EBARA DSC4 User Manual

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CT 259-08-09

As informações contidas neste manual poderão sofrer alterações sem prévio aviso.

Manual de Instruções

Modelo DSC4

Depto. Comercial São Paulo

Rua do Rócio, 84, 8º andar Vila Olímpia - São Paulo - SP Fone: (11) 2124 7744 Fax: (11) 2124 7745 e-mail: saopaulo@ebara.com.br

Depto. Comercial Recife

Av. Mal. Mascarenhas de Morais, 1776 Loja 04 - Imbiribeira - Recife - PE Fone: (81) 3087 1190 Fax: (81) 3471 1533 e-mail: recife@ebara.com.br

www.ebara.com.br

Depto. Comercial e Fábrica

Rua Joaquim Marques Figueiredo, 2-31 Bauru - SP Fone: (14) 4009 0020 / 4009 0000 Fax: (14) 4009 0011 e-mail: bauru@ebara.com.br

Assistência Técnica

Rua Joaquim Marques Figueiredo, 2-31 Bauru - SP Fone: (14) 4009 0024 Fax: (14) 4009 0022 e-mail: assistencia@ebara.com.br

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Contents

1. Preface …………………………………………..……….....................….………..

2. Acceptance Inspection ……………………………………......................…...…..

3. Installation ………………………………………..………………......................….

3.1 Foundation ….………………………………..…………........................…..

3.2 Floor Frame ……………………...…………..………………..........………..

3.3 Discharge Elbow Installation ……………………………….….........……..

3.4 Discharge Pipe Installation ...………………...…………..........….………..

3.5 Water Level Switch Installation …………………………….……..........…..

3.6 Check the Following Points (1) Through (6)

Prior to Pump Installation ……………...……………………...….........…..

3.7 Pump Installation ……………………………....…………..…...............…..

3.8 Cable Installation ………………………………………………..............…..

3.9 Floor Plate ……………………………………………..……............…...…..

4. Electric Wiring ………………………………………………….……...............…..

4.1 Power Cable Connection ………………………………….…...........……..

4.2 Grounding ……………………………….…………………...........………...

4.3 Protective Device Cable Connection …………………….............………..

4.4 Water Level Switch Cable Connection …….…………….…............……..

5. Operation ……………………………………………………..............…..………..

5.1 Operational Limitations ………………………………...…............………..

5.2 Checking Rotation Direction …………………………………...........……..

5.3 Cautions for Operation ……………………………….………...........……..

5.4 Operation ……………………………………………….……...........……….

5.5 Cautions During Operation ………………………………............…………

6. Maintenance and Overhaul …………..………………….…...…...............……..

6.1 Daily Checks …………..……………………………………............……….

6.2 Monthly Checks …………..…………………...…………..........…………..

6.3 Annual Checks …………..…………………...…………….……….............

6.4 Overhaul …………..…………………...…….………………..............……..

6.5 Disassembly and Reassembly …………..………..............…….….……..

6.6 Replacing Components …………..………………...…...........….….……..

7. Troubleshooting …………..…...............………………...…….…………….….....

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INSTRUCTION MANUAL

Model

DSC4

Page 4

INSTRUCTION MANUAL

Model

DSC4

1. Preface

Design of this EBARA pump is based on superior engineering and long experience. To prevent trouble and provide satisfactory operation and long life, it is important to understand the EBARA pump thoroughly by careful study of this manual. If any questions arise regarding this manual, please direct them to EBARA. Your questions will be promptly answered and your suggestion may be considered for incorporation into our future products.

CAUTION: THIS INSTRUCTION MANUAL INCLUDES NECESSARY ITEMS FOR

INSTALLATION, OPERATION AND MAINTENANCE. READ THIS MANUAL CAREFULLY TO ENSURE CORRECT INSTALLATION, OPERATION AND MAINTENANCE. BE SURE TO KEEP THIS INSTRUCTION MANUAL ON HAND FOR FUTURE REFERENCE.

Safety Labels

Four different types of safety labels are used in this manual. Please study the labels carefully so that the meaning of any safety warning you encounter is immediately clear.

DANGER: indicates a potentially hazardous situation which, if not avoided, will result in death or serious injury.

WARNING: indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury

CAUTION: indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or possible damage to the equipment or machine.

Note: is used to call attention or to emphasize essential information.

2. Acceptance Inspection

Upon arrival of the pump – (1) Check the nameplate information for agreement with speciﬁ cations in respect to model identiﬁ cation, head, pumping capacity, speed, output, voltage and frequency. (2) Check the pump has not been damaged during shipment and all plugs and fastening bolts properly tightened. (3) Check accessories and spare parts against the packing list. If any problem is found, contact your dealer.

