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Teral NX-VFC Instruction Manual

Estimated terminal pressure constant control of water supply unit - multiple pump control
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Instruction Manual
Estimated Terminal Pressure
Estimated Terminal Pressure Constant
Constant Control of Water
Control of Water Supply Unit
Supply Unit
NX-VFC/NX-VFC-e Multiple pump control
Important Notice
Thank you very much for purchasing the TERAL water supply unit.
In order to use the water supply unit appropriately, read this instruction manual
before using, and do not perform operation, maintenance and inspection before
understanding the description in this manual thoroughly.
For safety purpose, observe the cautions and warnings in this instruction manual
and those on the labels affixed on the water supply unit.
Keep this manual carefully at hand where it can be consulted at any time of
operation, maintenance and inspection of the water supply unit.
To whom performing utility work:
Be sure to submit this manual to the customer performing
operation, maintenance and inspection of the water supply unit.
TERAL INC.

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  • Page 1 NX-VFC/NX-VFC-e Multiple pump control Important Notice Thank you very much for purchasing the TERAL water supply unit. In order to use the water supply unit appropriately, read this instruction manual before using, and do not perform operation, maintenance and inspection before understanding the description in this manual thoroughly.
  • Page 2 (6) Failures and breakage caused by any use outside the specification limit of the equipment Teral Inc. shall not be liable for any damage caused by incorrect or reckless use of the water supply unit even if such damage occurs within the warranty period. Cost and expenses incurred for sending engineer(s) in such a case shall be borne by the user.

  • Page 3: Table Of Contents

    Contents Safety precautions ············································································································ 1-1 Explanation of safety indications and graphic symbols ························································ 1-1 Safety precautions ······································································································ 1-1 Before using the water supply unit ························································································ 2-1 Points to be checked ··································································································· 2-1 Model type description ································································································· 2-1 Configuration and overview of the water supply unit ································································· 3-1 Specifications of the water supply unit ·············································································...

  • Page 4: Safety Precautions

    1. Safety precautions Before using the unit, thoroughly read this “Safety precautions” to properly use the product. Information described below is vital to safe and proper use of the unit and prevention of hazard and/or damage. Explanation of safety indications and graphic symbols This instruction manual divides safety indications into four categories according to the level of hazard (the extent of damage/losses and the urgency).
  • Page 5 Teral inc. Otherwise, it may lead to injury, failures and/or various If unskilled personnel carry out the work that requires special accidents.
  • Page 6 Otherwise, it may lead to injury and/or damage. In the event of an alarm or abnormal condition that Ensure to carry out inspection according to the cannot be resolved, immediately contact Teral Inc. maintenance checklist. or its service provider. Otherwise, you cannot prevent potential failures, thus leading to a higher risk of accidents.

  • Page 7: Before Using The Water Supply Unit

    2. Before using the water supply unit Make sure that the delivered package is placed right-side up before Caution unpacking. Pay special attention to nails especially when opening a wooden crate or you may get injured. After unpacking, ask the vendor to dispose of packaging materials that Note are no longer necessary.

  • Page 8: Configuration And Overview Of The Water Supply Unit

    Caution the specifications. Otherwise, electric shock, fire, water leakage, or property damage may occur. If the inflow pump head is 5m or more, contact Teral for consultation. Note Table 3-1 Standard specifications of water supply unit : 2-pump Parallel, 3-pump Rotation...

  • Page 9: Names And Functions Of Each Part

    A ir vent plug of pump This plug is used to release air from the pump. Pump drain This drain is used to discharge water from the pump. Fig.3-2-1 NX-VFC-e Multiple pump control water supply unit (This figure shows for 3 pumps unit)
  • Page 10 3.2.2 Names and functions of control panel elements Display It displays a variety of information about the water supply unit. ( 7.4) Operation selector switch #1 operation #2 operation #3 operation #4 operation #5 operation Power #1 Block #2 Block #3 Block #4 Block #5 Block...
  • Page 11 3.2.3 Configuration of the control panel While the power is on, high voltage is applied inside the control panel, which is very dangerous. Any person other than the one authorized to Warning do so must not open cover of the control panel. if not followed, it may cause an electric shock.
  • Page 12 3.2.4 Control board The following are the details of the control board. Do not remove the protective cover on the control board or the cover of Warning the I/O terminal block when the power is turned on. Otherwise, it may lead to an electric shock. CN26 Operating CN29...

