Koei Industry Nucom L50S User manual

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ELECTRONIC CONTROL
ACTUATOR
OPERATION MANUAL
“ Nucom Series “
LINEAR TYPE
Nucom – L50S
Koei Industry Co., Ltd.

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In order for better and safety use of the product for a long period, please observe this
“WARNING and CAUTION “ carefully.
Here are the specification and operation manual for the product to prevent suffering
injury or loss by accidents.
The contents are divided into “WARNING” and “CAUTION” for different degree of
risks.
Please strictly observe them, as both of them are very important for your safety.
FOR YOUR SAFETY
WARNING: Improper handling of the product disregarding the notes under this
mark may cause injury or death to a man.
CAUTION: Improper handling of the product disregarding the notes under this
mark may cause injury or material loss.
WARNING
* This product is not of explosion-proof.
Do not use it in the environment with flammable gas (gasoline etc.) or
corrosive gas.
* Do not dismantle the actuator from the valve during power operation.
* Do not make wiring work when power is being supplied.
CAUTION
* Do not drop the product or give a shock to the product, for it may
cause defects to the product.
* Do not get on the actuator, or it may cause defects or an accident.
*Do not make wiring work in the rain or in splashing water.

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CONTENTS
1. GENERAL
2. CONFIGURATION AND NAMES OF PARTS
3. FUNCTIONAL SPECIFICATION
4. OPERATION PRINCIPLE
5. INSTALLATION
5-1 Installation place
5-2 Ambient temperature, fluid temperature
6. ASSEMBLY WITH A VALVE
7. WIRING
7-1 Wiring with power / input signal
7-2 Wiring work
8. RATED POWER, INPUT SIGNAL AND WIRING DIAGRAM
8-1 Rated power
8-2 Input signal
8-3 Recommendable fuse or breaker
8-4 Wiring diagram
9. CONTROL PACK
9-1 Names of parts
9-2 Mode selection
9-3 Sensitivity volume and ZERO / SPAN adjustment
10. OPERATION
10-1 Manual operation
10-2 Power operation
11. MAINTENANCE / INSPECTION
12. TROUBLE SHOOTING

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1.GENERAL
The system is a linear type Electronic Actuator to continuously position valve opening with direct
signals (4 ~ 20mA) from a controller or computer.
The system is robust, maintenance free and far more precise (Resolution 1/250) than traditional
pneumatic actuators, and will help save process equipment and running costs.
FEATURES
* Compact and light
* High resolution (More than 1/250)
* Direct / reverse action selectable by mode selection switch
* Open/Close/Stop mode during power interruption selectable by mode selection switch
* Resin-molded servo control pack for water and vibration proof
* Helps simplify process flow
* Saves process equipment and running costs to one over decades compared with pneumatic system.
* Torque limiter and impedance protection motor to prevent motor burnout.
2. CONFIGURATION AND NAMES OF PARTS
FIG.1

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3. FUNCTIONAL SPECIFICATION
MODEL
ITEM Nucom-L50S
RATED VOLTAGE AC100/110/115/120V±10% (50/60 Hz)
AC200/220/230/240V±10% (50/60 Hz)
INPUT SIGNAL 4~20mA DC(1~5V DC) (Standard )
4~12/ 12~20 mA DC(Option )
SHAFT OUTPUT 1,470N(150kgf)
OPERATION SPEED 1.25mm/sec(50Hz) 1.50mm/sec(60Hz)
SHAFT STROKE 0~50mm
RESOLUTION Over 1/250
DEAD ZONE 0.5% F.S.
LINEARITY 0.5% F.S.
ACTION MODE Direct(DA), Reverse(RA) Selectable
MODE DURING SIGNAL “OFF” Close/Open/Stop Selectable
PROTECTION
Top position limit switch (Standard)
Bottom position torque limiter (Standard)
Thermal protector (Standard)
AMBIENT TEMPERATURE –25~55°C
RATED CURRENT 0.22A(AC100V) 0.25mA(AC110V)
MOTOR 8W reversible motor Class E
DUTY RATING Continuous
POSITION DETECTION Potentiometer
OUTPUE SIGNAL 1~5V DC (Output impedance 1kΩ)
INSULATION RESISTANCE 500V DC/100MΩbetween terminal and body
WITHSTAND VOLTAGE 1000V AC/1 minute between motor coil and body
TERMINAL 6-pin terminal block (Control pack)
MANUAL OVERRIDE Allen key (Opposite 4mm)
CONDUIT G1/2
× 2
WATER PROTECTION To IP-65
EXPLOSION PROOF Non-explosion proof
MOUNTING ANGLE Angle free
BODY MATERIAL Die cast aluminum (ADC12)
COATING Grey (Munsell scale N-6)
WEIGHT Approx. 3.0kg