INSTRUCTION MANUAL

Model

DSC4

7. Troubleshooting

Symptoms Probable Causes Remedies

Pump fails to start • Defective cable or motor.

• Malfunction inside control panel.

• Power source trouble.

• Pump is mechanically locked.

• Defective protector.

• Lifts pump and replace cable or motor.

• Inspection made by competent electrician.

• Lift pump, inspect and/or overhaul.

• Replace protector.

Pump fails to function despite motor operation

• System head too high.

• Clogged discharge pipe (Pressure too high).

• Clogged pump or strainer (Pressure too low).

• Wrong direction rotation.

• Internal pump wear.

• Valve is closed.

• Recheck requirements.

• Clean discharge pipe.

• Clean strainer or impeller and casing.

• Check and change rotation. Transpose two of three phase leads at panel.

• Repair and/or replace.

• Check valve operation.

Insufﬁ cient capacity • Air suction.

• System head too high.

• Clogged discharge pipe. (Pressure too high)

• Clogged pump or strainer. (Pressure too low)

• Air accumulation in pipe.

• Internal pump wear.

• Wrong direction rotation.

• Liquid viscosity different from design value.

• Damaged impeller.

• Raise water level in pump pit.

• Recheck requirements.

• Clean discharge pipe.

• Clean strainer, impeller and bowl.

• Install air vent valve.

• Repair and/or replace.

• Check and change rotation. Transpose two of the three phase leads at panel.

• Recheck requirements.

• Repair and/or replace

Excessive current • Gravity of pumped liquid greater

than that speciﬁ ed.

• Sand mixed with water.

• Refer to “Pump fails to start”

• Change pump unit.

• Lift the pump and overhaul. Remove sand in tank.

Vibration and/or noise • Internal pump wear.

• Clogged pump.

• Cavitation or vortex.

• Resonance in pipe line or foundation.

• Rotating component in contact with ﬁ xed component.

• Damaged impeller.

• Repair and/or replace.

• Clean pump.

• Raise suction water level. Operate at proper ﬂ ow rate.

• Repair to change characteristic vibration.

• Internal pump check. Repair and/or replace.

• Repair and/or replace.

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INSTRUCTION MANUAL

Model

DSC4

Fig. 24

(4) Torque table

Table 4

WARNING: WHEN MACHINES SURFACES ARE DAMAGED AND MUST BE REPAIRED, USE AN APPROPRIATE GRINDER. DURING GRINDING WORK, APPROVED PROTECTIVE GOOGLES MUST ALSO BE WORN.

Bolt Size

Torque kg.m (Ft.lbs.)

Without anti seized

compound

With anti seized

compound

M8 1.1 (8) 0.8 (6) M10 2.2 (16) 1.5 (11) M12 3.8 (28) 2.6 (18) M16 9.1 (66) 6.2 (45) M20 17.8 (129) 12.1 (88) M22 24.0 (174) 16.2 (117) M24 30.8 (223) 20.9 (151) M30 61.4 (444) 41.6 (301) M36 107.0 (774) 72.4 (524)

INSTRUCTION MANUAL

Model

DSC4

3. Installation

3.1 Foundation

Place concrete to build up the ﬂ oor and discharge elbow foundations to the values shown in installation drawing. The discharge elbow foundation must have sufﬁ cient size and strength to support the weight of the pump body, submersible motor and accessories plugs the weights of the discharge pipe, and to absorb vibrations and impacts resulting from operation. Usually, it should weigh more than seven times the pump weight.

3.2 Floor Frame (Fig. 1, 2 and 3)

Install a cable lead-out elbow and a ﬂ oor frame on the ﬂ oor over the pump pit. Attach a guide pipe holder securely to the ﬂ oor frame with bolts. As the guide pipe must be installed vertically (with a tolerance of 1mm or less per 1m), carefully check the positional relationship between the ﬂ oor frame location and the discharge elbow foundation. (See Fig. 1 * )

If the guide pipe holder is attached directly to the concrete, use hole-in anchor bolt as shown in Fig. 3.

CAUTION: IF THE CABLE LEAD-OUT ELBOW IS TOO SMALL IN DIAMETER, THE CABLE MAY BE HEATED WHERE IT RUNS THROUGH THE ELBOW.

