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Summary of Contents for Walchem WDT400 Series
- Page 1 W A L C H E M IW AKI America Inc. WDT400 Controllers WDT400 Series Dual Cooling Tower Conductivity Controller Instruction Manual Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA TEL: 508-429-1110 FAX: 508-429-7433 WEB: www.walchem.com...
- Page 2 WALCHEM and for the purposes disclosed in writing a the time of purchase, if any. WALCHEM’s liability under this warranty shall be limited to replacement or repair, F.O.B.
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Page 3: Table Of Contents
Table of Contents INTRODUCTION........................1 SPECIFICATIONS ........................2 Measurement Performance ....................2 Electrical: Input/Output ......................2 Mechanical .......................... 2 WDT Variables and their Limits ................... 3 UNPACKING & INSTALLATION ..................... 4 Unpacking the unit....................... 4 Mounting the electronic enclosure..................4 Installation ........................... -
Page 4: Introduction
INTRODUCTION The Walchem WDT400 Series controllers offer conductivity control of cooling tower water and control of corrosion/scale inhibitor feed. The inhibitor pump may be selected to operate in one of the following modes: Feed and Bleed Feed and Bleed with Lockout... -
Page 5: Specifications
SPECIFICATIONS Measurement Performance Conductivity Range 0 - 10,000 µS/cm (microSiemens/centimeter) Conductivity Resolution 1 µS/cm Conductivity Accuracy 10 - 10,000 µS/cm ± 1% of reading 0 - 10 µS/cm ± 20% of reading Temperature Range 32 – 158°F (0 – 70°C) Temperature Resolution 0.1°C Temperature Accuracy... -
Page 6: Wdt Variables And Their Limits
2.4 WDT Variables and their Limits Low Limit High Limit Conductivity menu PPM Conversion Factor 0.200 ppm/µS/cm 1.000 ppm/µS/cm Interval Time (sampling) 5 minutes 24:00 hours Duration Time (sampling) 1 minute 59 min: 59 sec % Calibration Range -50 Temperature Menu No variables Bleed Menu Set Point... -
Page 7: Unpacking & Installation
Inspect the contents of the carton. Please notify the carrier immediately if there are any signs of damage to the controller or its parts. Contact your distributor if any of the parts are missing. The carton should contain: a WDT400 series controller and instruction manual. Any options or accessories will be incorporated as ordered. - Page 8 COOLING TOWER BLEED METERING VALVE PUMP HEAT EXCHANGER System A Cooling Tower Controller PRE V N EXT ENTER EX T www.wal chem.com COOLING TOWER BLEED METERING VALVE PUMP HEAT EXCHANGER System B Figure 1 Typical Installation...
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Page 9: Icon Definitions
4. Proper grounding of this product is required. Any attempt to bypass the grounding will compromise the safety of persons and property. Operating this product in a manner not specified by Walchem may impair the protection provided by the equipment. - Page 10 CONDUCTIVITY CONDUCTIVITY FEED B SPARES ELECTRODE A ELECTRODE B BLEED B 4-20 mA (2) (optional) FLOW SWITCH A (OPTIONAL) 4-20 mA (1) (optional) FLOW METER B POWER FLOW METER A ALARM (OPTIONAL) FLOW SWITCH B (OPTIONAL) (OPTIONAL) BLEED A FEED A Figure 2 Conduit/Wiring Configuration...
- Page 11 BLEED FEED L2 L2 N.C. N.O. N.C. N.O. L1 L2/N GROUND STUD SYSTEM B L1 L2/N COND T RED BLK WHT 120V BLU 240V SYSTEM A SHIELD SYSTEM A SYSTEM B COND T RED BLK FLOW SW 1 FLOW SW 2 FLOW MTR 2 FLOW MTR 1 IN ...
- Page 12 System A System B Chart Chart Recorder Recorder BLEED FEED BOI 1 BIO 2 ALARM N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. N.C. N.O. L2/N GROUND STUD GRN 120V GRN 120V GRN/YEL 240V GRN/YEL 240V BLEED B BLEED A FEED A FEED B...
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Page 13: Function Overview
FUNCTION OVERVIEW Front Panel Backlit LCD Display Output LEDs Setting Adjustment Keys Menu/Function Keys USB LED USB Connector On/Off Power Switch Figure 5 Front Panel Display A summary screen is displayed while the WDT controller is on. This display shows the conductivity of tower A on the upper left side, tower B on the upper right side and current operating conditions. -
Page 14: Keypad
Keypad The keypad consists of 4 directional arrow keys and 4 function keys. The arrows are used to move the adjustment cursor and change settings, while the function keys are used to enter values, and navigate the various menu screens. The function keys are ENTER, EXIT, NEXT, and PREV (previous). NEXT and PREV scroll through the various menu choices. -
Page 15: Operation
OPERATION These units control continuously while power is applied. Programming is accomplished via the local keypad and display. To view the top level menu, press any key. The menu structure is grouped by inputs and outputs. Each input has its own menu for calibration and unit selection as needed. Each output has its own setup menu including set points, timer values and operating modes as needed. - Page 16 Figure 7 Main Menu...
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Page 17: Conductivity (A Or B) Menu
Conductivity (A or B) Menu The conductivity menu provides the following settings: Calibration, Self Test, Unit selection, and sampling mode setup. Additional settings are also discussed below. Refer to figure 8, Conductivity Menu Chart. Calibrate To Calibrate the conductivity, use either a hand held meter, or a buffer solution, and adjust the WDT controller to match. - Page 18 Conductivity A or B Menu Possible status screens Cond Wait 23:50 A: 2000 S 68° F Cond Samp 10:00 Conductivity Cond Xtend 10:00 Cond Hold EXIT ENTER PREV. NEXT S Cond 2000 S Cond 2000 Cond 2000 S Cond...
