Designed for ESP wells, our VSDs incorporate the latest technology and equipment to prolong the life of ESP equipment. Reducing operational and running costs together with keeping field personnel safe, our VSDs incorporate the latest in ESP technology. Available in 6 or 12 pulse options, with operational designs of up to 60 degrees Celsius they are the ideal solution for almost all sites. Our multi pulse options increase efficiency, reduce harmonics and are compatible with induction or permanent magnetic motors.

Modular design, Cost effective, Easy-to-use and Easy-to-maintain VSD

  • Separated power and control sections allow field staff to safely troubleshoot control, communication, or instrumentation issues without exposure to dangerous voltage sources.
  • Flange mounted drive module and air-conditioning units make it easy to be maintained and replaced when breakdown.
  • The controller consists of SCHNEIDER PLC and HMI, with various built-in application control program to meet the requirement of different Artificial Lift applications
  • Standard output sine wave filter is mounted in the filter section, cooled by fans. The sine wave filter is used in long power cable layout application e.g. ESP and ESPCP to prolong the cable and motor lifetime.
  • IoT module based on 3G/4G make it is easy to check the data via cell phone or PC terminal remotely.


  • Electrical Submersible Pumps and Electrical Submersible Progressing Cavity Pumps
  • Surface Pumps
  • Horizontal Pumping System
  • More reliable, efficient and safer
  • Saves footprint, operating and maintenance costs
  • Prolongs the lifetime of the downhole units
  • Minimises downtime of the surface equipment
  • Control components are sealed in a IP66 section and cooled by air-conditioning units
  • 6 pulse or 12 pulse VSDs
  • Ratings up to 1600A
  • Surge protective device and space heater for outdoor use
  • Standard output sine wave filter
  • Friendly operating interface
  • Friendly operating interface
  • ESP / ESPCP / HPS control program loaded onto the controller
  • Variety of options are available


Specifications & Features Environment Rating & Features
Input power supply 3 phase 380V to 480V ±10% Enclosure rating Junction box & main power sections: IP66 (equivalent to NEMA4)
50/60Hz ±5%
Input configuration options 6 or 12 pulse input Magnetics section: IP24 (equivalent to NEMA 3R)
Integrated passive harmonic filter
Input current protection Circuit breaker(s) Cooling system IP66: Air-conditioning unit, Heat sink
Input surge suppression IEC test classification/EN type: II/T2 IP24: Forced Air Cooling
Maximum continuous voltage: 350V (L-N) Altitude 0 to 1000m without derating, 1000m to 4000m with derating 1%/100m
ISCCR: 50kA (max. 200A gG)
Voltage protection level: 1500V Ambient operating temp degC -30 to 55
In: 20kA 8/20 μs Relative humidity 20% to 95% maximum (noncondensing)
Imax: 40kA 8/20 μs H2S protection Conformal-coated PCBs & bus bars
Harmonic mitigation Standard DC bus choke Material Carbon steel, the thickness is 2.5mm
Output voltage The same as power supply Line-side termination Circuit breakers lugs in power junction box
Output frequency 0.1 to 120Hz
Output waveform High performance Sinewave Load-side termination Lugs in power junction box
Motor control Constant or Variable Torque (V/F) Control termination Mounting plate on the dedicated swing door
Vector control
Motor technology Induction motor (IM) Safety features Emergency stop button
Permanent Magnet Motor (PMM) Electronic interlocks
Efficiency >97% at full load Separated power and control sections
Power factor 0.98 across entire speed range Backspin indication LED on the door
Overload rating 120% for 1 min of 5 min Prewired IO junction box
Certifications CE I/O Specifications & Features
Power system MTBF >86,000 hours Analog inputs (AI) Qty 2: 4-20 mA, resolution 12 bits
Frequency resolution Analog setting: 0.05% for Max. frequency Digital inputs (DI) Qty 5: DC24V, sink wiring
Digital setting: 0.01Hz Digital outputs (DO) Qty 4: Relay output, NC, up to 5A
Speed accuracy Analog setting: ±0.2% of Max. frequency Serial Communication Qty 1:RS485 Modbus Master (for DHS)
Digital setting: ±0.01% of Max. frequency
Qty 1:RS485 Modbus Slave (for SCADA)

We’d like to hear from you.

Established in 1978, OTDS has vast experience with a range of power distribution networks.

Contact us

+44(0)208 681 1223

Gatton Business Park
Wells Place