Diligent Micro Controls in Thane

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For more than 31⁄2 decades Diligent Micro Controls is in the field of developing and manufacturing custom-built electronic systems for industrial applications. Starting point for the development could be layman’s statement of prob ...Read More

Diligent Micro Controls

For more than 31⁄2 decades Diligent Micro Controls is in the field of developing and manufacturing custom-built electronic systems for industrial applications. Starting point for the developm... read more

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In continuous control of combustion process, it is required to adjust fuel and air in right proportioncontinuously according to the variation in the signal from pressure / temperature controller. However,relationship between fuel valve actuator and damper opening does not remain linear due to complex nature ofcombustion process. Hence, control signal received from controller has to be modified for optimum results ofcombustion. For this purpose, complete range is split in number of steps and each step can be multiplied byfactor which is expected to give optimum combustion results. Multiplying factor can be set at any valuebetween 0.5 – 1.5 independently for each step. Output signal is clamped to either minimum or maximumvalues whenever it tries to go beyond these values in any step. Diligent RATIOCON 4-20I 16 is one suchcontroller designed by M/s Diligent Micro Controls to accept 4 – 20 mA dc signal from either pressure /temperature controller and provide modified signal which is also lying in 4 – 20 mA range.This controller is housed in standard 96 x 96 mm plastic enclosure and it works on 230 V +/-10%, 50 hz, 1 phac supply.1. Description:‘Diligent Ratiocon 4-20 I 16’ accepts 4-20 mA signal at the input terminals on the rear panel of thebox. This range is split in 16 steps and 16 presets are provided to modify each step independentlywith multiplier between 0.5 to1.5. 16 LEDs are also provided and LED lights when the input signalcrosses the step value. Modified output of 4-20 mA, is provided at the out put terminals on the rearpanel of the box. When ever out put tries either to go below 4 mA or to go above 20 mA as a result ofmultiplying factor setting, internal circuit clamps output to 4 mA in the first case and 20 mA in thesecond case. Clamped status of <4 mA and > 20 mA is indicated by respective LED on the frontpanel. Rear panel has two terminals which have to be shorted together during Calibration Mode.Power supply Phase, Neutral & Earth are connected at the respective terminals on the rear panel. Thiscould either be 230 V or 110 V +/-10%, 50 hz, 1 phase AC. RATIOCON has 3 digit display whichnormally indicates the out put current signal and when the switch on left top corner is pressed itindicates the input current; either actual or calibration.2. Operation:Diligent RATIOCON becomes operational as soon as the a.c. power supply is connected to it.RATIOCON has two modes of operation; namely Calibration Mode and Normal Mode.MICRO CONTROLSRATIOCON operates in Calibration mode when corresponding terminals on the rear panel are loopedtogether. In this mode internal variable current source is connected to the input stage of RATIOCONand its out put can be varied by the knob located on right top corner. The value of this current can beread on the digital display by pressing the push button. Calibration procedure is as follows –a. Turn Calibration Adjustment knob fully anticlockwise till the current value drops below 4 mA.‘<4 MA’ LED will light as soon as out put current drops below 4 mA and out put current will beclamped to 4 mA.b. Turn the Cal. Adj. slowly in clockwise direction till the first step LED (marked ‘4’ on the panel)lights.c. Adjust preset below this LED to read the desired out put value on the digital display.d. Repeat ‘b’ & ‘c’ above for all the remaining steps.e. Continue to increase the calibration current beyond 20 mA. ‘>20 mA’ LED will light as soon asthe out put current tries to go beyond 20 mA. Out put current will be clamped beyond this at 20mA.f. This completes the calibration and the loop wired between two terminals on the rear panel cannow be removed.RATIOCON enters NORMAL Mode as soon as the loop wired for calibration, is removed. In thiscase input stage of RATIOCON now receives input signal directly and will generate out put signalaccording to the preset program.3. The connections details are given on the rear panel and are self explanatory.4. This instrument is not site maintainable.5. Diligent RATIOCON carries warranty for twelve months from the date of its delivery from ourworks. During this period, we undertake to repair/replace free of cost our defective unit in part or fullat our total discretion provided that such unit is brought to our works for rectification and collectedthere from after satisfactory inspection by the customer at his cost & risk and provided that the defectis due to poor material and/or workmanship and not due to misuse and/or mishandling. This warrantyis exclusively limited to the unit supplied by us and we shall not be responsible in any ways for any ofthe consequences of its use and/or misuse any where. This warranty shall automatically become null& void if our unit is opened/tampered by person not authorised by us.6. Specifications:Power Supply 230V or 110 V, 50 hz, 1 ph AC supplyInput Signal 4 – 20 mA dc.Input burden 100 ohms.Output Signal 4 – 20 mA dc.Output burden 400 ohms.Calibration current source InternalDigital Display 3 digitsOutput under / over range Output clamped to respective limits. ( Minimum at 4 mA& Maximum at 20 mA). Status LEDs providedModes of Operation Calibration and NormalSize Standard size 96 mm x 96 mm x 150 mm

