INSTRUCTIONINSTRUCTIONMANUALMANUALPADDLE TYPE LEVEL SWITCH
MODEL： HL-400

Meanings of indications for safety used in this Instruction Manual are as follows.
WARNING:

Indicates that improper handling assumes the risk of a fatal or serious injury.

CAUTION:

Indicates that improper handling assumes the risk of injury or damage to property only.

TOWA SEIDEN INDUSTRIAL CO., LTD.
HEAD OFFICETOKYO OFFICENAGOYA OFFICE

Phone: 81-6-6340-5522, Fax: 81-6-6340-5519
Phone: 81-3-5484-2171, Fax: 81-3-5484-2175
Phone: 81-52-937-5817, Fax: 81-52-937-5836

OSAKA PLANT

Phone: 81-6-6340-2831, Fax: 81-6-6349-6551

URL http://w w w .tow a-seiden.co.jp№EH41000-2№EH41000-3
2009.01.09.改訂
2009.01.09.改訂
2011.01.18.改訂
2011.01.18.改訂
2011.12.20.改訂

Table of Contents[1] Operation Principle ······································································································

2[2] Standard Specifications································································································

22-1. Outline drawings·····································································································

22-2. Specifications··········································································································

2[3] Type····························································································································· 3[4] Precautions on Handling······························································································· 44-1. Determining installation location··············································································· 44-2. Impact of granules··································································································· 4[5] Mounting······················································································································

45-1 Mounting direction···································································································· 45-2. How to mount the product························································································ 45-2-1. Standard specifications (G3/4” Tightening with a locknut)···································

45-2-2. N Type (Vane·Main shaft separate type)····························································· 55-2-3. F Type (Mounting with a flange)········································································· 5[6] Wiring··························································································································

56-1. Precautions on wiring·····························································································

56-2. Wiring procedure····································································································· 6[7] Detection Torque·········································································································

7[8] Replacing Internal Mechanisms····················································································

7[9] Operation Check Procedure·························································································

8[10] Paddle-Type Level Switch Problem Prevention···························································· 81[1] Operation Principle
The paddle-type level switch rotates a vane mounted on the main shaft with a motor. When noload is applied to the vane by the measurement target, the motor constantly rotates. When thevane stops rotating due to the measurement target, the switch stops the motor and delivers acontact output. At this time, the motor power source is set to shut off to protect the motor.
When the force stopping the motor rotation is removed, the power supply to the motor turns on
to rotate the motor, and the contact output switches. This operation detects the measurementtarget.

[2] Standard Specifications
2-1. Outline drawings
Vane Main shaft(Type: HL – 400)

WasherRubber packing Die-cast zinc

Die-cast zinc

Nut
O-ringFlat- to-flat diameterФ2 splitpin

Cord lock
Bimed

Lead wire

2-2. Specifications
Power supply voltage

AC 100/110 V 50/60 Hz or AC 200/220 V 50/60 Hz

Mounting Method

G3/4” (Tightening the base mounting plate with a locknut)

Power consumption

1.5 W

Contact output

1C Contact AC 250 V 5 A (Resistance load)

Detection torque (*1)

About 4.9 N·cm

Slip torque (*2)

About 11.76 - 14.70 N·cm

Number of rotations

1 rpm
Product body chassis and coverMaterials

Main shaft and vane
Sealing

Die-cast zinc

SUS304

Nitrile rubber

Ambient temperature Inside the tank 60°C max
during use

Outside the tank 55°C max

Pressure during use

Inside the tank 0 – 0.49 kPa

Painting color

Munsell 7.5GB4/15(*1) Detection torque is the torque value necessary to stop motor rotation.
(*2) Slip torque is a torque value at which the pullout mechanism is activated. The pullout
mechanism protects the motor when the vane experiences an overload or impact.
Individual specifications are provided separately. Please contact our sales representatives.