Motor side

Impeller side

Cable lead-out elbow

Fig. 1

Fig. 2 Fig. 3

Hole-in anchor bolt

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INSTRUCTION MANUAL

Model

DSC4

3.3 Discharge Elbow Installation (Fig. 4)

WARNING: WHEN LIFTING THE PUMP, USE APPROPRIATE CRANE (OR HOIST) AND LIFT SYSTEM. CHECK POSITION AND TIGHTNESS OF LIFT SYSTEM SO THAT WEIGHT OF THE PUMP IS NOT UNBALANCED. FAILURE TO OBSERVE THIS PRECAUTION CAN RESULT IN SERIOUS ACCIDENTS.

Install the discharge elbow level on the bottom on the pump pit, and connect the guide pipe.

Support the guide pipe with bushings on discharge elbow and the guide pipe holder. If the guide pipe requires a length exceeding 5.5 m, an extension or intermediate support may become necessary, in which case we are available for consultation. When installing the discharge elbow, the guide pipe must be vertical (with a tolerance of 1mm or less per 1m), using a plum bob. If it is not vertical, it may become impossible to lift pump. Discharge elbow level should be with in

0.1 mm per 1 m, both in the “X” and “Y” directions shown in Fig. 4. It is recommended practice that pipe installation be carried out with the discharge elbow covered to protect against entry of concrete and mortar during the work.

CAUTION: FIX THE ARCHOR BOLTS TIGHTLY BY, FOR EXAMPLE, BY WELDING THEM TO THE REINFORCEMENT BAR, ETC.

INSTRUCTION MANUAL

Model

DSC4

(2) Impeller disassembly

Remove the impeller bolt cap and impeller bolt with special tools. Remove the impeller with Special pull out tool. (Refer to Fig. 23)

Fig. 23

(3) Mechanical seal replacement (Refer to Fig. 24)

(a) Remove the snap ring (A) from intermediate casing. (b) Remove the mechanical seal by using push bolts (B).

For assembly, reverse the above steps. After installing the mechanical seal, ﬁ ll the threads (C) with the silicon-rubber sealant (SHIN-ETSU CHEMICAL Co., Ltd. KE-45 or equivalent).

CAUTION: DO NOT COMPLETELY DISASSEMBLE THE MECHANICAL SEAL.

IMPELLER

Special pull out tool

Bushing

Fig 4

(Left hand screw)

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INSTRUCTION MANUAL

Model

DSC4

(2) Protect surfaces of mating ﬂ anges and the corners of spigot and socket. (3) Cover the shaft threads to protect from damage after disassembly. (4) After disassembly, apply temporary rust prevention to the machined surfaces such as

lifted surfaces, threads, shafts, etc. (5) Be careful not to drop tools and parts into the sump pit. (6) To protect against lost parts and mixing of parts with those from another machine,

provide cases for disassembled parts and store parts in cases. (7) Store bolts in bags as a set. (8) Do not disassembly the motor. If the motor requires disassembly, please contact us.

6.6 Replacing Components

(1) Changing oil

Stand the pump in a vertical position, and unplug “oil drain” and “air vent”. Drain all oil

from the “oil drain” (In case of model “F” and “G”, using the oil pump.)

Fig. 22

Inspect the oil for water contamination. If the oil contains much water, mechanical seal must be replaced. After the oil has been inspected, pour oil (Turbine Oil ISO VG 32) through the “oil port”, until oil overﬂ ows from “air vent”. Put a sheet gasket between the plug and the boss, and tighten the plug. (Refer to Para. 3.6.1)

Oil reservoir

Oil pump (In case of model "F" and "G

Floor surface

Mech. Oil drain

INSTRUCTION MANUAL

Model

DSC4

3.4 Discharge Pipe Installation (Fig. 5)

When mortar under discharge elbow has been sufﬁ ciently set, proceed with piping to the discharge side.

CAUTION: DURING THIS WORK, TAKE CARE NOT TO SUBJECT THE DISCHARGE ELBOW TO EXCESSIVE WEIGHTS.

3.5 Water Level Switch Installation (Fig. 6)

Install a water level switches for use during automatic operation. If a ﬂ oat type switch is used, each pump will required a total of 3 (or 4) for starting, stopping, (low level alarm) and high-level alarm.

Fig. 5

Above low limit level

Fig. 6

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INSTRUCTION MANUAL

Model

DSC4

3.6 Check the Followings Points (1) through (6) Prior to Pump Installation

(1) Ensure that the mechanical seal chamber is ﬁ lled with speciﬁ ed amount of oil. (2) All plugs and fastening bolts are properly tightened. (3) The sealing chamber is not leaking. (4) The pump is not damage and the cable glands and cables are in satisfactory condition. (5) Insulation resistance values are within limits. (See 3.6.2) (6) Other points that require particular attention. (See 3.6.3)

3.6.1 Oil Supply (Fig. 7, 8 and 9)

The motor shaft is sealed with a tandem mechanical seal. The seal chamber provide between the two sealing stages can be ﬁ lled with turbine oil by standing the pump vertically and unplugging “oil port” and “air vent”.

