 2 sec. intervals in
normal operations; blinks in 0.5 sec. intervals when a
foreign object is detected mechanically caught inside.
Manual operation: Not available
INPUT SPECIFICATIONS
• DC Current: Input resistor incorporated (250 Ω)
• DC Voltage: 1 – 5 V DC or specific range within 0 – 5 V DC,
minimum span 1 V
(For a current input, convert the current to a voltage with
250 Ω)
Input resistance: Approx. 1 MΩ
• Forced open/close signal:
Dry contact inputs to command clockwise and
counterclockwise turns
Rating: 5 V DC @ 2.5 mA
OUTPUT SPECIFICATIONS
• Operation Time & Torque (at rated power voltage)
MRP4-x4: 7 sec. / 90°; torque 5 N·m (3.69 ft·lbs)
MRP4-x5: 13 sec. / 90°; torque 5 N·m (3.69 ft·lbs)
• Position Output: 1 – 5 V DC (not isolated)
With “direct” action, 5 – 1 V DC position output is provided
proportionally to 4 – 20 mA DC (1 – 5 V DC) input.
Load resistance: ≥ 5 kΩ
• Full-open / -closed signals: Limit switch contact
Rating: 125 V AC @ 0.75 A (cos ø = 1)
30 V DC @ 0.6 A (resistive load)
Mechanical life: 3 × 107 cycles
Maximum operation frequency: 60 cycles/min.
• Full-closed/overload signal: Relay contact
Full-closed signal trips at approx. 2 % of span.
Rating: 250 V AC @ 1 A (cos ø = 1)
30 V DC @ 1 A (resistive load)
INSTALLATION
Power Consumption
•AC power input: Approx. 25 VA
•DC power input: Approx. 0.6 A
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 85 %RH (non-condensing)
Vibration: 0.5 G max.
Mounting position: All directions
Do not mount the actuator with its output stem or cable
connector on the upside if the actuator is to be exposed to
dripping water.
Weight
DC powered: 1.1 kg (2.43 lbs)
AC powered: 1.3 kg (2.87 lbs)
Add 0.7 kg (1.54 lbs) for the terminal box.
PERFORMANCE
Resolution: 1/1000 or 0.09°, whichever is greater, with 0.1
% deadband setting
Insulation resistance
•AC powered: ≥ 100 MΩ with 500 V DC
(signal or metallic housing to power)
≥ 100 MΩ with 100 V DC
(signal to metallic housing)
•DC powered: ≥ 100 MΩ with 100 V DC
(signal or power to metallic housing)
Dielectric strength
•AC powered: 1500 V AC @ 1 minute
(signal or metallic housing to power)
100 V AC @ 1 minute
(signal to metallic housing)
•DC powered: 100 V AC @ 1 minute
(signal or power to metallic housing)
STANDARDS & APPROVALS
CE conformity:
EMC Directive (2004/108/EC)
EMI EN 61000-6-4: 2007
EMS EN 61000-6-2: 2005
Low Voltage Directive (2006/95/EC)
EN 61010-1: 2001
Measurement Category II
Pollution Degree 2
Full-open/-closed signal to other, power or metallic
housing: Reinforced insulation (125 V)
TERMINOLOGY
• Overload (Lock) Protection
The Mini-Top Series is equipped with a protection circuit
against overload caused by for example the valve catching
an alien substance.
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MODEL: MRP4
When an overload is detected, the Mini-Top stops supplying
power to the motor and the status LED blinks in 0.5 sec.
intervals.
The protection is reset automatically with applying opposite-
direction input signal or turning the power off and
restarting.
• Restarting Timer
The Mini-Top Series is equipped with a timer circuit which
gives an interval period (0 – 10 seconds) between stop-
restart actions to prevent the motor and other internal
components from overheating.
It is recommended to set a long restarting time when the
ambient temperature and/or the temperature of flow
material is high.
• Electronic Limiter
This model is equipped with electronic limiters in order to
prevent mechanical locks when the input goes below 0 % or
above 100 %.
