WCM-continuous installation manual
Contents
1. eene 10 Appendices 5o licia eb eed i boe de aer sai 10 No part of this publication may be reproduced by any means without prior written permission from Grodan B V I Introduction This manual contains an explanation of the installation and operation of the Grodan WCM conti nuous whereby the attention is focused on the various connections and the hardware settings Notes included at several points in the manual refer to the appendices which contain detailed pho tos with additional information For the most up to date user manual of the WCM continuous with this model number go to www grodan com and look under Services 2 Components The WCM continuous is comprised of 4 sepa rate components and several cables a Sensor b Cable between sensor and buffer fitted with plug fixed length of 1 35 metres c Buffer on an aluminium buffer base with a display for measurement readings d Covered cable between buffer and mainbox variable length maximum of 2000 metres 2x twisted pair cable e Mainbox with a display for measurement readings f Wires in covered cable WC EC and T between mainbox and computer or satellite recommended maximum length 3 m g Adapter h RS232 cable for connections if appropriate of WCM to PC via Gronow i CD with software and manual not included with standard order figure Schematic diagram of the WCM continuous Appendix This cable is2. Installation Manual Contents PEE qj 2 6 252 r UUM 3 2 COMPONENTS sch cere ss ES ERRARE EROS oe ERU TS IU UE HN CASES Sid 3 3 Operating principle eeeeeee eee 4 del General INOMMatlOn rosies odio dh eod e dedecus TASTI II ed 4 3 2 Specific information s issirsirsissitiak rinik EA EE En ei 4 di THE SENSOF 625255 66565 55052465 5254056444668068 6605 oto DIE II DIM OT EDO ud mt 4 5 The Buffer mounted on an aluminium buffer base 2 5 Ihe qmanDOX siii e ee ele ee i PA oa RR RO dead OR d aon ens 5 6 Sei e c M 5 GLbLl ThePower Supply asuaud au uu eee bes eee oh narnia HERAUS eR RS QE 5 5 L2 TREE alia et 6 540 3 Theanalogue OUPDHES scesaraee xdud sedare dra ape aree RR ME an Aa a atas 6 6 2 Mainb x settings scioccato 6 G22 Signal Settings ECCE TIT TL 1 e spisae ra ena a aa a 6 6 3 Checking the operation susce diu sce Er reader 6 7 Extra CHECK iod ad SU HERE IHRER Rd d da qd don QA RE ROPA RARE RES 7 8 Maintenance 229x950 ERA RR Vu VERE EUM aperire 7 9 Range and accuracy in stone wool ee sss 8 10 Troubleshooting eeeeeeee hn 8 LEGE certilication occaeca uou due mice doe oio tent IRR a ds ues a as fara 9 12 Guarantee Terms and conditions Lees en 9 13 Manufacturer s information
3. DIP switches for the ana logue outputs e SW 3 6 of S3 Figure 6 The jumpers for the analogue outputs e 2 and 3 Figure 7 Two rotary switches in the buffer e Switch on your right to select slab type e Switch on your left future applications Photo 2 The sensor 4 Photo 3 The buffer on the buffer foot supplied with the unit 6 1 2 Appendix III
4. not supplied with the meter Although lengths in excess of 3 m can be used the customer will bear the responsibility for any resultant malfunctions 3 Operating principle 3 1 General information The sensor performs digital measurements of the WC in volume EC in mS cm and T in C It constitutes the heart of the instru ment The buffer ensures communications The mainbox s mother board provides for the ultimate control and processing of the data The measurements are converted into a proto col that can be read by the various types of irrigation and climate control computers Specific settings such as the analogue signal to the horticulture computer can be made only on the mother board A once only adjustment of the settings of the mother board is required to ensure that the mainbox communicates with the peripheral equipment horticulture computer in the appropriate manner Further adjustments are not required The slab type setting must be adjusted in the buffer 3 2 Specific information I The WCM continuous is equipped with 3 separate digital analogue converters for 3 outputs WC EC and T including a Dip switches for the selection of the type of analogue output 0 5VDC 0 10VDC 0 20mA 4 20mA 0 24mA The resolution is approximately 2 bits b Galvanic separation of the analogue out puts from the earth of the power supply 2 Specifications of the signals subsequent to conversion into the selected an
5. red for a few minutes 2 3 4 5 0 20mA 4 20mA 0 24mA 9 5V 9 l0V 4mA 0 20mA 100 0 mA 0 24mA 100 OV 0 IOV 100 0 mA 0 24mA 20 0 mA 0 24mA 50 Table 2 Analogue settings Table for T output protocol I protocol 4 0 10 V protocol 5 Jumper 9 min ar nai NNNM 1 2 left not relevant 2 3 right fitted These settings are also applicable to the EC when they then pertain to SW3 SW4 J10 and JI I and to the WC when they pertain to SWI SW2 J12 and J13 If LED 3 incidentally turns red then the mea surement is incorrect If LED 3 frequently turns red for longer periods then one of the compo nents is not working properly or there is a wrong connection and or improper setting Check all connections and settings again and then plug the adapter into the power mains Tip 10 LEDs 4 5 and 6 are of significance only with the 4 20 mA setting When the LEDs are not lit up the unit is operating correctly If the current falls below 4 mA then the red LED on the relevant channel will light up for example in case of a cable break 7 Extra check After connecting the meter you can check its operation by reading out the values measured WC EC and T on the displays of the mainbox and buffer These values must agree with each other as well as with the values measured on the horticulture computer A hyperlink is not needed to read out the measurements Tip II Take care when checking o