CAUTION: THE SEAL CHAMBER MAY BE UNDER PRESSURE. HOLD A RAG OVER THE OIL PLUG TO PREVENT SPPLATTER.

Pour the speciﬁ ed oil into the sealing chamber through the “oil port” until the oil ﬂ ows out of the “air vent”. (See Table 1) After the sealing chamber is ﬁ lled to the speciﬁ ed level, put a sheet gasket between the plug and the boss, and tighten the plug.

INSTRUCTION MANUAL

Model

DSC4

6.5.1 Preparation for Disassembly and Reassembly

An adequate workspace should be found which is as wide as possible, and has a rigid ﬂ oor. The area should be safe from hazards. The following should be prepared before disassembly and reassembly.

• Lifting devices.

• Wooden supports and pads.

• Standard tools.

• Special tools.

• Teﬂ on tape or liquid packing.

• Rags.

WARNING: DURING DISASSEMBLY AND REASSENBLY, BE SURE TO USE APPROPRIATE

CRANE (OR HOST) AND WIRE ROPES. USE OF IMPROPER CRANE AND WIRE ROPES CAN RESULT IN SERIOUS ACCIDENTS. FAILURE TO OBSERVE THIS PRECAUTION CAN RESULT IN SERIOUS ACCIDENTS.

6.5.2 Cautions for Disassembly

(1) Cautions for unloading products

(a) When hoisting heavy loads such as the pump proper, pay careful attention to attaching the sling so that the load will be centered and the sling does not slip. (b) When lifting heavy parts, use soft padding under the wire to protect the coated and machined surfaces. Do not raise or lower the parts too rapidly with the crane. (c) When assembling components on the ﬂ oor, use protective blocks under the components to protect the coated surfaces and prevent rolling.

Fig. 21

Mech. Oil port

Mech. Air vent.

Mech. Oil port

Fig. 7 Fig. 8

Protective blocks

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Model

DSC4

(4) Rotor

(a) After checking the oil, put your hand through the pump discharge and turn the impeller.

If it turns smoothly, the rotating components should be in satisfactory condition.

(b) If the impeller resists or feels locked, the pump requires overhaul.

6.3.3 Reinstallation

After the pump has been thoroughly inspected, reinstall it by reversing the lifting procedure. If dirt is caught in the elbow, lift the pump back a little and operate pump for 2 or 3 seconds to blow off the dirt.

6.4 Overhaul

Whenever the pump requires overhaul due to operational problems, poor insulation or as a result of inspection, returns it to us for the job. Pumps should be overhauled for general inspection every second year to prevent major troubles even if there are no apparent problems.

(1) Cable disposition

When the pump is lifted for overhaul, it is necessary to disconnect all cables from the

control panel terminal board. At this time, if the cables are pulled out from the ﬂ oor-level

elbow, reinstallation becomes difﬁ cult.

To prevent this, pull the cables with their ends tied with string. When the cables are put

back into their original position after overhaul, tie the cables ends again with the same

string and pull from the opposite side. (2) Details of overhaul

Overhaul consists of the following work (to be done at our shop) :

(a) Complete disassembly, inspection and cleaning of pump.

(b) Inspection of starter coil and insulation test.

(d) Functional tests.

(e) Performance tests. (If required)

6.5 Disassembly and Reassembly

WARNING: WHEN DISASSEMBLING THE PUMP, WARNING SIGNS MUST BE POSTED NEARBY TO PREVENT MISOPERATION BY THIRD PARTIES. FAILURE TO OBSERVE THIS PRECAUTION CAN RESULT IN DAMAGE OR SERIOUS ACCIDENTS.

WARNING: DURING PUMP DISASSEMBLY AND REASSEMBLY, ENSURE THAT THE CABLES ARE DISCONNECTED AND ISOLATED FROM THE POWER SUPPLY.

INSTRUCTION MANUAL

Model

DSC4

Use one of the following oils or equivalent.

Shell : Turbo oil T32 Mobil : Mobil DTE oil light Esso : Esso Tresso 32 Exxon : Teresstic 32 Gulf : Harmony 32, Crest 32 Caltex : Rega Oil R&O 32

Table 1

PUMP

MODEL

CODE

APPROX.

OIL CAPACITY

(LITER)

PUMP

MODEL

CODE

APPROX.