  • Page 13: Specifications Of Control Panel

    Specifications of control panel Table 3-3 Specifications of control panel Item Specifications 1 Specifications 2 Control panel model BQNXC Automatic rotational operation Operation mode (WX3/TX3/TX4/FX4/FX5/GX5) Material and external color of casing Steel plate (Munsell 5Y7/1 semigloss/baking finish) Output range Three-phase 200/200-220 V (50/60 Hz) 1.1 to 7.5 kW Ground fault interrupter Individual pump systems...

  • Page 14: Specification Tables

    Specification tables 3.4.1 Standard models (positive suction type) Table 3-4-1 Specification list (positive suction type) Nominal dia. mm Standard specification Spec. range Charged Phase/ pressure in Output Max. water Total pump Min. pump Stop pressure Water supply Discharge Suction Operation Voltage Type pressure tank...
  • Page 15 3.4.2 Special models (negative suction type) Table 3-4-2 Specification list (negative suction type) Nominal dia. mm Standard specification Spec. range Charged Phase/ Output pressure in Max. water Total pump Min. pump Stop pressure Water supply Discharge Suction Operation Voltage Type pressure tank head condition...

  • Page 16: Installation

    4. Installation Precautions for installation When moving or installing the unit, never lift it in an unstable condition or with any load applied to the pressure tank, pipes, or control panel. Otherwise, the unit may fall, resulting in injury and/or damage. Warning Before lifting the unit, refer to the catalog, the external dimensions drawing, or other documents to check the weight of the unit, and use an...

  • Page 17: Precautions For Piping Work

    Precautions for piping work Do not screw a pipe into the pump with the companion flange attached Caution to the pump. Otherwise, it may damage the pump. Do not merge the suction pipes. Do not install the piping with a shape of upward bend (i.e.

  • Page 18: Precautions For Wiring Work

    Precautions for wiring work Use the wiring equipment and devices compliant to use conditions, and carry out wiring work safely and securely according to the technical standards for electrical facilities, as well as the indoor wiring Warning regulations. Only qualified personnel such as licensed electrical engineers are allowed to carry out electric wiring work.
  • Page 19 4.3.2 Instrumentation Carry out wiring work for instrumentation according to the following procedure. Insert the instrumentation wires into the inlet ports for instrumentation wires, secure the wires by passing the binding band through the clamps on the right side face inside the control panel and under the contorl Note board, and then connect them to the board.
  • Page 20 Table 4-3-2 (a) Wiring patterns (ball tap type) Single receiver tank Double receiver tank Control panel Control panel Level regulating Level regulating Level regulating valve valve valve Ball tap Ball tap Ball tap Receiver tank Receiver tank #1 Receiver tank #2 Water supply unit Water supply unit Tank Selection setting:...
  • Page 21 Table 4-3-2 (b) Wiring patterns (inflow solenoid valve type) Single receiver tank Double receiver tank Control panel Control panel Level regulating Level regulating Level regulating valve valve valve Receiver tank #2 Receiver tank #1 Receiver tank Water supply unit Water supply unit Tank Selection setting: No.1 Tank Selection setting:...
  • Page 22 (2) External output signals Connect wires to the external output terminals as shown in the following diagram. External output terminals (Control board I/O terminal block) Fig.4-3-2 External output terminals (Parameter: P100, setting: 0) The parameter P100 allows you to select an external relay output pattern from Note 5 options.

  • Page 23: Preparation For Operation

    5. Preparation for operation Points to be checked before test operation 5.1.1 Electrical system Before carrying out work such as wiring change, be sure to shut down Warning the power of the panel board and confirm that the pilot lamp is turned off.

  • Page 24: Turning On The Power

    (6) Loosen the air vent valve to discharge the air from the pump. At the same time, manually turn the pump to discharge the air from the impeller completely. When the water starts running over and the air feeding stops, priming of water is completed. Never operate the pump without priming water.

  • Page 25: Test Operation

    6. Test operation Check items related to manual operation Check the following items related to manual operation for all the pumps. Note Operation (1) Select “Manual” with the switch. select (2) Press “MANUAL” switch of the pump to be operated (pump No. should be indicated instead of “n”.), Manual and then press the cursor switch .