2[3] Type
HL－400None

Standard specifications

NVane·Main shaft Separate typeF

Flange mounting (Square 80 x 80 mm Mounting hole diagonal dimension
92 mm 4 – φ7.2 )HHeat resistance specification 100°C max.

HH

Heat resistance specification 150°C max.

S

Portion contacting granules SUS – 304 specification

G

Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)

GS

Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)
Portion contacting granules SUS – 304 specification

HS

Heat resistance specification 100°C max.
Portion contacting granules SUS – 304 specification

HHS

Heat resistance specification 150°C max.
Portion contacting granules SUS – 304 specification

HG

Heat resistance specification 100°C max.
Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)

HHG

Heat resistance specification 150°C max.
Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)

HGS

Heat resistance specification 100°C max.
Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)
Portion contacting granules SUS – 304 specification

HHGS

Heat resistance specification 150°C max.
Specifications for products with a protective tube (L – 150 to 300, in unitsof 50 mm)
Portion contacting granules SUS – 304 specification

None

Standard contact output 1C Contact AC 250 V 5A (Resistance load)Z

For small load application 1C Contact AC 250 V 0.1 A (Resistance load)

ZE

For small load application 1C Contact AC 250 V 0.1 A (Resistance load)
Equipped with a ground wire.

3

[4] Precautions on Handling
Caution4-1. Determining installation location
Mount the product in a location where granule levels actually vary.
<Mounting the product at the upper limit level> <Mounting the product at the lower limit level>
Wrong example

Correct example

Wrong example

Correct example

4-2. Impact of granule
If the product is mounted directly below the falling granules, the product may sometimes bedamaged by the impact caused by the collapse of the bridge phenomenon in the hopper.
Change the mounting position or provide a protective plate.
[5] Mounting
5-1. Recommended position of the mounting direction.
It is recommended that, for horizontal mounting, the cord lock face the direction as shown in
the figure below. This position provides stable detection operation because of the productstructure. Pay attention because setting the cord lock in the opposite direction may cause
malfunction of the rotation recovery failure when the spring position changes.
* Avoid using the product at the first position from “Weak” as much as possible.
<Product appearance viewing the vane to the<Product appearance viewing the cover at theleft>

front>A position where the cord lock is slanted by A position where the cord lock is slanted by25º - 30° from the bottom toward the front side 25º - 30° from the bottom toward the left side

LEVEL SWITCH

HL-400
RATED

AC 200/220V L- 85mm 250V 6A

SER.NOTOWA SEIDEN

5-2. How to Mount the Product5-2-1. Standard Specifications (G3/4” Tightening with a locknut)
Mount the product body after removing the vane by taking the split pin out of the vane portion.
After mounting the body, load the vane and fix it with the split pin. In fixing the vane, pay close
attention and handle the split pin properly so that it does not come off. After completing themounting, rotate the vane slowly half turn by hand until it reaches the position where it clicks.
Base mounting plate
VaneSplit pin

Main shaft

Outer diameter
about 26.5
Lock nut
WasherRubber packing45-2-2. N Type (Vane·Main shaft separate type)
Mount the product body after removing the main shaft portion from the product body byloosening the hexagonal cap nut. Pay close attention so that no foreign matter enters inside
the product body chassis because the chassis portion where the main shaft has been
separated has a hollow structure. After mounting the body, load the main shaft and tighten thehexagonal cap nut. Make sure that the nut is tightened fully. After completing the mounting,rotate the vane slowly one-half turn by hand until it reaches the position where it clicks.
Base mounting plate
Vane

Roll pin

Hexagonal cap nut

Connecting portion
to the body

Outer diameter
about 26.5
Lock nut
WasherRubber packing

5-2-3. F Type (Mounting with a flange)
Implement mounting after preparing the proper flange and packing referring to the figure below.
When mounting, pay close attention to avoid damaging the vane and lead wires. Aftercompleting the mounting, rotate the vane slowly one-half turn by hand until it reaches theposition where it clicks.