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Page 19: Temperature (A Or B) Menu
Temperature (A or B) Menu The Temperature menu contains the following settings: Calibration and Unit selection . The Temperature menu will be indicated on the display by one of the following: Temperature Normal operation Temp 70°F Normal operation Temp Error Indicates that there is a problem with the temperature input. -
Page 20: Bleed (A Or B) Menu
Bleed (A or B) Menu The Bleed Menu provides the following settings: Set Point, Dead Band, Control Direction, HOA. The Bleed menu will be indicated on the display by one of the following: (The 'A' indicates that the output is being controlled automatically.) Bleed A Indicates that the bleed output is currently OFF. -
Page 21: Feed (A Or B) Menu
Feed (A or B) Menu The Feed Menu adapts to the selected Feed output mode. Hint: For easiest programming, program Feed Mode first, then step through the rest of the feed parameters. The modes are defined as follows: Bleed and Feed with Optional Lockout Bleed and Feed Mode turns the Feed output On and Off at the same time as the Bleed output. - Page 22 Time Limit This setting puts a limit on the amount of time that can be accumulated by the water meter input. Once this setting has been reached, all contacts will be ignored until the accumulated feed time expires. By setting Time Limit = Time/Cont., the accumulation of contacts can be disabled.
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Page 23: Wm1 And Wm2 Menu
WM1 and WM2 Menu The Water Meter 1 and 2 menus are used to set up the type of meter and how to convert the water meter signal into volume. The Water Meter menus will be indicated on the display as follows: WM1 100 Gal or Liters Reset Total This allows you to restart the totalizer display. -
Page 24: Alarm (A Or B) Menu
Alarm (A or B) Menu The Alarm menu screen will appear as follows: Alarm OFF Alarm LOW ALRM Alarm HI ALRM Set % Low This is the % below the bleed set point that the LOW ALARM will activate. If the set point is 1000 and the % Low setting is 20 then the Low alarm will activate at 800. -
Page 25: Time Menu
Time Menu This menu has only one choice, to set the Time used for Datalogs. This menu will appear as follows: Time: Mon 10:20 Set Time Press ENTER to set the Time. Use the arrow keys to adjust the day and time and then press ENTER to store or EXIT to discard. -
Page 26: 4-20Ma (A Or B) Menu
4-20mA (A or B) Menu This menu is only available if the 4-20mA output is installed in the controller. Installing this option board in the left hand position in the controller will assign it to Tower A. Installing a 4-20mA option board in the right hand position assigns the output to Tower B. -
Page 27: Access Code Menu
5.10 Access Code Menu This menu determines whether the access code feature of the controller is enabled or disabled and allows you to customize the access code to your own value. The access code controls whether or not you are allowed to change the parameters in the controller. With the access code disabled, any user may change any parameter. -
Page 28: Datalog Menu
5.11 Datalog Menu This menu is available if the data logging option has been purchased. This is indicated in the model code by the letter U at the end of the model code. This menu allows you to save data from the controller to a USB flash drive. -
Page 29: Config Menu
5.12 Config Menu This menu allows you to export a file that contains all of the set points in the controller to a USB flash disk drive, and then later import the set points into another controller. Export Config Place a USB flash drive with at least 10 MB capacity into the USB port on the front panel of the controller. -
Page 30: Upgrade Menu
5.13 Upgrade Menu This menu is used to upgrade the software to a newer version. If a new version of the software is available, an upgrade file will be posted on our web site. Save this file to a USB flash disk drive. It needs to be the only executable (.exe file extension) file stored on the root directory of the stick. -
Page 31: Maintenance
MAINTENANCE The WDT controller itself requires very little maintenance. Wipe with a damp cloth. Do not spray down the controller unless the enclosure door is closed and latched. Electrode Cleaning NOTE: The controller must be recalibrated after cleaning the electrodes. Frequency The electrodes should be cleaned periodically. -
Page 32: Replacing The Fuses
Warning: Use of non-approved fuses can affect product safety approvals. Fuse ratings depend on controller power rating. Specifications are shown below. To insure product safety certifications are maintained, it is recommended that a Walchem fuse is used. F1 Fuse Walchem P/N... - Page 33 TEMP ERROR It indicates that the temperature signal from the conductivity electrode is no longer valid. The controller reverts to manual temperature compensation. Possible Cause Corrective Action Green or White electrode wire disconnected. Reconnect. Faulty electrode Replace electrode. COND ERROR This error condition will stop conductivity control.
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Page 34: Conductivity Readout Does Not Change
COND LOW ALARM This error message indicates that the conductivity is below the programmed percentage below set point. The conductivity will continue to be monitored, and the feed output will be allowed to be activated. Possible Cause Corrective Action Fouled conductivity electrode See Conductivity Electrode Troubleshooting section Electrode disconnected Reconnect... -
Page 35: Procedure For Checking Relay Outputs
Procedure for checking relay outputs If any prewired output is not activating the device (pump, valve, etc.) attached to it: Verify that the pump or valve is not faulty by plugging it directly into a wall socket. In some controllers, certain relays are NOT internally powered. Check the instruction manual to determine if the relay is a dry contact type. - Page 36 Model Code WDT400 Voltage Output Sensor U (USB) VOLTAGE 1 = 120 VAC, prewired 5 = 100-240 VAC, conduit OUTPUT N = No data output 4 = Single 4-20 mA output 2 = Dual 4-20 mA output (WDT) SENSOR N = No electrode WDT400 1 = Two graphite electrodes &...
- Page 37 FIVE BOYNTON ROAD HOPPING BROOK PARK HOLLISTON, MA 01746 USA TEL: 508-429-1110 FAX: 508-429-7433 Web: www.walchem.com...
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