GEMCO Digital Convertors are dedicated for industrial applications in which good static and dynamic performance and independent controls of speed, acceleration, torque, tension etc. are essential.

1. Welcome
to
GEMCO CONTROLS LIMITED
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2. DIGITAL DC DRIVES & SYSTEMS UPTO 5000 KW
Digital DC Drives
GEMCO Digital Convertors are dedicated for industrial applications in which good static and
dynamic performance and independent controls of speed, acceleration, torque, tension etc. are
essential.
Various special features include :
 Auxillary transducers controls, encoders, inputs, dancer arms, load cells
etc.
 Choice of several operating & control modes.
 Automatic management of operating sequences.
 Serial communication with a PC or Gemco Video Keyboard.
 Serial communication amongst various drive units for cascade /
coordinated control.
 Various Programmable inputs and outputs :
 8 Digital Inputs and 4 Analogue Inputs.
 4 Digital Outputs and 2 Analogue Outputs.
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3.  Independent auxillary 24V DC power supply, allows use of wide range 3
phase supply, 110V-500V AC
 Speed feedback from Armature Voltage tachogenerator or pulse
encoder.
 Drive for multiple motors Machines with internal management of
special function as:
 Tension controls with Diameter calculation, inertia and friction
compensation etc.
 Synchronisation of sectional Drives with Draw / Ratio control.
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4. PROTECTIONS & SELF – DIAGNOSTIC
GEMCO Convertors are equipped with in built protection against various
abnormalities with clear indications. Various alarm levels programmable
through serial line include :
 Wrong sequence of three-phase line phases.
 Insufficient three-phase line voltage.
 Excessive three-phase line voltage.
 Phase currents unbalancing (Fuses Failure / Current Ripples).
 Integral current thermal motor protection (over loading).
 Minimum field excitation current.
 External motor protections (ventilation, thermostat).
 Excessive converter temperature.
 Unbalancing between reference and motor speed.
 Unbalancing between armature voltage and speed.
 Synchronism ramps error.
 Thyristor firing pulses error.
 EEPROM writing error.
 Wrong parameters in EEPROM.
 Wrong control circuits supplies.
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5. ANALOGUE DC DRIVES
 Very simple design.
 Dependable performance
 Easy maintenence.
 Long life.
 Several Drives operating trouble free for last over 25 years.
Salient Features of Gemco Thyristor Drive Panels
 Mains Isolator Switch/ ACB/ MCCB in the Incomming AC supply.
 Input AC supply variations upto ± 15% permitted.
 System immune to input supply phase sequence.
 Fully Controlled 6 Pulse / 12 Pulse Thyristor Convertors.
 Surge Voltage Suppression.
 Snubber Circuits across each power device provided.
 High Speed Fuses for Thyristor Protection.
 Electronic Over Current Tripping.
 Motor Overload Protection Relay Provided.
 Single Phasing Protection.
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6.  Field Failure Protection Relay Incorporated.
 Electronic Circuit to Indicate Blown Fuse.
 Adjustable Current Limit 0-150%.
 Gradual Acceleration of motor with adjustable ramp time of 2 to 30 seconds
 15. Line Reactors in each ac line provided for DI / DT protection
 Over Temperature Tripping
 Single Plug in Glass Epoxy PCB with latest electronic circuitary used to give
the desired performance.
 Front Accessible Test Points at various stages.
 Electronic Leds at various stages of circuits for easy fault diagnostics.
 Front Accessible and simple adjustments on the electronic card.
 Simple & Rugged circuitary for reliable and trouble free operation.
 front accessibility of all components permits very easy and quick trouble
shooting and rectification.
 Use of single card helps reduce down time as the card can be replaced
quickly even by an electrician.
 Selection of voltage or tachogenerator feedback.
 DC Voltmeter/ DC Ammeter / RPM Meter provided on front of panel.
 Eight Point Led fault display window on the front of panel.
 Optional Overvoltage / Undervoltage / Over Speed Tripping Offered
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7. SOFT STARTERS (25 AMPS TO 1000 AMPS)
Soft Starters
Microprocessor based heavy duty Soft
Starters from Gemco are highly reliable
and rugged using sophisticated
controllers from Fairford UK, with most
advanced features, which makes them an
instant selection leading to innumerable
benefits.
SALIENT FEATURES
 Continuous display of motor phase current & control status.
 Easily changed parameter settings via keypad.
 Peak starting current recording.
 User adjustable overload.
 Last 5 trips recording
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8.  110/230V control supply.
 User selectable built-in application specific settings.
 Isolated control inputs – 24V DC 230V AC for start/stop or user
programmable.
 Current limit time out – optional trip or continue.
 Undercurrent trip level or delay: 0-1 x FLC.
 Adjustable optimizing response rate.
 Adjustable starting current limit control.
 Separately adjustable ramp up/down times from 1 sec to 240 seconds.
 Adjustable kick start for high break away torque applications.
 Fully adjustable pedestal voltage.
 User adjustable shearpin.
 Control of resistive loads.
 Thermistor trip input.
 4-20mA input for monitoring.
 DC input for monitoring.
 Optional Serial Communications
 IP 20 Rating.
 An Alphanumeric Digital Display with soft keys for monitoring of operating
and setup parameters
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9. ADVANTAGES OF GEMCO SOFT STARTER
 Reduction in high starting currents
 Elimination of inrush currents.
 Smooth, stepless acceleration to full speed.
 Snatch free starting removing mechanical stress.
 Extended contactor life
 Reduced wear on mechanical transmission components.
 Automatic energy optimizing.
 Improved power factor at light loads, reduced kVA demand.
 Suitable for all types of induction motor.
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10. MOTOR CONTROL CENTERS(MCC'S)
For plant process motor controls
Gemco offers MCC Panels which are type tested at CPRI for
 Short circuit withstand capacity upto 70KA for 1 second
 Temperature rise test
 Degree of protection IP 54
The Panels can be fixed type or draw out type, single sided or double
sided as per Clients specifications, totally enclosed type, floor mounted,
dust and vermin proof. The construction of Panel is such that the cabling
& maintenance is easier & can be extended on both sides in future.
The bus bar used is Electrolytic grade aluminium / Copper well supported
with high quality SMC/DMC insulators.
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11. Intelligent MCCs (iMCCs)
Using intelligent motor protection Relays with
Profibus/Ethernet communication
formonitoring motor operating parameters and
fault alarms.
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12. CONTACT US :-
GEMCO CONTROLS LIMITED
14/3, Mathura Road, Faridabad-121003
Haryana ( India)
91- 129 – 2274831, 2274832
91- 129 – 2271477
contact@gemcocontrols.com
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Thank You