OIL CAPACITY

(LITER)

150DSC4 AO-46075

2.4

300DSC4

FO-66060 FC-66060

2.4

150DSC4

AO-46060 AC-46060

300DSC4

FO-66050 FC-66050

150DSC4

AO-46050 AC-46050

300DSC4

GO-66075 GC-66075

2.3

150DSC4 BC-46120 2.4 150DSC4

HO-46075 HC-46075

3.2150DSC4 BC-46100 3.1 150DSC4

HO-46060 HC-46060

150DSC4 CC-46145 3.2 150DSC4

HO-46050 HC-46050

250DSC4

EO-66145 EC-66145

3.9250DSC4

EO-66125 EC-66125

250DSC4

EO-66100 EC-66100

Turbine Oil ISOVG32

Oil funnel

Floor surface

Fig. 9

Page 10

INSTRUCTION MANUAL

Model

DSC4

3.6.2 Insulation Resistance Measurement

WARNING: ALL ELECTRIC WORK SHOULD BE PERFORMED BY A QUALIFIED ELECTRICIAN AND ALL NATIONAL AND LOCAL ELECTRICAL CODES MUST BE OBSERVED.

Although insulation resistance of this pump has been shop tested, it should be rechecked prior to installation, using the following procedure. Usually, insulation resistance of a minimum of 50MW is considered satisfactory (when measured with a DC 500V Megger). Measurement procedure (Refer to Figs. 10 and 11) Connect the minus (-) terminal to G of the DC 500V Megger to the G terminal of the power cable, or a motor bolt. Touch the plus (+) terminal of the Megger to L1-phase (or L2-phase or L3-phase) of the power cable, and read the insulation resistance. Touch the plus (+) terminal of the Megger to P1 (or P2) and P3 (or P4) of the protective device cable, with the minus (-) terminal G connected as above, and read the insulation resistance.

CAUTION: DO NOT CONNECT THE TWO MEGGER TERMINALS BETWEEN P1 AND P2 OR P3 AND P4, TO AVOIDDAMAGE TO THE PROTECTIVE DEVICE. KEEP THE CABLES OFF THE GROUND WHILE TAKING ALL MEASUREMENTS.

INSTRUCTION MANUAL

Model

DSC4

Fig. 20

(3) Mechanical Seal (lower)

(a) Unplug the “oil drain” and “air vent” and drain all internal oil. (Refer to “Changing Oil”, Para 6.6). (b) If the drained oil is muddy, or milky-white, it contains water. The mechanical seal (lower) is in satisfactory condition as long as the oil does not contain much water. Otherwise, it must be replaced. (c) After the oil has been inspected, pour fresh oil (Turbine Oil ISO VG32) through the “oil port”, with the pump in a vertical position, till oil overﬂ ows from the “air vent”. The quantity of oil is shown in Table 1. (d) Replug the “oil port” as carefully as the other ports. (e) To replace either upper or lower mechanical seal, the pump must be disassembled. As the mechanical seal is a cartridge type, removing the retaining ring permits seal removal as a complete assembly. After the mechanical seal has been replaced with a new one, reassemble the pump and supply the speciﬁ ed oil through the “oil port” in the manner describe above. At this point, turn the rotating body by hand to ensure that it turns smoothly. Also, check for oil leaks.

Check hole plug

Oil port plug

ir vent hole

plug

Oil drain plug

Mechanical seal

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INSTRUCTION MANUAL

Model

DSC4

6.3.1 Steps for Lifting Pump

(1) Remove the ﬂ oor plate. Hook the lifting chain on the hoist or motor-driven chain block. (2) Simply lift the whole pump body slowly as that is all that is required for lifting the pump.

It is not necessary to empty the pump pit, or remove any bolts. (3) If the guide pipe is deposited with dirt and the pump cannot be slip up along it

smoothly, do not lifting using force but clear the pipe of dirt with a stick, etc.

6.3.2 Inspection Procedure

(1) Appearance check

Check the impeller, cables, bolts and nuts, external surface conditions for abnormal

conditions.

CAUTION: THE SEAL CHAMBER MAY BE UNDER PRESSURE. HOLD A RAG OVER THE OIL PLUG TO PREVENT SPLATTER.

(2) Mechanical seal (upper)

(a) Lift the pump out of the pump pit by lifting procedure described above, and stand it

on the ﬂ oor in a vertical position. Unplug the “leak check” in the intermediate casing of

the pump.

(b) If neither oil nor water leaks form the “leak check”, the mechanical seal (upper) is in

satisfactory condition.

containing water, in excess of 1 liter (after one year of use), leaks out the mechanical seal

must be replaced.

(d) If much water is emitted, the mechanical seal or others components may be damaged,

and an overhaul is necessary.