6. without achieving a good connection Verify the connection by pulling on the lead once the screw has been tightened 4 The sensor Refer to the instructions in the WCM continu ous Cultivation Manual compiled by Grodan for the method used to determine the correct measurement location of the sensor The installer should take account of the grower s need to be able to readily transfer the sensor and the buffer to a new location The buffer is fitted with a buffer base allowing the buffer to be positioned near the measured slab Ensure that the buffer still has a few extra metres of cable 5 10 metres so that it can be moved over a distance of several slabs Tip 3 With the new sensor it is possible to measure EC levels between 0 and 20 mS With the old meter this was possible for levels between 0 10 mS Be alert to this when adjusting settings regarding the horticulture computer Tip 4 Before putting the sensor in place use the hand meter to carry out identical measurements of at least 25 to 40 slabs within an irrigation compart ment placing the sensor cross wise on the slab see figure letter A to find the average WC and EC values Place the WCM continuous sensor in a slab which corresponds with the average value The best position for the sensor is approximately 10 cm from the block and not close to the drain opening During the first few days check whether the measurements correspond with the measure ment
7. alogue pro tocol a WC minimum signal 0 maximum signal 100 76 v v b EC minimum signal 0 maximum signal 20 mS cm c T minimum signal 0 maximum signal 50 C 3 The meter carries out regular measure ments and refreshes the analogue output signal at 3 minute intervals 4 The mainbox equipped with a display on the front for reading off WC EC and T measurements the last three minutes measured a displays the operation via LEDs b is constructed from shielded prints EMC C can as an option generate an alarm or a start command via a separate output 5 All instrument housings comply with IP65 requirements subject to the proviso that only one round cable is fed through each gland 6 The power supply is provided by the adapter not via the computer Attention The adapter provided with the meter works only with 48 VDC Improper voltage connections can cause damage to the WCM Tip I Pay due care during the installation of the compo nents on location The components must be dry and not exposed to direct sunlight Preference should also given to a location that is not in the immediate vicinity of a boiler or CHP plant Tip 2 When connecting the wires to the screw terminals it is important to ensure that the screw is fully loosened prior to inserting the wire This is neces sary since it would otherwise be possible to insert the wire under the catch and then tighten the screw
8. e components or materials in question GRODAN cannot accept liability for any other obligations such as compensation for loss arising from the dissolution of the contract Any claims under this guarantee must be submitted to GRODAN in writing within eight days sub sequent to the date on which the loss is incurred b In the event of the failure of the customer to fulfil any obligation arising from the con tract with GRODAN or failure to do so in due time then GRODAN will be absolved in all instances of all obligations with respect to the guarantee or payment as laid down in the contract 13 Manufacturer s informa tion Produced by Venne Electronics BV The Netherlands All rights reserved No part of this publication may be reproduced or published by means of print photoprint microfilm or any other means without prior written permission from GRODAN The reser vation of these rights is also applicable to the drawings and diagrams incorporated in this publication GRODAN reserves the right to modify parts of this instrument at any time without the issue of prior or direct notification to the client The contents of this publication are also subject to amendment without notification Please contact Grodan Customer Service for additional information about settings mainte nance and repairs Although every care was taken during the preparation of this publication GRODAN can not accept any liability whatsoe