[6 ] Wiring6-1. Precautions on wiring
Warning During the wiring, make sure that the supply power sources and power sources
Warning

applied to the output are shut off. Failure to do so may result in danger of electric shock,electric leaks, and short circuits or combustion.
The power source voltage for this product is 100 V and 200 V exclusively. Check theWarning

identification label at the bottom of the product body cover to be sure to avoid any error.
Do not connect a load that exceeds the rating of the contacts. Doing so may cause damage orCaution

deterioration of the contacts. If the load capacity exceeds the ratings for the contacts, install arelay that meets the load capacity between the load and the output terminal of the product. Do
not connect the power supply directly to the relay output terminal without connecting a load.
Doing so may cause a short circuit or may damage the product. (Check the ratings of thecontacts found on the identification label on the bottom of the product body cover.)56.2 Wiring procedure
Check the product and select the wiring diagram that matches the product referring to the tablebelow before starting the wiring. The wiring diagram is also found on the identification label on
the bottom of the product body cover. * The wiring diagram corresponds to the status wherethe vane is rotating
H: Not conductive to C during vane rotation L: Conductive to C during vane rotation C: Common signal line

Equipped with 5P connector

5-core lead wirePowersource
Lead wire(Contact a)(Common)(Contact b)(Contact a)(Common)(Contact b)(Manufactured by Nanahoshi
Electric Mfg. Co., Ltd.)

Type ZE (Equipped with a small load groundwire)Type -6P (2-contact output)

To productbody

Lead wire(Contact a)(Common)(Contact b)

Lead wire(Contact a)(Common)Type -4PA (Equipped with a 4P connector)(Contact b)(Common)

Black

Green
RedWhite

Black
Green
RedWhite(Contact b)(Common)Type -3PB (3-core lead wire)

WhiteRedBlackWhiteRedBlack(Common)(Contact a)Power source

Power source(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)

Type -3PA (3-core lead wire)

WhiteRedBlackWhiteRedBlackGreenLead wirePower source(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)

Lead wire(Contact a)(Common 1)(Contact b)(Common 2)

Type -4PB (Equipped with a 4P connector)(Contact a)(Common)Lead wirePower source

Power source

Lead wireType -3PA (Equipped with a 3P connector)(Common)(Contact b)

WhiteRed(Common) PowerPower source

Lead wire

sourceLead wire(Contact b)(Contact a)(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)

Type -3PA (Equipped with a 3P connector, black leadwire)Type -3PB (Equipped with a 3P connector, blacklead wire)(Black)(Black)Power source

White(Common)(Contact a)

Red

Black

White

Red

Black

Lead wirePower source

Type -3PB (Equipped with a 3P connector)

Black

White

Red

Black

(Common)

White
Red
Black

For Particular Equipment Application

White

Power source

Red

Green
Black

White

Black

Red
Green

White
Red
Black
Green

Black
White
Red
Yellow
GreenBrown

Type -4PB (4-core lead wire)Type -4PA (4-core lead wire)

Lead wire

Black

Brown

(Ground)Power source

White
Yellow
Red
GreenBlack
White
Brown

Yellow

Red
Green

Lead wire

GreenBlack
White
Red
Yellow
Brown

Standard specifications

BlackRedPower source

WhiteGreenYellow

RedBlackWhiteGreenYellow
Lead wire

BlackWhiteRedYellow
GreenPower
Lead wire(Common) source(Contact b)(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)(Manufactured by Nanahoshi Electric Mfg. Co., Ltd.)6

[7] Detection TorqueIf you need to increase the detection sensitivity because of apparent relative density or theheap condition of the material, then increase the vane dimension. When changes in the vane
shape are difficult due to the shape of the hopper, then increase the detection sensitivity by asmall amount by shifting the spring position located at the back of the internal mechanism
toward the “Weak” direction. In shifting the position, pay particular attention not to deform thespring. Failure to do so may cause malfunction of the product. In the case of vertical mounting,
do not shift the spring position toward the “Weak” direction. Doing so may cause a malfunctionof the rotation recovery failure.
* Avoid using the product at the first position from “Weak” as much as possible.
<Spring position by default>*Do not change the spring position inthe vertical mounting.