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4.OPERATION PRINCIPLE
Control pack (Electronic module) makes relational operation between input signals (4~20mA) and
position signals detected by potentiometer, and drives motor in direction to balance both the signals.
Motor stops at the position where both the signals are balanced.
Motor revolution (Direct and reverse) is transmitted in the order of
Gear head 2-Speed gear A 2-Speed gear B Spur gear C Screw shaft,
then converted into linear movement to stroke main shaft up and down.
Potentiometer always detects the shaft position and feedbacks it to control pack.
The sequence of the above movement allows the system to continuously perform proportional
operation against input signals.
< Block Diagram >
Out
p
ut
si
g
nal
Re
g
ulato
AC/DC Control
Power source
Power
source
In
p
ut
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g
nal
Am
p
.
circuit
RA/DA
chan
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Differentia
circuit Com
p
ariso
circuit
Drive
circuit
OFF mode
ACTION
Screw shaft
2-Speed gea
r
2-Speed gea
r
S
p
ur
g
ear C
Moter
N
ut
Out
p
ut thrus
t
Potentiometer

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O
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IR
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NMENTAL IN
S
TALLATI
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CO
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5. INSTALLATION
5-1 Installation place
Caution on indoor installation
* The actuator is not of explosion-proof type. Avoid installation in a hazardous place.
* Cover whole the unit, when installing it in a place where water or materials are always splashing..
* It is recommendable to reserve a space for manual maintenance work.
(depends on installation conditions)
Caution on outdoor installation
* Cover or shade whole the unit, and avoid rainwater or direct sunlight,.
(This may cause temperature rise in the unit, or may effect on anti-climate property of seals )
* It is recommendable to reserve a space for manual maintenance work.
(depends on installation conditions)
Actuator surface materials and treatment
MODEL
PART Nucom-L50S
BODY BASE
Die cast Aluminum
Oxidation treatment
Electrostatic coating
BODY COVER
Die cast Aluminum
Oxidation treatment
Electrostatic coating
OUTPUT SHAFT SUS 303
DUST COVER ON
MANUAL OVERRIDE NBR
OIL SEAL NBR
5-2 Ambient temperature / fluid temperature
Ambient temperature
* Environmental temperature range for use : –25°C~55°C.
* For use in minus temperature, space-heater is available at option.
* For use in temperature beyond the specified range, refer to our Sales Dept.
Fluid temperature
It is occasional that if the actuator is applied to a high temperature fluid line, the unit may overheat
with transmitted line heat.
For high temperature application, we suggest using radiation type yoke and coupling.

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C
A
U
TI
O
N
O
N
W
IRIN
G
WO
RK
CAUTION ON ASSEMBLY WITH A VALVE
6. ASSEMBLY WITH A VALVE
Names of parts
As shown in Fig.3, actuator and valve are individually structured for easy dismounting when trouble is
occurred.
Assembly procedures
1. Be sure that power is off before making manual operation.
2. Drive the valve manually and confirm that it is normal.
Then set it at full close position.
3. Fit a bracket to the actuator.
4. After the actuator is set at full close, couple output shaft and the valve stem with coupling.
5. Manually drive the actuator, and make sure that it moves smoothly without eccentricity.
7. WIRING
7-1 Wiring of power and signal cables
Remove the side plate cover (or body cover), and find 6-P terminal block inside.
Actuator
Bracket Coupling Valve
Control pack
Terminal
Cover
Set screw
Conduit
FIG.3
FIG.4

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Caution on wiring
A qualified person based on electric equipment technical standard should make wiring work.
Refrain from wiring work under rainy or high humid conditions.
Make proper wiring to the wiring diagram.
For the standard resin conduit, use a cable of outer diameter φ9~11mm. (Refer to Fig.5)
For customer conduit, select a proper size cable to match it and avoid water ingress through the gap.
Secure the cover and conduit tightly after wiring is over and avoid water ingress.
7-2 Wiring work
Use sufficiently shield tubes or conduit to prevent water ingress.
(Top) (Top)
(Bottom)
(Bottom)
Branch
Branch
Rubber bush
Body
G1/2
O-ring
Seal
Cable φ9~φ11
FIG.5
FIG.6

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C
A
U
TI
O
N
O
N
US
E
8. RATED POWER / INPUT SIGNAL AND WIRING DIAGRAM
8-1 Rated power
AC 100/110/115/120V±10% (50/60Hz)
AC 200/220/230/240V±10% (50/60Hz)
For different supply from the above, refer to our Sales Dept.
8-2 Input signal
4~20mA DC (1~5V DC) Standard
4~12mA DC Option
12~20mA DC Option
Note: Wiring should be made properly to reject noise disturbance etc.
8-3 Recommendable fuse or breaker
Install a protection fuse or breaker on supply source referring to the following table
Model Capacity of fuse / breaker Motor capacity
Nucom-L50S 2A 8W
8-4 Wiring diagram

