CS, CS-R, FK

Summary

Product Identification

Calpeda CS, CS-R, and FK series submersible motors are available in 4”, 6”, 8”, and 10” sizes. They are built with advanced technology and superior quality components to ensure good mechanical strength and excellent electrical reliability.

• CS, CS-R Series: Rewindable motors.
  • CS 4” motors use a special food-grade dielectric fluid that provides a better lubricant effect, increasing the life of moving parts and copper wires.
  • CS-R 6/8/10” motors are in a water bath with polyvinyl chloride coated wire.
  • All CS, CS-R motors are NEMA STANDARD and can be rewound, allowing easy access for maintenance and repair.
  • Standard construction: CS, CS-R.
  • AISI 316 construction: I-CS, I-CS-R.
• FK Series: Encapsulated motors, manufactured to ISO 9001 standards.
  • Feature an hermetically sealed stator where self-healing stator resin prevents motor burn-out.
  • Designed for high electrical efficiency, low cost, and a non-contaminating water-filled design.
  • Water-lubricated thrust and radial bearings allow maintenance-free operation.
  • A special diaphragm ensures pressure compensation inside the motor.
  • Removable “Water Bloc” lead connector is used for facilitating connection.
  • FK 6/8” models include a sand fighter with SiC-Mechanical Seal for increased performance in sand.
  • Standard construction: FK.
  • AISI 316 construction: I-FK.

Operating Limits

All motors are designed for continuous duty.

CS, CS-R Series

• 4CS (all types):
  • Max. Liquid Temperature: 35 °C
  • Minimum Cooling Flow Velocity: 0,08 m/s
  • Max. Starts per Hour: 20
• 6CS-R:
  • 4÷11 kW: 30 °C, 0,1 m/s, 15 starts/hour
  • 13÷15 kW: 30 °C, 0,2 m/s, 15 starts/hour
  • 18,5 kW: 25 °C, 0,2 m/s, 15 starts/hour
  • 22÷30 kW: 25 °C, 0,2 m/s, 13 starts/hour
  • 37 kW: 40 °C, 0,1 m/s, 13 starts/hour
  • 45 kW: 40 °C, 0,3 m/s, 6 starts/hour
• 8CS-R:
  • 30÷45 kW: 25 °C, 0,3 m/s, 10 starts/hour
  • 51÷75 kW: 25 °C, 0,3 m/s, 8 starts/hour
  • 92 kW: 25 °C, 0,3 m/s, 6 starts/hour
• 10CS (all types):
  • Max. Liquid Temperature: 25 °C
  • Minimum Cooling Flow Velocity: 0,50 m/s
  • Max. Starts per Hour: 10

FK Series

• 4FK:
  • Max. Liquid Temperature: 30 °C
  • Minimum Cooling Flow Velocity: 0,08 m/s
  • Max. Starts per Hour: 20
• 6FK:
  • 4 ÷ 30 kW: 30 °C
  • 37 ÷ 45 kW: 50 °C
  • Minimum Cooling Flow Velocity: 0,16 m/s
  • Max. Starts per Hour: 20
• 8FK:
  • Max. Liquid Temperature: 30 °C
  • Minimum Cooling Flow Velocity: 0,16 m/s
  • Max. Starts per Hour: 10

For operation with higher temperatures, contact the Technical Sales Department.

