SURFACE CONTROL
Variable speed drives
Variable speed drives (VSDs) for geothermal and oilfield ESP systems. Motor control, monitoring, protection and power ratings are matched to the selected equipment.
SURFACE DRIVE EQUIPMENT
Control the pumping system.
| Parameter | Catalogue specification |
|---|---|
| Input voltage | 380 / 480 V AC |
| Input frequency | 47–63 Hz |
| Output frequency | 5–500 Hz |
| Short-term overload | 120% for 1 minute |
| Communications | RS485 / Modbus; SCADA and I/O |
| Filtering | Sine-wave filter |
GEOTHERMAL / VSD DETAILS
Electrical ratings & interfaces.
| Parameter | Catalogue specification |
|---|---|
| 380 V input tolerance | −25% / +25% |
| 480 V input tolerance | −25% / +10% |
| Output frequency resolution | 0.1 Hz |
| Drive current range | 63–1,837 A |
| Input pulse options | 6 / 12 / 18 pulse |
| Maximum ambient temperature | 55 °C |
| Minimum temperature with heaters | −40 °C |
| Enclosure options | NEMA 3R / NEMA 4 |
| Serial interface | RS485, 9.6–115 kbps; Modbus Slave |
| Analogue interfaces | 0–10 V / 4–20 mA |
| Digital interfaces | 24 V DC |
| Logs | Fault and event logging; USB access |
The catalogue describes stuck-pump start and shaking functions, gas-lock ride-through and compatibility with induction and permanent magnet motors.
OILFIELD VARIABLE SPEED DRIVES
Motor control matched to the oilfield duty.
Oilfield ESP systems use the same types of variable speed drive control stations as geothermal installations, generally at lower power ratings. The drive is selected together with the motor and pump duty.
Size the drive
Confirm motor type, power, voltage, current, operating-speed range and the available electrical supply for the selected oilfield installation.
Define control and protection
Agree the monitoring, protective functions, communications and filtering requirements with the selected motor and surface system.
Request the electrical ratings for the selected oilfield drive. The geothermal reference specifications describe the geothermal configuration.
Need help selecting this equipment?
Share your operating conditions and project requirements.