(e) When inspection is completed, put a sheet gasket between the plug and the boss,

and tighten the plug.

INSTRUCTION MANUAL

Model

DSC4

Power cable

Protective device cable

P2 P1

DC 500V Megger

Fig. 10

L1 L3

Power cable

Motor

Protective device cable

Fig. 11

Page 12

INSTRUCTION MANUAL

Model

DSC4

3.6.3 Other Checks Requiring Particular Attention

(1) Minimum operating water level

Be sure that the pump stop level is not lower than the minimum operating water level

speciﬁ ed in the technical document. If the stop level is lower, a vortex ﬂ ow can occur

causing the pump to intake air, resulting in noise and vibration.

If there is possibility that the minimum water level may decrease to an excessive extent,

it is necessary to use a minimum water level may decrease to an excessive extent; it is

necessary to use a minimum water level alarm. An alternative measure would be a water

level-dependent automatic control system where the motor is turned off to automatically

stop the pump with the water lowered to a critical level and is turned on again to resume

automatic operation when water is restores to a safe level. (2) Pump location relative to pump pit water inlet

If the pump is installed near the pump pit water inlet, it can be considerably disturbed;

it can be shaken and the cables whipped by vigorous inlet water, resulting in damage.

Therefore, the pump should be located as far from the water inlet as possible. (3) Size of debris

Entry of large or long debris can result in a blocked impeller.

If such problem actually occurs, the pump can be readily lifted out and disassembled for

servicing, which is however, time and labor consuming.

The primary consideration therefore should be to prevent the ingress of any oversized

objects into the sump by use of a screen, etc. Another important consideration is to

minimize presence of abrasive substances, such as sand, in the liquid.

If the contents of such substances becomes high, the impeller is increasingly worn,

leading to the degradation of capacity.

Note: In case any problem as above actually takes place, contact us immediately.

INSTRUCTION MANUAL

Model

DSC4

6. Maintenance and Overhaul

While the life of the pump depends largely on the ambient conditions, daily servicing and inspection helps extend service life considerably. To achieve that, carry out the maintenance as follows:

6.1 Daily Checks

Check the following items at least once a week.

(1) Current

If the ammeter reading exceeds the motor rating listed on the data plate or is abnormally lower than usual, it is an indication of a problem.

(2) Voltage

Voltage should be within ± 10% of the rated value throughout operation.

(3) Vibration

Check for the abnormal vibrations.

(4) Protective devices

Check protective devices by reading the panel indicator.

6.2 Monthly Checks

Check the following items at least once a month.

(1) Discharge pressure

Check pump discharge pressure and discharge ﬂ ow rate (if ﬂ ow meter is provided).

(2) Insulation resistance

Operation is safe as long as insulation resistance is more than 2MW. If higher than 2MW, but this occurs after a sharp decline form a certain value, check the cables, and / or overhaul is required.

6.3 Annual Checks

Even if there is nothing wrong with the pump under normal service condition, it should be lifted out and inspected once a year at least. Particularly, when the pump is in use under severe conditions, such as where the liquid being handled contains sand or is corrosive, or oversized debris is pumped through, inspect it as often as circumstances allow. A recommended procedure for inspection is outlined below. If mechanical seal must be replaced or on overhaul is considered necessary as a result of the inspection, contact nearest dealer, or us directly.

WARNING: BEFORE PULLING THE PUMP, DISCONNECT ALL CABLES AND ENSURE THAT THE PUMP IS ISOLATED FROM THE POWER SUPPLY.

WARNING: ALWAYS LIFT THE PUMP BY THE LIFTING LUGS, NEVER BY THE MOTOR CABLE.

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CAUTION: SINCE THE STARTING TORQUE ON LARGE PUMPS CAN BE POWERFUL, THE PUMP MUST BE SUPPORTED.

DANGER: DURING CHECKING THE DIRECTION OF ROTATION, DO NOT TOUCH ROTATING PARTS OF THE PUMP. KEEP HANDS, HAIR AND TOOLS AWAY FROM ROTATING PARTS TO PREVENT SERIOUS ACCIDENTS.

5.3 Cautions of Operation

Closed valve operation of the pump is no problem if operating is not prolonged. Otherwise, the pump not only becomes overheated but also is caused to rattle and vibrate by backward ﬂ ow of the liquid at the suction port. Avoid closed valve operation as much as circumstances allow.

5.4 Operation

(1) Starting

• Open the valve if provided.

Note: A pump of lower shut off power than rated horse power may be started with the valve closed. In such case, open the valve within 1 minute after motor start.