DILIGENT RATIOCON 4-20 I 16

1. Discription:Stabmon is customized protection unit for 3-phase ac stabiliser. It is housed in strong & sleek m.s.enclosure. It operates on 230 V, 1 phase ac supply. Status & Fault LED display is provided on theunit and is very useful during commissioning and fault finding. Over load adjustment over 95% to105% of rated current, is provided on the unit. Local Reset Switch is provided to reset Stabmon afterit trips on fault. A toggle switch is provided to enable and disable ‘Single Phasing Protection’ andits status is indicated by the two-color LED.2. Operation:Stabmon require 230 V, 1 phase ac supply for its operation. 3-phase supply enters the unit atterminals Rs, Ys & Bs and leaves from terminals Rl, Yl & Bl for connection to load. Phase currentof each phase is monitored continuously. So long the current is present in all the three phases and isbelow the set limit, control relay inside is in energised state. Mains, Load and Fault LEDs arelighted. Status of ‘Single Phasing Protection’ is indicated by last LED. When the switch on the rearpanel is pressed, this LED becomes red and when that switch is released, color changes to green.3. Time-delayed Overload Protection :When any of the phase current exceeds preset limit for more than the permitted preset time (5sec.)continuously, Stabmon switches off internal control relay and latches it in this state. ‘Overload’ LEDlights. ‘T.DLY’ LED lights as soon as overload takes place and stays on till it last or till the elapse ofthe preset time, whichever is earlier. Overload adjustment is provided to adjust trip level from 95%to 105% of the rated current.4. Single Phasing Protection :Each phase carries current under normal condition and Stabmon continuously monitors it. Internalrelay remains energised so long all the three-phase carry current. However, when either one or twophases become open, internal relay switches off and is latched in this state. ‘Single PhasingProtection’ feature is different from the one understood conventionally. This is so because ACstabiliser is required to feed different loads from its phases and, therefore, currents in the phasescould be different. In extreme case, it may be required to operate with current in its one or two phasebeing zero or below the minimum sense level set for the circuit. In such case, Stabmon will notpermit its operation. Loads may be switched on/off randomly and this can cause load current to dipMICRO CONTROLS2below the minimum sense level momentarily. A short time delay of 2-3 sec. is provided to allowoperation with such short lasting dips in phase current.5. Reverse Phase Sequence Protection :Phase sequence of the 3-phase supply is continuously monitored. If the sequence is normal, Stabmonrelay stays in on state. However, whenever this sequence becomes reverse, relay switches off andstays off until sequence is corrected by interchanging any of the two phases. LED designated as‘REV. PH. SEQ.’ on the display, indicates this fault.6. Local Reset :Once Stabmon switches off internal relay and latches it in that state due to overload or single phasingfault, ‘Fault’ LED starts flashing and stabiliser is switched off. This state prevails until local resetpush button on the front panel, is pressed by operator.7. Calibration :Stabmon upto 10 Amps rating are directly calibrated and offered in our standard enclosures. For anyother higher current ratings, standard 5Amp Stabmon is calibrated with customer-specified auxiliarycurrent transformer.8. Status & Fault Display :Status & Fault display, is described below-Title DescriptionMains Lights when 230 V,1ph., ac supply is connected.Load Lights when one or more phases carry current.S. ing Lights when one or two phases are lost and current through thembecomes zero. It remains on even after tripping of Stabiliser, untilmanually reset by pressing local reset push button.O.Load Lights when current in any of the phases, exceeds preset limit beyondpreset delay (5 sec.). It remains on even after tripping of Stabiliseruntilfault is rectified and Reset Push Button is pressed.Rev.Ph.Seq. Lights when phase sequence is negative and remains on till it is madepositive by interchanging any of the two phases. It switches off onlyafter local reset push button is pressedT.DLY Lights as soon as current exceeds preset limit and remains on tillelapse of preset overload period or dropping of current below the limit.NOR- Steady This LED lights steady under normal condition and startsFLT - Blinks flashing after unit trips on fault.RED- S.ing Disabled This LED turns red when single phasing protection is disabledGRN- S.ing Enabled and it turns green, when single phasing protection, is enabled.