Limiters are set at approx. -0.5 % for the full-closed side,
approx. 100.5 % for the full-open side.
• Full-open/-closed signal (limit switch contact)
The Mini-Top series is optionally equiped with
full-open/-closed signal that makes at full-open or -closed
position. These positions are NOT proportional to the span
and/or zero adjustments.
• Full-closed/overload signal (relay contact)
The Mini-Top series is optionally equiped with full-
closed/overload signal that makes at full-closed position
and/or detecting overload (see “Overload Protection”). This
full-closed position is proportional to the span and/or zero
adjustments.
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MODEL: MRP4
TERMINAL CONNECTIONS
(1) to (8): Terminal No. of terminal box.
Full-open/-closed signals, forced open/close signals and full-closed/overload signals are optional.
+(U)
–(V)
+
COM1
+
COM2
POWER
INPUT
POSITION OUTPUT (1 – 5V DC)
FULL-OPEN or
FULL-CLOSED
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
COM1
FORCED
OPEN/
CLOSE
SIGNAL
(
output stem
)
turn CCW
(
output stem
)
turn CW
1
3
2
4
6
5
7
8
11
9
10
• With Both Full-open/closed Signal
and Forced Open/Close Signal
COM2COM1 COM3
POWER
black (1) +(U)
–(V)
white (2)
red (3) +
INPUT
COM1
green (4)
POSITION OUTPUT (1 – 5V DC)
+
yellow (5)
blue (6)
gray (7)
brown (8)
FULL-OPEN or
FULL-CLOSED
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
FORCED
OPEN/CLOSE
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
OVERLOAD
FULL-CLOSED
FULL-CLOSED or
OVERLOAD SIGNAL
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MODEL: MRP4
DIMENSIONS unit: mm (inch)
99 (3.90)
23 (.91)
42 (1.65) 43 (1.69) 22 (.87)
CABLE CONNECTOR
w/1 meter (3.28 ft) LEADWIRE
20 (.79)
90 (3.54)
[130 (5.12)]
127 (5) [167 (6.57)]17
(.67)
98 (3.86)
10 –0.043 sq.
0
46 (1.81) dia.
4–M5 10 (.39) deep
YOKE SURFACE
17 (.67)2 (.08)
36 –0.1 dia.
0
12 (.47) dia.
YOKE CONNECTION
[ ] forAC power supply
99 (3.90) 67 (2.64)
23 (.91)
42 (1.65) 43 (1.69)
35 (1.38) 60 (2.36)
110 (4.33) [150 (5.91)]
98 (3.86)90 (3.54) [130 (5.12)]2 (.08)
127 (5) [167 (6.57)]17 (.67)
10 –0.043 sq.
0
46 (1.81) dia.
4–M5 10 (.39) deep
2–G 1/2 CONDUIT
YOKE SURFACE
36 –0.1 dia.
0
12 (.47) dia.
YOKE CONNECTION
7.5 (.30) 32.5 (1.28)
34 (1.34)
20 (.79)
Cable connector or leadwires not provided with terminal box.
[ ] for AC power supply
■TERMINAL BOX TYPE
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MODEL: MRP4
SCHEMATIC CIRCUITRY
COM1
COM2
COM1
COM3
FULL-CLOSED
Full-open/-closed signals, forced open/close signals and full-closed/overload signals are optional.
Disregard the switching regulator circuit for DC power input.
INPUT STATUS
Position
Detector
SZ
MOTOR
POT
LIMIT
SW
FULL-OPEN
or FULL-CLOSED SIGNAL
CCW
CW
RESTART
TIMER
DEADBAND
ADJ.
MODE
SELECTOR
Motor Control
Logic
Motor
Driver
Hi / Lo
Limiter
Input
Circuit
Position
Output
Switching
Regulator
POWER
Power
Circuit
CCW
CW
FORCED
OPEN/
CLOSE
SIGNAL
POWER
+ (U)
– (V)
+
+
INPUT
4 – 20mA DC
(1 – 5V DC)
POSITION
OUTPUT
1 – 5V DC
OVER LOAD
FULL-CLOSED
or OVERLOAD SIGNAL
R
R
Specifications are subject to change without notice.