9. ect your slab type In this way you can use the new meter for various types of substra tes For this purpose a selector switch with 10 positions is integrated into the buffer This is the rightmost switch of the two switches positio ned to the right of the display The left switch with 15 positions is meant for future applica tions see app Il figure 7 The default manufac turer s setting is type Il When changing the slab type by means of this switch the system must be disconnected from the power supply by removing the adapter from the electric socket After changing the settings the adapter can be plugged in again whereupon the system will reset itself To find out which setting to choose for which slab type please consult the enclo sed list 5 3 Display The buffer is equipped with a display for rea ding out the last measured values WC EC and T at intervals of 3 minutes see app III photo III The measurements are displayed in the following order Buffer number Slab type WC EC and T While these measurements are read out a vertical line will be lit up on the left display for Buffer number and Slab type A hori zontal line will be lit up for WC EC and T Refer also to the text next to the left display on the blue foil of the buffer cover Attention For this continuous meter the buffer number will always indicate Tip 7 The cover on the mainbox as well as on the buffer is fitted with a display showin
10. f the sensor certain frequencies may cause deviations in the measurements taken The size of the deviation and the frequencies involved are described in the laboratory documents 03C01265EUT If requested Grodan can send you these documents ny liability for the contents May 2004 ept a ce is compiled with the greatest possible care and in accordance with the latest technical developments we cannot acc information and advi Although all our More information Grodan A S Denmark Tel 45 4656 0400 Fax 45 4656 1211 E mail info grodan com Grodan BV The Netherlands Tel 31 475 353 020 Fax 31 475 353 716 E mail info grodan nl www grodan com 12 Guarantee Terms and conditions a GRODAN guarantees that the best quality materials are used for the manufacture of the products supplied to the customer Should it nevertheless transpire that the products supplied to the customer exhibit defects as a result of problems with the materials or errors made during manufac ture then GRODAN will decide whether to repair these defects arrange for them to be repaired supply the spare parts needed for the repairs replace the goods or issue a refund to a maximum amount of the value of the goods This guarantee is issued for a period of 12 months subsequent to delivery In issuing this guarantee GRODAN relies on the liability of the supplier for the goods or materials with respect to the warranty and to complaints about th
11. g the latest measure ments WC EC and T at intervals of 3 minutes This makes it possible to check whether the values measured comply with the measurements dis played on the horticulture computer This feature also makes it easier to find a representative mea surement slab as the value measured can be read on the spot 6 The Mainbox The mainbox s mother board serves as the measurement and processing unit of the WCM continuous A minimum number of con nections must be made to the mother board prior to the use of the meter 6 1 Connections The following sub sections explain the various connections in more detail Figure 2 View of the mother board in the mainbox Appendix Il 6 1 1 The Power Supply The power supply from the adapter must be connected to the black wire connection 21 and the 7 white wire connection 20 terminals of connector 8 Make sure that it is possible to disconnect the wires when neces sary The voltage is 48 VDC and power con sumption is 10 W The polarity is important so make sure that you connect the and poles to the proper access terminals For details refer to figure 3 6 1 2 The Buffer Four wires are used to connect the buffer to CON2 on the mainbox see figure 4 This requires a shielded twisted pair cable Make sure that one pair of wires RS485 is used for the communications A and B and that the other pair is used for the power supply GND and POWER figure 4 C
12. onnection of the buffer to connector 2 CON2 Appendix II 6 1 3 The analogue outputs The connections for the analogue outputs of the WC EC and T are located in connector 8 see figure 3 Make sure that the polarity is correct for this purpose the terminals are marked with T T etc The T EC and WC are linked to each other and therefore have the same earth This is not the same earth as that of the power supply The three outputs are galvanically separate from the power supply and all other connections Figure 3 Connections 22 27 Appendix 11 6 1 4 Direct connection and text on PC through RS232 cable The RS232 cable figure 2 15 can be used to make a direct connection to the PC This allows you to read out measurements directly in Grodan s Gronow programme 6 2 Mainbox settings 6 2 1 Signal settings The mainbox supplies three sets of output sig nals WC EC and T Each of these signals can be converted according to five different protocols The requisite protocol to be selected depends on the type of computer Table I Analogue protocols Protocol Paramete 0 mA 0 20mA 100 0 mA 0 20mA 20 0 20mS cm 0 mA 0 20mA 50 4mA 0 20mA 20 4mA 0 20mA 50 Table lists the various forms of the output signals The settings of each canal are adjusted using the dip switches of S3 see figure 5 and the jumpers J8 up to and including J13 see fig ure 6 See table 2 Tip 8 It is important