DILIGENT * STABMON

Diligent Thermocouple Welding Unit is housed in strong powder coated m.s. enclosure which hasshoulder strap for ease of carrying on site. It has rechargeable 12 V 4.5 Ah heavy duty Battery withinbuilt SMPS Battery Charger cum Power Supply. 1 meter long multi-strand thick copper cable withSilicon Sheath, Heavy duty Plier and strong circular Magnet are used to connect the Welding Powerto the Thermocouple Wires & the surface on which TC is to be welded. the unit has facility to set theWeld Energy Charge Level to suit different gages of Thermocouple wires. The SET Value andCHARGED Value are displayed on Bar Graph display. The desired Charge Level is set on the SETBar Graph using UP/DOWN push button. This Setting is remembered during operation. Wheneverwelding is to be done, command is given to start charging the unit to SET value by pressingmomentarily the CHARGE Button. Once the Charge level is reached to SET Value, the AUDIOalarm sounds indicating the readiness for welding. Welding operation is performed either inMANUAL mode or AUTO Mode. In Manual mode, the Thermocouple to be welded is firmly held inPliers at the desired spot, Magnet with wire is located nearer to this spot and then press the WELDButton after getting READY AUDIO ALARM.In AUTO Mode, Pliers holding TC Wires and the Magnet are positioned at the scheduled spot. Pressthe CHARGE Button. The charge builds up to the SET value and Audio Alarm sounds. Few secondsof this, WELD command is automatically given by Auto Circuit and Weld occurs. The pliers ismoved to next spot and the complete cycle repeats automatically. This is carried out till all the TCsare welded.A Bar Graph Display is also provided to indicate the CHARGE Level of battery when Battery PushButton is pressed. An Audio Signal sounds when battery drains below 10.5V (approx). It requiresrecharge for proper welding quality.The unit can also be operated directly from mains AC Supply if Battery is not available.Diligent Thermocouple Welding Unit size is 240 mm (L) x 170 mm (W) x 170 mm (H) and weighs4.5 kgs without battery12 V DC Battery is rated for 4.5 Ah. Its size is 90 mm (L) x 70 mm (W) x 100 mm (H) and it weighs1.5Kgs.Its useful Charge Level is 60 Volts and can reach up to 80 Volts under supply voltage conditions. Themaximum charge can be reached to 0.60 Coulombs.

DILIGENT THERMOCOUPLE WELDING UNIT

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For more than 31⁄2 decades Diligent Micro Controls is in the field of developing and manufacturing custom-built electronic systems for industrial applications. Starting point for the development could be layman’s statement of prob...Read More

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