Summary of Contents for GDD Instrumentation TxIII
- Page 1 IP Transmitter Model TxIII 1800W-2400V-10A Instruction Manual 1963 rue Frank-Carrel, suite 203 Québec (Qc) Canada G1N 2E6 Tel.: (418) 478-5469 E-Mail: info@gddinstruments.com Web site: www.gddinstruments.com...
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Page 3: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ............................17 SAFETY ..............................17 TRANSMITTER DESCRIPTION ......................17 ..............................17 QUIPMENT LIST ..........................17 RANSMITTER COMPONENTS 3.2.1. Output Terminals ..........................17 3.2.2. Status LEDs ............................17 3.2.3. Ohmmeter and Wattmeter Display ..................... 17 3.2.4. Current Display ............................ 17 3.2.5. -
Page 4: Introduction
The GDD Tx III transmitter can be powered directly from a 120 VAC power source (240 VAC optional), such as a portable regulated generator. The TxIII transmits up to 10 A in a highly conductive ground or sends up to 2400V in a resistive ground for a total power of 1800W. -
Page 5: Transmitter Description
3. TRANSMITTER DESCRIPTION Equipment list When receiving a GDD 1800W-2400V-10A IP Transmitter, model TXIII, ensure that it contains the following elements: One (1) TxIII transmitter built in a transportation box from Pelican One (1) instruction manual One (1) GDD Safe operating procedures (SOP) ... -
Page 6: Transmitter Components
3.2 Transmitter components 6- Time Output Status Ohmmete Current High Base / DC Power Master/Slav Termin LEDs Display Voltag Selector Cable e interface Wattmete Optional Indica Display 12- Power switch: ON Cancel (1.5x) / OFF / Open Vent Serial Warning Circuit Turbo Voltage... -
Page 7: Output Terminals
HIGH VOLTAGE: This LED turns ON and OFF to indicate the presence of high voltage on the output terminals, allowing the operator to follow the TxIII transmission cycle. MASTER: This LED lights up for two reasons: when the transmitter is in stand-alone or in MASTER configuration. -
Page 8: Power Cable
turning the rotary. 3.2.7. Power Cable The termination of the power cable can be plugged into any 120 VAC / 60 Hz voltage source. The rated input voltage can be modified upon request to 220-240 VAC / 50-60 Hz. Please check transmitter’s nameplate for specificity. -
Page 9: Power Switch: On (1.5X) / Off / On (1.0X)
There is a built in circuit breaker to protect the instrument from overload. 3.2.14. Cancel O.L.P. Switch (open loop protection) The GDD TxIII has an internal open loop protection circuit to prevent direct electric shock to the operator. This protection is triggered when the electrodes are not connected to the output terminals or when the current is less than 30 mA. -
Page 10: Transmitter Operation
If a generator more powerful than 1800W is used, the output power will be limited to 1800W by the TxIII. If the generator used cannot deliver up to 1800W, such as a 700W generator, the output power will be limited by the generator. -
Page 11: Master / Slave Mode
5. MASTER / SLAVE MODE Here are the basic steps for a Master/Salve operation of the TxIII: 1. Connect the yellow synchronization cable (Master/Slave) to the transmitters. The Master/Slave cable terminations are different: one is labeled MASTER and the other one SLAVE. - Page 12 5. Make sure that the voltage selector is at the minimum scale (150V) on both transmitters. 6. Put the 1.0X / 1.5X switch to the 1.0x mode. 7. Gradually increase the output voltages from one transmitter to the other until the transmitters stop.
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Page 13: Troubleshooting
6. TROUBLESHOOTING With a good understanding of the transmitting circuit and a little logic, most of the problems that will happen with the Tx III can often be solved. 1- Nothing seems to work The ON LED doesn’t light up and the display remains blank: check if the power source (generator) is working properly. -
Page 14: Technical Help
3- The TxIII works well but the output power is very low First, check if it is possible to increase the voltage. Every time you increase the voltage scale by one step, the output power is approximately doubled. It is therefore possible to send 1000 W at a given scale (e.g.: 2000 mA at 500 V) but the Tx III will stop transmitting on the next higher... - Page 15 If you encounter a problem that can’t be fixed or that is not described in the troubleshooting section, or for any particular information, don’t hesitate to contact Instrumentation GDD : Phone: (418) 478-5469 e-mail: info@gddinstruments.com Any GDD Tx III transmitter that breaks down while under warranty or service will be replaced free of charge upon request for the duration of repairs, subject to instruments availability, except for shipping charges.
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Page 16: Specifications
8. SPECIFICATIONS Size: Packing case: 56 x 35.5 x 56 cm (22.00" x 14.00" x 22.00") Transmitter only: 50 x 30.5 x 45.7 cm (19.70" x 12.00" x 18.00") Weight: Packing case: 12 kg (26.5 pounds) Transmitter only: 26.5 kg (58.5 pounds) Operating temperature: C to 65 C (-40... -
Page 17: Glossary
9. GLOSSARY Induced polarisation (IP) is a geophysical technique: an electric current is induced into the ground and the voltage decay is monitored trough electrodes to measure its conductivity and chargeability. The GDD Tx III is one of the principal components for an I.P. survey system. Short circuit: Very low resistance connection between two nodes resulting in a fault current.