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MRP4 / MRP5 / MRP6
P. 1 / 8EM-4824 Rev.7
MINI-TOP ELECTRONIC ACTUATOR
(rotary type) MODEL
MRP4/MRP5
/MRP6
INSTRUCTION MANUAL
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........................................................................ (1)
The Mini-Top is not provided with a yoke or other compo-
nents required for mounting it to a valve. They are to be
provided by the user.
■MODEL NO.
Confirm that the model number described on the product is
exactly what you ordered.
POINTS OF CAUTION
■CONFORMITY WITH EC DIRECTIVES
•ThisequipmentissuitableforuseinaPollutionDegree
2 environment and in Measurement Category II, with the
maximum switching voltage of 125V. (Applicable to the
full-open/-closed signal only)
 Priortoinstallation,checkthattheinsulation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 con-
nected 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:
Rating100–120VAC:90–132V,47–66Hz,approx.25VA
 Rating200–240VAC:180–264V,47–66Hz,approx.25VA
Rating24VDC:24V±10%,approx.0.6A
•A fuse of the following rating is incorporated: 250V/1A
time delay.
•Arushcurrent1.5timesashighastheaboveratingscan
flow at the startup.
■GENERAL PRECAUTIONS
•Removethepowersupplytotheactuatorbeforewiringtoit.
■INSTALLATION
•Indoor,oroutdoorwheretheMRPisNOTexposedtodi-
rect sunlight.
•Ambienttemperature:-5to+55°C(23to131°F)
•Vibration:0.5Gmax.
•Install the MRP where you can reach for maintenance.
Observe at the minimum of 15 centimeters (6 inches)
above the cover.
■OUTDOOR USE
•WheninstallingtheMRPoutdoororwhereitisexposedto
rain or water drops, be sure to fasten the cable connector
tightly and leave a slack of the cable.
•DonotmounttheMRPinsuchdirectionthattheoutput
stemorcableconnectorisatthetopoftheMRPunit.
■ELECTRICAL CONNECTION
•WithDCpowertypeunit,powersupplyandsignallines
are not isolated. Use an isolator if needed.
•When you use a cable other than the standard 1-meter
cable equipped with non-terminal box type unit and its
extension distance is longer than that, use shielded cables
for signal line, or install signal cables in a separate piping
from power supply cables.
■LIGHTNING SURGE PROTECTION
•Inordertoprotecttheunitfromlightningsurgesentering
through cables, use of appropriate lightning surge protec-
tors 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mod-
el:MDP-D24.
■PID CONTROLLER
•ChoosePIDparameterscarefullysothattheMVremains
as stable as possible. Unstable operations shorten the life
of actuator and valve.
■O-RING, GASKET
•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
gasket is in place.
■YOKE DESIGN
•Whena foreignobjectis caughtin thevalve, atorque2
times greater than the maximum rating could be gener-
ated. Leave enough strength for mechanical components
such like the yoke and stem.
•Ifthe MRPis usedona steamline intemperature con-
trol,itispossiblethattheMRP’stemperatureriseshigher
than the ambient temperature due to transmission or ra-
diation via the steam piping, even when the ambient tem-
perature is within allowable range.
Use a longer yoke to increase heat dissipation and apply
insulating material.
■AND ....
•DONOTloosenthescrewxingthepotentiometerstem.
Loosening it could cause a malfunction.
•DO NOT steponto the actuator.DO NOT rest a heavy
objectonoragainstit.
Cable Connector
DO NOT Pull Tightly
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MRP4 / MRP5 / MRP6
P. 2 / 8EM-4824 Rev.7
PROTECTIVE FUNCTIONS
■OVERLOAD (LOCK) PROTECTION
The MRP is equipped with a protection circuit against
overload cause by for example valve catching an alien sub-
stance.