13. pipe together with other cables for example for frequency regu lated pumps or ventilators it may be affected by the other cables Antenna cables may also interfere with transporting the measurement signals Make sure that the cables shielding is properly grounded via the horticulture computer and not via the WCM continuous Tip for user If you are not sure whether the sensor is producing correct measurements you can remove the sensor from the slab and wipe the pins dry The meter should then display the ambient temperature within a few minutes and WC and EC should O If you immerse the sensor pins completely under water the WC value should be practically 0075 The ambient and measured values for EC can be checked with a conventional EC meter or by using water with a known EC value Attention You should check which calibration method was used to cali brate the conventional EC meter see comment under Table 2 If any of these values is very diver gent you should contact Grodan Customer Service ll CE certification The WCM continuous has been granted CE certification i e the instrument has been tested and found to comply with the following EMC guidelines EN61000 6 4 2001 EN61000 6 2 2001 EN61000 3 2 1995 Al 1998 A2 1998 EN61000 3 3 1995 Note The performance of the WCM can be influenced by transmitters emitting radio frequencies in the vicinity of the meter Due to the operating principle o
14. r setting the minimum and maximum measurement values With some climate control computers a few minutes may be required before the correct value is displayed on the screen Tip 12 No description has as yet been provided for a num ber of connections These are intended for future expansions such as digital communications with the horticulture computer and diagnosis using a PC 8 Maintenance The mainbox and buffer of the WCM continu ous do not require any maintenance The set tings of the D A converter may need to be adjusted if a new horticulture computer is used with the meter The sensor does not need to be calibrated If you have any doubts you can cali brate the meter by holding it in the air and inserting the pins into water The measurements read off should then be 076 and 10076 respec tively with a margin of 576 In case of faulty measurements please contact your supplier However it is a good idea to regularly remove any deposits for example nutrients from the sensor pins When changing from one culture to another the sharp sensor pins should always be well protected to prevent any damage or injury 9 Range and accuracy in stone wool As indicated earlier the WCM measures the water content EC and temperature the aver age over the depth of the slab Table 3 specifies the conditions under which the WCM carries out measurements and the accuracy of these measurements The accuracy exhibits a gradual shif
15. s made using the hand meter Tip 5 The cable between the sensor and the buffer has a fixed length of 1 35 m Account needs to be taken of this length during the installation The cable between the buffer and the mainbox may be of every required length to a maximum of 2000 metres It is recommended that at least an extra O metre length of cable is used so that the sen sor can be relocated to a different stone wool slab during the cultivation period This cable should preferably not be placed in a cable channel due to the possible interference with the WCM measure ment signal Tip 6 Consideration can be given to fitting a plug to the cable between the mainbox and buffer It will then be possible to remove the buffer and sensor from the greenhouse during the change of crops The plug needs to be watertight 5 The Buffer mounted on aluminium buffer foot 5 1 Connections The cable from CON from the mainbox to the buffer must be connected to the terminals of the buffer The correct sequence is indicated next to the connector it is important to ensure that the wires are connected to the equivalent screw terminals i e A to A and B to B Next connect the sensor to the buffer s CON using the plug Attention Improper connections will cause damage 5 2 Setting the slab type Each Grodan slab type has its own unique moi sture distribution In order to obtain the best results from your WCM continuous meter you must sel