[8] Replacing Internal MechanismsWarning During internal mechanism replacement, be sure that the supply power sources andWarning

power sources applied to the output are shut off. Failure to do so may result in danger ofelectric shock, electric leaks, and short circuits or combustion.
1) Remove the cover. The cover has a threaded mounting for the chassis.
2) Loosen the lead-holding portion of the cord lock. (Have the wiring removed in advancesince the entire lead wire is replaced.)
3) Remove the internal mechanism. Use the proper Phillips screwdriver to remove theinternal mechanism, which is attached to the chassis with two M4 screws.
4) Pull the internal mechanism toward you to remove it along with the lead wire.
5) Prepare the replacement internal mechanism. Run the lead wire from inside the chassis
through the cord lock, adjust the coated portion of the lead to the rear end of the cord lock,and then secure the lead wire. During this work, pay attention not to damage the lead wire.
Also, pay attention not to twist the conducting wires.
6) Fit the motor output portion of the internal mechanism into the motor junction portion andsecure the internal mechanism with screws. In the attachment process, pay close attention
to avoid pinching, twisting, or forcibly attaching the conductor wires.
7) Mount the cover.
Motor output portion
Motor connecting portion

Mechanism mounting holeM4 x 8 screws used (at 2 points)
Product body cover

Product body chassis

Coating treatment portion
Cord lockLead holding portion

Conductor
Internalwire mechanism
Attached to thechassis with screws

Lead wire7[9] Operation Check Procedure
1) Check whether the wiring is correctly connected.
2) Turn the power on.
3) Check that the vane rotates smoothly.
4) Check that the signal switches when the vane is held by hand or completely buried in themeasurement target. (2–3 times during one rotation)5) Rotate the vane by hand and check that the vane runs idle and clicks at the position afterrotating 180°. (Check slip mechanism operation)[10] Paddle-Type Level Switch Problem Prevention
1) Do not expose the switch body to impacts.
2) Check that the vane, main shaft, and protective tube have no bends.
3) Pay attention to tighten the cover to prevent intrusion of rainwater or dust.
4) Check that no measuring object adheres to the vane and main shaft.

5) Do not deform the spring during the detection torque adjustment. Doing so may makedetection impossible.
6) In detection torque adjustment, avoid the first position from “Weak” as much as possible.
7) Be sure to connect the correct power source voltage.
8) Do not mistake the power wire and output wire when wiring.
9) Do not apply current in excess of the ratings to the output contact or do not short circuit theoutput contact.
10) When wiring, use the proper crimp terminals to prevent the wires from coming off.
11) When performing terminal treatment of the lead wire, pay close attention to avoid
damaging the conductors and coating.
Examples of abnormality in detection operation (outline)
Level switch defective state
Abnormal state

Material in the tank
Main shaft rotation

Signal does not switch

Thetoformed

has

1.

Power source · voltage

bridge,2.

Defective motor

material

Signal switching
1.

Contact

failureofthedirection

identifying

thecreating a hollow near

existence of material

the vane, resulting incontacts due to excess

despite its existence.

idling of the vane.

current

Signal does not switch

Material adheres totoa

microswitch contacts
2.

1.

Recovery action failure

thedirection

the tank wall and thedue to clogging at theidentifying

thevane, forming a heap.

sealing portion.

non-existenceofmaterial

its

despitenon-existence.

2.

Defective

recovery3.

Bent main shaft

4.

Deformed product bodyContact

failureof

microswitch contacts2.

spring8

1.

Burnout of microswitch

Burnout of microswitch
contacts due to excess
current