When an overload is detected, the MRP stops supplying
powertothemotorandthestatusLEDashesin0.5sec.
intervals.
The protection is reset automatically with applying oppo-
site-direction input signal or turning power off and restart-
ing.
Aforeignobjectcaughtinthevalve,inappropriateadjust-
ments, ground screw of the valve tightened too much, etc.
are some of the causes of overload. Check these parts and
remove the cause of trouble for ensuring proper life of the
actuator.
■FUSE
A fuse is equipped for protection against overload current.
Whenyouturnthepowersupplyon,checkthatthepower
LEDison.Ifitisoff,checkthatthefuseismelted.Replace
it with a new one.
If the new fuse is melted again soon after it has been re-
placed,theremaybeproblemswiththecontrolPCBorthe
motor. Contact M-System or sales representative.
■RE-STARTING TIMER
TheMRP isequipped withatimer circuitwhich givesan
interval period (0 – 10 sec.) between stop-restart actions
to prevent the motor and other internal components from
overheating.
It is recommended to set a long restarting time when the
ambient temperature and/or the temperature of flow mate-
rial is high.
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MRP4 / MRP5 / MRP6
P. 3 / 8EM-4824 Rev.7
COMPONENT IDENTIFICATION
Power Input PCB
(for AC power)
Insulation Barrier
Control PCB
Motor
Potentiometer
Connector
O-Ring
Cable
Cable Connector
Output Stem
0
25
Power Input PCB (for AC power)
Insulation Barrier
Control PCB
Motor
Potentiometer
Manual Operation Stem
Gasket
Cable
Cable Connector
Output Stem
Position Indicator
Figure 1. MRP4 & MRP5 Component Identication Figure 2. MRP6 Component Identication
Remark:ConstructionoftheMRP5ispartlydifferentfrom
the above figure.
OFF
1
2
3
4
ON
PWR INP ALM
DLY
ZERO SPAN DZ
Insulation Barrier
Fuse
Connector
SW1
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 with power supplied)
: Input Indicator (green with input applied)
: Status Indicator (red blinks in 2 sec. intervals,
blinks in 0.5 sec. intervals with mechanical lock detected)
Remark:Turningadjustmentpotentiom-
eters and switches with a torque exceed-
ing their tolerance may destroy their stop-
pers.
Turn them carefully and stop where they
hit the stoppers. Be careful especially
withRe-startingtimeradjustment.
Figure 3. MRP Control PCB Identication
Remark:  MRP6 is equipped with manual operation stem
and position indicator. Turn the stem in counterclockwise
as viewed from the top of the actuator to close the valve
(reverseaction).Turnitslowlywitha6mm-widthwrench
(Operationtorque≤9N·m).
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MRP4 / MRP5 / MRP6
P. 4 / 8EM-4824 Rev.7
OUTPUT SPAN ADJUSTABILITY
The servo-control circuit compares and amplifies input sig-
nal (setpoint) and feedback signal from a potentiometer, and
drivesthemotortosuchdirectiontominimizedifferenceof
the two signals.
Thegeneraloperationalrangeis0–90deg.or0–180deg.
with a 5-deg. margin at both limits. See Figure 5.
INSTALLATION
ThefollowingisageneralprocedureformountingtheMRP
to a valve with a yoke and coupling.
BesureNOTTOCHANGEfactoryadjustedsettingofthe
MRP.
Remove power supply during the procedure unless other-
wise specified.
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)
Table 1. Available Span Range for Each Model
MODEL MIN. SPAN MAX. SPAN
 MRP4-1   
 MRP5-1 45° 90° 
 MRP6-1
 MRP4-2 90° 180°
 MRP6-2
Standard Zero Position
M
i
n
i
m
u
m
s
p
a
n
M
a
x
i
m
u
m
s
p
a
n
M
a
x
i
m
u
m
O
p
e
r
a
t
i
o
n
R
a
n
g
e
5 deg.