16. splay of One of the three measured variables is not mainbox transmitted Check to make sure that the cables are In cases of extremely divergent readings the correctly connected and that there is no sensor is usually defective Please contact cable break Grodan Customer Service so that a new sensor can be sent in consultation No measurement value on display of buffer Check to make sure that the sensor is Measurement values on displays of buffer and properly connected to the buffer mainbox do not agree Check the cables between sensor and Check the cables between mainbox and buffer buffer for breakage or damage Measurement values on display of mainbox do not agree with readings on horticulture com puter Check to make sure all dip switches or jumpers have been properly set during the last installation When setting the 076 and 10076 values on the horticulture computer wait a few min utes extra for the values to stabilize Check whether the cables have been pro perly connected In all cases in which the malfunction cannot be corrected after the checks mentioned above you should contact Grodan Customer Service After consultation a decision can be taken to carry out repairs using advice from a distance or to call in the help of a service technician Tip for installer For new installations the measurement signal may be influenced from the outside by a ground loop If the cable is laid in a common cable
17. t between the various ranges and outside the ranges Table 3 Specifications The resolution indicates the smallest interval which can be measured using the meter Attention The EC measured using the WCM is calibrated via the international standard at 20 C Globally most EC meters are also calibrated at 20 C However in the Netherlands it is more usual to cali brate EC meters at 25 C which results in a measurement 10 higher than when taken with a meter calibrated at 20 C Therefore if one compares the EC measured by the WCM with a sample taken from the slab with a syringe and measured with a conventional EC meter the latter value will be about 10 higher Note The specifications apply when taking measurements in water containing nutrients Deviations may occur in substrates depending on the type of substrate and the salts present 10 Troubleshooting No measurement value or signal appears on Extreme measurement values WC EC or T display of mainbox or buffer on display of buffer Check to make sure that the red green LED Extreme temperature readings high or low on the front side of the mainbox is lit up indicate a defective temperature sensor Check to make sure that the adapter is Extremely divergent values or unstable connected to the power mains and delivers readings one after another power The red LED on the front side of the main box regularly turns red No measurement value or signal on di
18. to ensure that the range of the inputs to the WCM is compatible with the outputs generated by the WCM i e the water content should be scaled to a range of 0 100 the EC to a range of 0 20 and the temperature to a range of 0 50 Incorrect settings will result in the transmission of incorrect measurement values to the computer Tip 9 Check the positions of the dip switches before switching the power on Important Check to make sure that the and of the power supply are correctly connected to the input termi nals on the mainbox It is also important to make sure that the relevant wires between the mainbox and the buffer which transmit the power supply are also correctly connected As this meter makes use of a 48 VDC adapter an incorrect connection will cause damage to the system Check the con nections of the wires in the mainbox and buffer before switching on the power When carrying out repairs or maintenance on the meter always dis connect it from the power supply Figure 5 The dip switches for the ana logue outputs Appendix III Figure 6 The jumpers for the analogue outputs Appendix III 6 3 Checking the operation On the front side of the mainbox you will find 3 LEDs LED is an on off switch for WC LED 2 is an optional alarm sign for a low WC LED 3 lights up green if the meter is operating properly power voltage and lights up red if something is wrong When starting up the meter too LED3 will light up
19. ver for errors in this publication nor for their consequences Figure I Schematic diagram of the WCM continuous A The sensor B Cable between sensor and buffer C The buffer mounted on the stand D Cable between the buffer and mainbox variable length maximum length 2000 metres 2x twisted pair shielded cable not included E The mainbox with main printed circuit board F Covered cables WC EC and T between the main box and the computer or satellite recommended maximum length of 3 metres G The adapter Photo I The components of the WCM continuous 2 grotop Master m SI E ZF grotop Master m 77 E Appendix Figure 2 View of the mother board in the mainbox Display current values for WC EC and T 2 Connection for servicing purposes 3 Pump LEDs 4 Status LEDs 5 e Alarm LED 6 VCC and GND see figure 4 7 Cable to adapter 8 Cable to computer 9 Battery 10 Status LEDs OK green reset error red Il Cable to buffer 12 See figure 3 13 See figure 6 14 See figure 5 15 Cable for extention optional Figure 3 A Connection 20 and 21 power input B Connection 22 27 ana logue output to computer Figure 4 The buffer connection to connector 2 CON2 da gt B SERERERE EERE x i ae R46 T EC EC d qena RILE 238 RIL B WG C52 MENTI 242 DA Lr WG Appendix Il Figure 5 The
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