• Start motor

CAUTION: DO NOT START THE MOTOR IF REVERSE FLOW OCCURS.

(2) Stopping

• Stop motor

Note: A pump of lower shut off power than rated horse power may be stopped just after the valve is closed.

5.5 Cautions During Operation

Pay attention to abnormal noise and vibration. If air or foreign matter enters the pump or if there is a change in the operating point, mis-operation or valve defect in the discharge lines, abnormal noise and vibration can occur. Pump discharge pressure can also vary greatly or the current meter of the motor can vary suddenly during operation. In such cases, immediately check to ﬁ nd the cause of these problems.

INSTRUCTION MANUAL

Model

DSC4

3.7 Pump Installation (Fig. 12)

After the pump has been thoroughly checked to verify that it is in order, lift the pump body and ﬁ t the sliding guide of the pump body to the guide pipe. Then, lower the pump body slowly along the pump guide. The pump is automatically connected to the discharge elbow. If the pump cannot be slid down smoothly, the guide pipe may not be vertical or the lifting method may be wrong. Check these points to determine the cause for correction. After the pump is installed attach the chain to the hook of the ﬂ oor frame.

When the pump is installed indoors, it should be a good idea for convenience’s sake that a hoist, for example, be provide on the ceiling so that it can be moved to the pump lifting center when necessary.

SLIDING GUIDE

CHAIN HOOK

GUIDE PIPE

DISCHARGE ELBOW

Fig. 12

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DSC4

3.8 Cable Installation (Fig. 13)

When the pump has been installed, pull out the power cable, protective device cable, water level switch cable, etc. from the cable lead-out elbow on the ﬂ oor and connect them to the control panel.

CAUTION: HANDLE THE CABLES VERY CAREFULLY. IF THEY ARE BENT OR PULLED EXCESSIVELY, THE CABLE AND THE MOLDED SEAL MAY BE DAMAGED, RESULTING IN INSULATION FAILURE. ALSO, CARE IS NEED TO PROTECT CABLE ENDS AGAINST WATER INTRUSION.

Note: The cables should be cut to the necessary length.

If the cable is too short, it can prevent lifting of the pump. If the cable is too long and laid loose on the pump pit bottom, it could be sucked into the pump. If left coiled on the ground, it could be locally heated.

3.9 Floor Plate

Finally, install the ﬂ oor plate over the pump pit, and the installation work is ﬁ nished.

INSTRUCTION MANUAL

Model

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Fig. 18 Pump performance for Normal Rotation

Fig. 19 Change of Connections for Normal Pump Performance

WARNING: CHOCK THE PUMP TO REDUCE THE TORQUE PRODUCED BY A LARGE SIZED PUMP.

(2) If the pressure gauge or compound pressure gauge is not installed on discharge pipe.

If checks of the rotating direction of the pump in the water as described above cannot be performed, proceed as follows. Lay the pump on the ground. Turn switch on and off instantaneously, and check visually the rotation direction through the discharge bore of the pump. The rotating direction of the pump should be clockwise when viewed form above.

CABLE LEAD-OUT ELBOW

FLOOR PLATE

(Head)

Total head (H1 + H2) m

1L2L3L

Shaft output (Amperage)

Total head

Solid line : Normal Broken line : Reversed

Rated output (Rated amperage)

(Capacity)

L1 L2 L3

Fig. 13

L3L1 L2

MotorMotor

3L1L2L

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5. Operation

5.1 Operational Limitations

This pump is designed to operate under the following conditions:

(1) Liquid temperature : max. 40ºC (105° F) (2) Liquid : This pump must not be used with sea water and corrosive chemicals or

combustible liquids. (3) Lowest liquid level : Refer to lowest liquid level shown in the technical document. (4) Voltage variations : The motor is designed to supply its rated output at variations of up

to±10% of the rated voltage at the rated frequency. (5) Voltage balance : Balance among the supply phases should not exceed deviations in

excess of±1%. (6) Frequency variations : The motor is designed do supply its rated output at variations of

up to +3% / -5% of the rated frequency at the rated voltage. (7) Frequency of starts : The pump should not be started in excess of 10 times per hour.

5.2 Checking Rotation Direction (Figs. 18 and 19)

Check the motor for rotation direction by the following procedure after the pump has been installed in the pump pit. A reversing pump is no problem if operation is not prolonged.

(1) If the pump performance curve is available.

Open the sluice valve on the discharge side approximately half a turn (so that air is

released and a small quantity of liquid is discharged), and turn the main switch ON. With

all air released from the discharge pipe, fully close the sluice valve.