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A
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TI
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E
9. CONTROL PACK
9-1 Names of parts
9-2 Mode selection
Input signal and operation direction
Direct or reverse action is selectable by Select switch.
Action during signal interruption
When signal circuits are open or a signal is lowered below 2mA during operation, the system
recognizes as “signal interrupted”, and stops movement at the preset position by Select switch.
Note : Before setting a direction or action mode, be sure that power is off.
Slide left for Direct Action
Input signal 20mA—bottom(close)
4mA—top(open)
Slide right for Reverse Action
Input signal 20mA—top(open)
4mA— bottom (close)
Slide left for stop at top position (open)
Keep center for stop at the existing position
(stop)
Slide right for stop at bottom position (close)
No. Name
1 Terminal block for
custom wiring
2 ZERO trimmer
3 SPAN trimmer
4 GAIN trimmer
5 Direction mode switch
6 Mode switch for
“Signal Off”
7 Connector for
internal wiring(CN-1)
Mode select switch for
DA/RA mode (slide switch)
Mode select switch for
“
Signal Off
”
mode (slide switch)
(SW1) (SW2)
(SW1) (SW2)
FIG.8
FIG.9
FIG.10
1 2 3 4 5 6 7

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FIG.11
* Direct / reverse direction and action mode during signal interruption (signal “off”) may be set in the
following 6 combinations.
* Unless expressly instructed, the unit is preset before shipment in the following combination:
Action mode RA
Signal “OFF” mode Stop
Note : Adjust 4~20mA signal rates from a computer or controller accurately.
The unit recognizes any signals below 2mA as “signal interrupted” and will automatically operate
according to the preset mode.
9-3 Sensitivity volume and ZERO / SPAN adjustment
* Resolution is preset at 1/250 (0.4%) before shipment.
Noise disturbance on signals will unnecessarily and frequently drive the motor and will heavily
shorten its life. In such a case, user may mitigate the influence of such disturbance by lowering
sensitivity within an allowable range.
Note : ZERO / SPAN volume is pre-adjusted appropriately before shipment.
Do not re-adjust it unless it is by all means necessary.
For adjustment, use a trimmer driver within the torque range of 300g/cm.
Avoid applying excessively large force, for it may cause troubles to the unit.
ZERO volume
* CW for higher
Adjustable range : -25 to +25%
SPAN volume
* CW for wider
Adjustable range : 50 to 200%
Note : First adjust ZERO, then adjust SPAN.
ZERO volume
(SW1) (SW2)
SPAN volume
FIG.12
FIG.13
Sensitivity volume
(SW1) (SW2)
Sensitivity volume
* Clockwise for higher
* Counter clockwise for lower
* Max. resolution : About 1/300
* Min. resolution : About 1/100

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C
onfirm that
p
ower is
O
FF before makin
g
manual o
p
eration
Manual
override shaft
Allen key
10. OPERATION
10-1 Manual operation
10-2 Power operation
1. Before making power operation, confirm by manual operation that valve position is exactly
matching with actuator at top / bottom limit positions.
Note : Confirm that the shaft moves smoothly without eccentricity .
2. Confirm that the wiring is proper, also confirm with external signals that valve is normally
positioned at top and bottom limits.
3. Start operation after confirmation is over.
Allen key hole Opposite 4mm
Stroke 2mm /turn
When making manual operation,
ｂｅ sure that power is off.
If power is on while manual operation,
the lever handle will suddenly return!
1. Remove dust cover from the body and find a
hexagon hole in the underneath..
2. Insert lever handle into the hole to turn the shaft C
W
for downward, CCW for upward.
N
ote : Do not apply excessively large force beyond the
operation range, for it may cause troubles to the unit.
CAUTION
FIG.14

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11. MAINTENANCE / INSPECTION
Lubrication
As the major parts of the products are lubricated with long life anti-corrosive grease before shipment,
re-lubrication is in principle not required.
Inspection
When re-starting operation after a long period of rest, make the following confirmation.
1. Cut power off, confirm by manual operation that valve moves smoothly without eccentricity.
2. Open body cover and check if there is no condensation inside the unit, also no problem on wiring.
Note : After checking, firmly screw up the covers to prevent water ingress.
12. TROUBLE SHOOTING
TROUBLE AND PROBABLE CAUSE SOLUTION
* MOTOR DOES NOT START UP
Power is off Supply power
Signal is off or below 2mA Check signal
Circuits or terminal are open Renew cables or re-connect terminal
Supply voltage is improper or too low Check terminal voltage with a tester
Limit switch is faulty Renew limit switch
Motor is defective or lead wire is broken Renew actuator
Over capacity for motor advancer Replace advancer (condenser)
Load is insufficient for torque limiter function
(Check if lamp lights) Change the setting rate for torque limiter
Wire connector is open Insert connector (CN-1, 9-pin, white
color) properly
* INPUT SIGNAL AND OPENING POSITION
ARE NOT MATCHING EACH OTHER
ZERO / SPAN adjustment is improper Re-adjust ZERO / SPAN volumes
* MOTOR IS CONSTRAINED AT UPPER
LIMIT
Upper position limit switch is set out of range Re-adjust the switch
Limit switch is faulty Renew limit switch
* MOTOR IS CONSTRAINED AT LOWER
LIMIT
Setting rate for bottom torque limiter is too large Change the setting rate for torque limiter
Limit switch is faulty Change limit switch
* For other situation of troubles than the above, please refer to our Sales Dept.
* For any special version, contact our Sales Dept