5 deg.
Adjustable Zero Range
Adjustable Span Range
Figure 5. Minimum & Maximum Span
MRPx
Bolts (M5)
Output Stem
Coupling
Yoke
Valve Bonnet
Figure 6. Example of the MRP Mounted to a Valve
1) SupplypowertotheMRPandapply0%input(100%for
direct action). Turn the output stem fully clockwise (seen
from the cover).
2) Turn the valve stem to fully closed position (fully clock-
wise).
3) SettheyoketotheMRP.
4) SetthecouplingtothevalvestemandttheMRPout-
put stem into the coupling. Then fix the yoke and valve
temporarily.
5) Fix the coupling so that there is no eccentricity between
both stems.
6) Fixtheyokeandvalvermlyaftercheckingtheeccen-
tricity of both stems again.
7) Attachthepositionindicatorifrequired.
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MRP4 / MRP5 / MRP6
P. 5 / 8EM-4824 Rev.7
WIRING CONNECTION
Refer to the following diagram when wiring. If an optional terminal box is provided, remove its cover and connect lead-
wires.
Figure 7. Wiring Diagram
(1) to (8): Terminal No. of terminal box.
Full-open/-closed signals and forced open/close signals are optional.
Full-closed/overload signals are optional only for model: MRP4.
+ (U)
– (V)
+
COM1
+
COM2
POWER
INPUT
POSITION OUTPUT (1 – 5V DC)
FULL-OPEN or
FULL-CLOSED
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
COM1
FORCED
OPEN/
CLOSE
SIGNAL
(
output stem
)
turn CCW
(
output stem
)
turn CW
1
3
2
4
6
5
7
8
11
9
10
• With Both Full-open/closed Signal
and Forced Open/Close Signal
COM2COM1 COM2
POWER
black (1)
+ (U)
– (V)white (2)
red (3)
+
INPUT
COM1
green (4)
POSITION OUTPUT (1 – 5V DC)
+
yellow (5)
blue (6)
gray (7)
brown (8)
FULL-OPEN or
FULL-CLOSED
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
FORCED
OPEN/CLOSE
SIGNAL
(
output stem
)
turned CCW
(
output stem
)
turned CW
OVERLOAD
FULL-CLOSED
FULL-CLOSED or
OVERLOAD SIGNAL
Remark: 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.
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 mm2
Remove insulation by 10 mm.
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MRP4 / MRP5 / MRP6
P. 6 / 8EM-4824 Rev.7
ADJUSTMENT PROCEDURE
Open the cover and adjust ZERO, SPAN, DZ (deadband),
DLY (re-starting timer) potentiometers and the direct/re-
verseSWonthecontrolPCBasshowninFigure3.
Other adjustments which are paint locked are for factory
use only and should be changed only by qualified M-System
personnel. M-System is not liable for any malfunction or
inconvenience caused by unauthorized change of them by
the user.
■DIRECT/REVERSE ACTION
Theactuatoractionisfactorysetto“Reverse”(the output
stem, seen from the cover, turns counterclockwise, with an
input signal increase). For changing the setting, use the
DIPSWonthecontrolPCB.RefertoTables2and3.
Remark1:SW1-4isnotused.
Remark 2:  With the direct action, the position output is
5–1VDCproportionaltotheinput0–100%.
Table 2. Switching Actions
ACTION SW1-3 EXPLANATIONS*1
 Direct ON OutputstemturnsCWwithan
input increase.
 Reverse OFF OutputstemturnsCCWwithan
input increase.
Table 3. Operations at Abnormally Low Input
OPERATION*1SW1-1 SW1-2
Stop *2ON
Clockwise OFF OFF
Counterclockwise ON OFF
*1. Seen from the cover.
*2.
WhateversettingforSW1-1isdisregardedforStopmode.
■GENERAL
Afterinstallingthevalveandactuator,gotoadjustmentsin
orderofzero,span,andsensitivity(deadband).Ifoptional
limitswitchesareprovided,adjustthematthelast.