As this time, if the value of shut-off head (H1 + H2) (m),

where

H1 (m) Compound pressure gauge reading

H2 (m) Vertical distance from gauge to liquid surface

is generally in agreement with the pump performance at hand, the pump is operating

normally.

If the pump is reversed, a performance curve as denoted by dashed lines in Fig. 18 is

usually obtained, where the pump’s discharge pressure is lower than normal or speciﬁ ed,

and a sudden rise electric current occurs with gradual opening of sluice valve.

In this event, change connections as shown in Fig. 19.

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Model

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4. Electric Wiring

4.1 Power Cable Connection

WARNING: CHECK THAT THE POWER IS LOCKED OFF AND DISCONNECTED BEFORE WORKING ON PUMP.

The electric wiring for a submersible motor is no different from that of an ordinary motor, except that the direction of rotation cannot be easily veriﬁ ed. Wiring to wrong terminals results in a reversed motor, and to prevent this and to achieve best results, the following wiring procedure is recommended. Connect terminals L1, L2 and L3 to the secondary terminals L1, L2 and L3 of the electromagnetic switch or breaker respectively. Connect the remaining terminal G to ground.

WARNING: WHEN PREPARING POWER CABLE LEADS FOR CONNECTION TO CONTROL, IT IS ESSENTIAL THAT THE GROUND LEAD BE LONGER THAN THE POWER LEADS. THE GROUND LEAD MUST HAVE AT LEAST 2” (50 MM) SLACK REMAINING AFTER CONNECTION, WHEN SPACE PERMITS. THIS IS DONE FOR ELECTRICAL SAFETY. IF THE CABLES IS MISTAKENLY PULLED OUT, THE GROUND LEAD WILL BE THE LAST WIRE BROKEN.

4.2 Grounding (Fig. 14 and Table 2)

Be sure to connect the ground line (labeled “G”) to ground. Prior to grounding, ensure that the wire is the speciﬁ ed one (labeled “G”). Also, verify that grounding continuity has been established inside the motor by checking that ground wire (labeled “G”) is electrically conductive with the bolt on the top of the motor (to be stripped of paint). Ground the motor according to local codes.

L1 L2 L3 G

Power source

Ground

Ground wire

Ground plate

G.L

Ground terminal

Fig. 14

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Table 2 (Example)

(Source : Electrical Equipment Technical Standards, Ministry of International Trade and Industry).

4.3 Protective Device Cable Connection (Fig. 15 and Table 3)

This pump have a leakage detector at the motor bottom and a thermal protector, in the stator coil to protect the motor, with cable connections as illustrated in Fig. 15. Connect terminals P1 and P2 for the thermal detector to P1 and P2 of the same control connector. Connect the remaining terminal G to ground. Table 3 shows detailed speciﬁ cations regarding protective devices.

Table 3

WARNING: AN EARTH LEAKAGE BREAKER MUST BE USED ACCORDING TO LAW TO PREVENT ELECTRICAL ACCIDENTS.

Motor

classiﬁ cation

Grounding

resistance

Grounding line

diameter

AC 600V below

10Ωφ1.6 mm

Thermal protector Leakage detector

Type 9700K 06-215

OLV – 5 (ﬂ oat type)

Manufacturer

SENSATA TECHNOLOGIES JAPAN

LTD.

NOHKEN INC.

Contact rating AC 115V/230V×18A/12A (max) AC 300V×0.5A (max)

Contact type B-contact (normally closed) B-contact (normally closed)

Cable terminal identiﬁ cation

P1 P2

P3 P4

Material and size of cable SOOW-A×#14

INSTRUCTION MANUAL

Model

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CAUTION: A MOTOR PROTECTIVE DEVICE SHOULD BE INSTALLED ON CONTROL PANEL TO PROTECT THE SUBMERSIBLE MOTOR AGAINST OPEN-PHASE, OVER-CURRENT OR INCHING.

4.4 Water Level Switch Cable Connection (Fig. 16 and 17)

Figs. 16 and 17 illustrate typical ﬂ oat switch applications for water level control. Three (or four) ﬂ oat switches are required for single unit operation, whereas four (or ﬁ ve) are necessary for two-unit alternating operation. If you desire our Ebara Water Level Control Float Switch, ask us for a catalog.

For thermal protector

P2 P1

SOOW-A x #14x5 CORE

Alarm (abnormal high level)

OFF

Alarm (abnormal low level)

For ground

For leakage detector

Fig. 15

Fig. 16 Single Unit Operation

Alarm (abnormal high level) ON (2nd Unit) ON (1st Unit)

OFF

Alarm (abnormal low level)

Fig. 17 Two-Unit Alternating Operation