KUDU Variable Frequency Drives
For progressing cavity pumps
APPLICATIONS The high-performance KUDU variable frequency drive (VFD)
■■ Progressing cavity pump (PCP) enables sophisticated motor control with speed and torque
installations in accuracy, low harmonics, and smooth speed ramping, thereby
●● heavy, medium, and light oil wells
maximizing motor performance. The system enhances safety
●● water wells through controlled stopping and braking, limiting of maximum
●● coalbed methane and conventional speed, and direction management.
gas wells (for dewatering)
●● high-water-cut and
Systems are available for all major voltage levels and both
high-sand-cut environments 50 Hz and 60 Hz. Enclosed in a NEMA Type 3R case, the VFD
●● highly corrosive wells
system can be configured in accordance with local compliance
●● thermal applications
standards worldwide.
●● horizontal, deviated, and vertical wells
KUDU Advanced VFD
BENEFITS KUDU Advanced VFDs combine the standard KUDU VFD with
■■ Lower energy consumption and an advanced controller and upgraded user interface to help
operational costs operators manage well performance. A full-color touchscreen with
■■ Extended PCP run life an intuitive interface facilitates configuration and well supervision.
Acquired data is stored on site and easily retrieved on a USB. The
■■ Enhanced safety KUDU Advanced VFD with KUDU
VFD can also be configured to enable remote administration by a PCP Manager well optimization
FEATURES† SCADA system. unit functionality.
■■ Torque limiting
The KUDU Advanced VFD is easily upgraded to include the KUDU PCP Manager* well optimization
■■ Autorestart after power loss unit’s functionality, resulting in a top-of-the-line well management system. Five production control
■■ Local data logging modes provide the highest level of PCP control, optimization, protection, and monitoring. This
■■ Modular system to suit advanced system helps operators understand well conditions, protects well equipment, increases
multiple applications energy efficiency, and optimizes production.
■■ Configurable to meet all major KUDU VFDs Features
compliance standards KUDU Advanced KUDU Advanced VFD with
KUDU VFD
VFD KUDU PCP Manager Unit
■■ 15 well-protection settings Soft start Yes Yes Yes
■■ Five control methods Torque limiting Yes Yes Yes
■■ Touchscreen interface for easy Autorestart capability Yes Yes Yes
Manual speed control Yes Yes Yes
programming and supervision
Well-protection settings Two Five Fifteen
■■ Stuck-pump and desanding routines Backspin timers Yes Yes
†See “KUDU VFDs Features” table for details PRESCO-SWITCH™ bypass timers Yes Yes
Data logging with 8-GB Secure Digital (SD) card Yes Yes
Real-time trending Yes Yes
Rod speed and rod torque display Yes Yes
RS485/RS232 and Modbus® TCP/IP communication Yes Yes
Stuck-pump routine Yes
Desanding† Yes
Bottomhole pressure (BHP) control‡ Yes
Dynamic liquid level (DLL) control§ Yes
Production optimization control†† Yes
Production target control†† Yes
Cold weather package to extend use to Yes Yes Yes
–13 degF [–25 degC]
Cellular package for remote communication Optional Optional Optional
Backspin control without power Optional Optional Optional
†Requires surface flowmeter or downhole instrumentation ‡Requires downhole instrumentation
§Requires surface pressure sensor and downhole instrumentation ††Requires surface flowmeter
KUDU VFDs
KUDU VFDs Specifications
Drive rating, hp [kW] 30 [22] 75 [56] 100 [75]
Output rating, kVA at 480 V 28.6 70 93.7
Output current, A 46.3 106 145
Ambient storage temperature, 14 to 122 14 to 122 14 to 122
degF [degC] [–10 to 50] [–10 to 50] [–10 to 50]
Dimensions H × W × D, in [cm] 47 × 24 × 26 55 × 36 × 27 55 × 36 × 27
[120 × 61 × 66] [140 × 155 × 168] [140 × 155 × 168]
Approximate weight, lbm [kg] 932 [423] 1,140 [517] 1,141 [517]
Principal Control Parameters
Motor control system Pulse-width modulation (PWM) with flux open-loop vector control
Input voltage 380 to 480 V ( –15% to 10%), 50 or 60 Hz (±5%)
Output voltage regulation ≤ Power supply voltage
Frequency setting 0.1 to 500 Hz, 0.1-Hz resolution
PWM carrier frequency 2 to 16 kHz adjustable
Input configuration 6-pulse diode
Efficiency 98% through speed range
Power factor 0.97 or better at nominal load
Overload rating 120% for 60 s
Enclosure and Environmental Ratings
Enclosure NEMA Type 3R (outdoor use); UL 508A service entrance rating
Cooling method Separate, air cooled with forced ventilation
Maximum altitude 3,330 ft [1,000 m] without derating; derating of the current by 1% for each additional
330 ft [100 m] up to an altitude of 15,748 ft [4,800 m]
Relative humidity 5%–95% with no condensation or dripping water, conforming to IEC 60068-2-3
H2S protection Protective coating on electronic cards
Enclosure material 12-gauge carbon steel
KUDU Advanced VFD and KUDU Advanced VFD with KUDU PCP Manager Unit Specifications
Processors CPU: 32-bit ARM7 microcontroller, 32-MHz clock, integrated watchdog timer
Microcontroller coprocessor, 20-MHz clock
Memory 16-MB flash ROM, 4-MB CMOS RAM, 4-KB EEPROM
Nonvolatile RAM CMOS SRAM with lithium battery retains contents for 2 years with no power
Event logging capacity 20,000 events
Maximum database points 1,000 typical
I/O
Analog inputs Eight: 0–20/4–20 mA, 0–5/0–10 V, software configurable
Analog outputs Two: 0–20/4–20 mA
Digital I/O 16 digital inputs: 12/24 V, 48 V, 115/125 V, 240 V
10 relay outputs: dry contact or DC solid-state
Dry contact rating: 3 A, 30 VDC or 240 VAC (resistive) DC solid-state rating: 3 A, 60 VDC
Counter inputs One: 0–10 Hz or 0–5 kHz (dry contact) Two: 0–10 kHz (turbine or dry contact)
Communications
Serial port COM3 RS-232 port, 8-pin modular RJ45 jack, full or half duplex with RTS/CTS control and operator
interface power control
Serial protocols DNP3 slave, DNP3 master, IEC60870-5-101 slave, IEC60870-5-103 master,
Modbus RTU slave, Modbus RTU master, DF1
Touchscreen Interface
Display type Thin-film-transistor (TFT) color LCD
Display size 5.7 in
Resolution 320 × 240 pixels (QVGA)
Touchpanel service life 1 million taps or more
USB interface USB 2.0 (Type A)
Local storage SD card slot (maximum 32-GB SD/SDHC Class 10 card)
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