The following explanation applies to reverse action For di-
rect action, read the value in the brackets [ ].
Remark:Applyinganover-torquetotheadjustmentsmay
destroy stoppers or other sections of them. Use a small-
sized screwdriver and be sure to stop turning as soon as
they hit the stoppers.
■ADJUSTMENT PROCEDURE
A) Zero and Span
•Applypowersupplyvoltageand0%[100%]input.Turn
ZERO adjustment until the output stem reaches an ap-
propriate fully-clockwise position.
•Apply100%[0%]input.TurnSPANadjustmentuntilthe
output stem reaches an appropriate fully-counterclock-
wise position.
•With0%[100%]inputagain,checkthattheoutputstem
is at the appropriate angle. If the position is shifted, go
through the above procedure again.
Remark1:Thereisonlyminimaleffectofspanadjustment
tozeropoint,thusthestempositionshiftsverylittleatthe
extended side when the span potentiometer is turned.
B) Sensitivity (Deadband)
Whenthemotorrepeatssmallinvertingmovementswith-
out stopping still for small input changes, widen the dead-
bandbyturningtheDZadjustmentclockwise.
C) Limit Switches (optional)
Loosenthescrewsandadjustpositionsofthedogs.SeeFig-
ure8.
Thisadjustmentcannotbedoneinanintermediateposition
of the valve. Set it at the fully open or closed position.
Potentiometer
Limit Switches
Dog (full-opened position)
Screws
Dog (full-closed position)
Figure 8. Limit Switches
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MRP4 / MRP5 / MRP6
P. 7 / 8EM-4824 Rev.7
MAINTENANCE
ForeffectiveuseandlongerlifeoftheMRP,regularcheckingappropriateforitsoperatingconditionsarerecommended.Refer
to the following table.
ITEM CHECKING POINT HOW TO PROCEED
Functioning Applyinput0%,50%,100%,thenbackto50%,0%.
Check the actuator operations and positions at
each input value.
Repair or calibration
Abnormal sound No abnormal sound is heard during operation. Repair or calibration
Connector
Leadwire
The connector is firmly connected.
No breakdown of leadwires.
The insulation covers are not torn, not bruised.
Repair or calibration
Inside humidity, rust No condensation. No rust.
If there is water inside, check the packing.
Remove water, dry the case and inside parts.
Replace rusted parts. Calibration.
If the packing is damaged, replace it.
Screws Check that screws and bolts are securely fastened. Re-tighten them.
For repair or parts replacement, contact M-System or representatives.
■LUBRICATION
ThereisnoneedofoilingtheMRP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 check proper functions.
TROUBLESHOOTING
TROUBLE
POWER
LED
INPUT
LED
S TAT U S
LED POSSIBLE CAUSE HOW TO PROCEED
No
function
ON ON Flash
2 sec
Abnormal input signal.
(No change over deadband)
Check input signal.
Narrow the deadband.
ON ---- Flash
0.5sec
Actuator mechanism is damaged. Repair
Overloadcausebyaforeignobjectcaught
in the valve.
Check the valve.
ControlPCBdamaged. Repair or replace.
Wiringerroratthemotororpositionsensor. Check the connector.
Low power voltage or insufficient capacity. Check the power supply.
ON OFF Flash
2 sec
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 supply 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 capacity. Check the power supply.
ON ---- OFF Malfunction by noise. Turn off the power supply and restart.
Low power voltage or insufficient capacity. Check the power supply.
Unstable functioning Powervoltageislowoructuating. Check the power supply.
Unstable input signal. Check the controller, cables. Eliminate
noise.
Positionsensordamaged. Replace the position sensor.
Stops in the middle of span
Slows down in the middle of span
Actuator mechanism is damaged. Repair
Overloadcausebyaforeignobjectcaught
in the valve.
Check the valve.
----RegardlessofLEDstate.
For repair or parts replacement, contact M-System or representatives.
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