  • Page 26: Check Items Related To Automatic Operation

    Check items related to automatic operation Operation Select “Automatic” with the switch to perform automatic operation. Selector First, carefully read the following sections to understand how automatic operation works, and then confirm that the unit runs properly in automatic modes using the test pipe. During the operation, also check each pump for any abnormal pressure, noise, or vibration.

  • Page 27: Basic Operations And Indications/Settings

    7. Basic operations and indications/settings This section describes detailed information about operation, display and setting for the unit. Pump Operation 7.1.1 Selecting operation mode Operation Select an operation mode with the switch on the operation panel. Selector Table 7-1 Operation mode selection “Manual mode”...

  • Page 28: Selecting A Receiver Tank

    Selecting a receiver tank Tank Select a receiver tank to be used with the switch on the operation panel. selector For selecting a water tank and the circuits to be used, refer to Table 7-2(b). Table 7-2 (a) Water Tank Selection “No tank”...

  • Page 29: Selecting The Operation Of The Inflow Solenoid Valve

    Selecting the operation of the inflow solenoid valve Solenoid You can select the operation of the inflow solenoid valve with the valve switch on the operation panel. operation selector Note that setting the Tank Selection to “No tank” disables these settings. Table 7-3 Solenoid Valve Operation setting Man.

  • Page 30: Indications On The Display

    Indications on the display The items described in Table 7-4 can be displayed, through display switching procedures. For the procedures, refer to each section shown in the “Reference page” column. Table 7-4 Display item list Reference Display item Description Priority Category page It shows that the system is currently suspended...
  • Page 31 7.4.1 How to switch basic information display Normally, the display shows the pressure in the discharge piping. Display In special cases such as the activation of an interlock, the occurrence of an alarm, or during the freeze-proofing cycle, however, the display shows the corresponding message based on the sequence specified in Table 7-4.
  • Page 32 7.4.2 How to display alarm logs Press the switch at Manual Confirm Alarm log display mode the alarm log display If no alarm log exists transition point "no” and “Err” are alternatively displayed to enter the alarm log Manual display mode. Confirm When alarm logs exist In the alarm log display...

  • Page 33: Parameter Settings

    If the operation mode is set to “Manual”: #n Pump information Other pump When basic information is information Preset frequency displayed displayed, press the e.g. 10 Hz The long-press switch will continuously increase or switch and the decrease the preset frequency. Normal Preset frequency is changed indication...
  • Page 34 7.5.2 Parameter setting procedure Parameters are set in “Setting mode.” Entering the setting mode When the normal indication is displayed, hold down the Setting switch for at least 3 seconds to enter the “setting mode.” When the system enters the setting mode, the basic parameter selection screen appears, and the indicator lamp alternately shows and the set value.
  • Page 35 Canceling the change of the set value To cancel the change of the set value and return to the parameter selection screen, press the Manual Back switch. Exiting the setting mode Press the switch to exit the setting mode and return to the normal mode. Setting Also when no operation is carried out for 60 seconds in the setting mode, the system automatically exits the setting mode and returns to the normal mode.
  • Page 36 7.5.3 Basic parameters The following are basic parameters for using the water supply unit. (1) Total pump head : Total Pump Head Seletcts the total head for automatic operation. Function Referring to “3.4 Specification tables,” set the total head that complies with the specifications.
  • Page 37 (4) Inspection mode setting : Inspection mode setting Enters/Exits the inspection mode. Function * The inspection mode setting is not retained when the power is shut off. : In inspection mode Setting range : In normal mode Initial setting : In normal mode Remarks For the inspection mode, refer to “8.2 Inspection mode.”...
  • Page 38 Table 7-5-4 External relay output pattern P100 set value Terminal No. 1 run No. 1 run No. 1 run No. 1 run Run * No. 2 run No. 2 run No. 2 run No. 2 run On inspection * No. 3 run No.
  • Page 39 (2) Pole number setting of water level electrodes : Pole number setting of water level electrodes Function Seletcts the number of electrode bars for measuring the water level Adjustable 4: 4 electrode bars (4P) range 5: 5 electrode bars (5P) 4: 4 electrode bars (4P) Initial setting (If you specify the other value upon placing an order, the specified value...
  • Page 40 (5) Solenoid valve control method setting : Solenoid valve control method When the Tank Selection is set to “Common” and the Solenoid Valve Operation is set to “Auto,” selects whether the solenoid valve for Tank Function No.1 and the solenoid valve for Tank No.2 are controlled simultaneously or alternately.
  • Page 41 (8) High temperature alarm detection setting : High temperature alarm detection Function Seletcts whether or not to detect a high temperature alarm. Adjustable 0: No detection range 1: Detection 1: Detection (If you specify the other value upon placing an order, the Initial setting specified value is preset in the parameter.) Use the water supply unit by selecting “Detection”...

