DIGITAL DC DRIVES & SYSTEMS UPTO 5000 KW

1
Welcometo

• GEMCO CONTROLS LIMITED

www.gemcocontrols.com
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.

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.

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.

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.

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

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

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

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.

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.
11
Intelligent MCCs (iMCCs)

• Using intelligent motor protection Relays with
  Profibus/Ethernet communication formonitoring
  motor operating parameters and fault alarms.

12
CONTACT US -

• GEMCO CONTROLS LIMITED
• 14/3, Mathura Road, Faridabad-121003Haryana ( Ind
  ia)

91- 129 2274831, 2274832
91- 129 2271477
contact_at_gemcocontrols.com
www.gemcocontrols.com
Thank You