  • Page 42: Maintenance And Inspection

    If any problem is found during inspection, immediately stop operation, Warning and remove the cause or contact Teral. or its relevant service company. Otherwise, it may lead to an accident. When carrying out a daily inspection, carefully observe the following points: A large deviation in the pump’s discharge pressure, current, vibration, noise, or other conditions from...

  • Page 43: Inspection Mode

    Inspection mode You can put the system into the inspection mode to nortify other personnel that inspection is in progress. (1) Entering and exiting the inspection mode ( see 7.5.) To enter the inspection mode Set the basic parameter to “on.” To exit the inspection mode Set the basic parameter to “off.”...

  • Page 44: Maintenance Check List

    Caution inspection that requires disassembly of the unit, be sure to contact a specialized vendor or the service center specified by Teral. Incorrect work may cause a failure or accident. Do not perform an insulation resistance test on the control panel. Before...
  • Page 45 Table 8-3(b) Maintenance check list Replacement cycle of consumables Frequency (as a guide) Inspection point Inspection item Method Criterion Replacement Consumable Qty. cycle Visual Head As per the specifications check Electric current value Measure As per the specifications Operating conditions Listen Noise, vibration No abnormal condition...

  • Page 46: How To Handle Troubles

    9. How to handle troubles In the event of an alarm or abnormal condition that cannot be resolved, immediately stop the operation and contact Teral. or its service company. Otherwise, it may lead to an accident. Caution Before the contact, check the status of abnormal condition and the alarm code No., as well as information shown on the nameplate, and...

  • Page 47: Troubleshooting

    Troubleshooting Table 9-2(a) Troubleshooting Alarm Description Probable cause Remedy code Water flows into the tank continuously because the Solenoid Valve Operation setting is set to Set the Solenoid Valve Operation to “Auto.” “Man. Open.” Water does not stop running because of a failure Check and/or replace the ball tap.
  • Page 48 Table 9-2(b) Troubleshooting Alarm Description Probable cause Remedy code An overload has occurred because the unit is Adjust the load so that it falls within the running at a flow rate outside the specified range. specified range. E101 No.1 overload An overload has occurred because of damage to It is necessary to replace the bearings.
  • Page 49 Table 9-2(c) Troubleshooting Alarm Description Probable cause Remedy code E105 No.1 flow switch failure The flow switch is broken or its wiring is E205 No.2 flow switch failure disconnected. It is necessary to check and/or replace the flow E305 No.3 flow switch failure switch.
  • Page 50 Table 9-2(c) Troubleshooting Alarm Description Probable cause Remedy code No.1 open-phase E116 output No.2 open-phase E216 output No.3 open-phase It is necessary to check and/or replace the E316 The motor has burned out. output motor. Contact us or the service company. No.4 open-phase E416 output...

  • Page 51: Special Specification

    10. Special specification 10.1 Negative suction type This section describes specification of the negative suction type Orifice Union water supply unit. By employing the negative suction type unit, suction of up to -4m (actual pump head) and -6m (total pump head) is enabled. A constant relief kit (an orifice, a ball valve, a nipple, and a union) is provided.

  • Page 52: Models With Outdoor Cover

    10.2 Models with outdoor cover This section describes the assembly and disassembly of the outdoor cover. Accessory Remove the outdoor cover before installation. Also, remove the top plate and the front plate of the outdoor cover, before Mounting leg operating the control panel. Top plate support Attach the mounting leg to the unit base.
  • Page 53 Head Office 230, Moriwake, Miyuki-cho, Fukuyama-city, Hiroshima, 720-0003, Japan Tel.+81-84-955-1111 Fax.+81-84-955-5777 www.teral.net 2017 06 E‑IMN‑00289‑000‑T...

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