Electrical

• Motor Type: 2-pole induction motor, 50 Hz (n ≈ 2900 rpm).
• Sizing: Sized for connection to pumps according to NEMA Standards.
• Standard Voltages:
  • Single-phase: 230 V - up to 2,2 kW for 4” motors.
  • Three-phase (4” motors): 230 V; (5,5 kW excluded) 400 V.
  • Three-phase (6-8-10” motors): 400 V; 400/690 V.
• Voltage Tolerance: +6% / -10%.
• Starting Requirements: For rated motor powers equal to or higher than 7.5 kW, one of the following starting types is necessary: star/delta, soft starter, stator impedance, or autotransformer.
• Insulation Class:
  • CS, CS-R: Class F for 4” motors, Class E for 6-8” motors, PVC coated wire for 10” motors.
  • FK: Class B for 4” motors, Class F for 6”-8” motors.
• Frequency Converter Operation:
  • CS, CS-R: Suitable (4” single-phase excluded).
  • FK: Suitable.
• Protection: IP 68.
• Initial Cable Specifications:
  • CS Series:
    • 230V - 1~: 4CS 0,37 ÷ 2,2 kW, 3x2 + 1G2 mm², 2 m.
    • 400V - 3~: 4CS 0,37 ÷ 1,5 kW, 3x2 + 1G2 mm², 2 m; 4CS 2,2 ÷ 5,5 kW, 3x2 + 1G2 mm², 3 m.
    • 6CS-R 400V - 3~: 4 ÷ 11 kW, 3 x (1x2,5) mm², 3,5 m; 13 ÷ 22 kW, 3 x (1x4) mm², 3,5 m; 26 - 30 kW, 3 x (1x6) mm², 3,5 m; 37 - 45 kW, 3 x (1x10) mm², 3,5 m.
    • 8CS-R 400V - 3~: 30 ÷ 45 kW, 3 x (1x16) mm², 4 m; 51 - 92 kW, 3 x (1x25) mm², 4 m.
    • 10CS 400V - 3~: 85 kW, 4G25 mm², 6 m; 110-130 kW, 4G35 mm², 6 m.
    • 10CS 400/690V - 3~ Y/Δ: 150 kW, 3x25 + 4G25 mm², 6 m; 185 kW, 3x35 + 4G35 mm², 6 m.
  • FK Series:
    • 230V - 1~: 4FK 0,37 ÷ 2,2 kW, 3x1,5 + 1G1,5 mm², 1,5 m.
    • 400V - 3~: 4FK 0,37 ÷ 1,5 kW, 3x1,5 + 1G1,5 mm², 1,5 m; 4FK 2,2 ÷ 5,5 kW, 3x1,5 + 1G1,5 mm², 2,5 m.
    • 6FK 400V - 3~: 4 ÷ 22 kW, 4 G 4 mm², 4 m; 30 - 45 kW, 3x8,4 + 1G8,4 mm², 4 m.
    • 8FK 400V - 3~: 30 ÷ 45 kW, 3x8,4 + 1G8,4 mm², 8 m; 55 ÷ 93 kW, 3 x (1x16) mm², 8 m; 110 ÷ 150 kW, 3 x (1x35) mm², 8 m.
• Maximum Cable Lengths: Detailed tables are provided for maximum cable length based on motor current (IN), cable cross-section (mm²), and voltage (230V 1~, 230V 3~, 400V 3~, 400V 3~ Y/Δ) for both direct and star-delta starting. These tables assume a maximum voltage drop of 3% and a cable temperature of 80 °C, with water installation similar to air installation at +30 °C. See the official PDF for exact tabulated values.
• Cable Calculation: A method for calculating the minimum cross-section area of the phase conductor is provided, considering rated voltage (V), motor current (A), cable length (km), power factor (cos ϕ), and ambient temperature (°C). The voltage drop (DU%) should not be greater than 3%.
• Control Panels: A range of control panels are available for single-phase (M COMP, PFC-M, QML/A 1 D, QML 1 VFT) and three-phase (T COMP, PFC-T, QTL/A 1 D, QTL 1 D FTE, QTL/A 1 ST FT, QTL 1 ST FTE, QTL 1 SS E, QTL 1 IS FTE, QTL 1 VFT) submersible motors. These panels offer various starting methods (direct, Y/Δ, soft starter, stator impedance, variable speed) and protection features, including dry-running protection via power factor control, level probes, or a patented air cushion system. See the official PDF for detailed specifications of each control panel type and model.

Mechanical / Hydraulic

• Motor Sizes: 4”, 6”, 8”, 10”.
• Cooling: To ensure suitable cooling, an external cooling jacket must be installed to create a cooling flow around the motor when installed below the well inlet points or in tanks, lakes, or basins.
• Materials of Construction:
  • 4” Motors (CS & FK):
    • External frame: Cr-Ni steel AISI 304 (Standard), Cr-Ni-Mo steel AISI 316Ti (4” FK AISI 316).
    • Motor flange: Cr-Ni steel AISI 304 (Standard), Cr-Ni-Mo steel AISI 316L (4” FK AISI 316).
    • Shaft end: Cr-Ni-Mo steel AISI 316 (4” CS), Cr-Ni steel AISI 303 (4” FK Standard), Cr-Ni-Mo steel AISI 329 (4” FK AISI 316).
    • Thrust bearing: Oil wetted (4” CS), Oscillating pads (4” FK).
  • 6”, 8”, 10” Motors (CS-R & FK):
    • External frame: AISI 304 (6”, 8” CS-R, FK Standard), AISI 316Ti (10” CS-R, 6”, 8” FK AISI 316), Cr-Ni-Mo steel AISI 316 (6”, 8” CS-R AISI 316).
    • Motor flange: Cast iron GJL 200 EN 1561 (6”, 8”, 10” CS-R Standard, 6”, 8” FK Standard supports), Cr-Ni-Mo steel AISI 316 (6”, 8”, 10” CS-R AISI 316, 6”, 8” FK AISI 316 supports).
    • Shaft end: Cr-Ni steel AISI 431 (6”, 8” CS-R Standard), AISI 316 (6”, 8” CS-R AISI 316), AISI 630 (6”, 8” CS-R AISI 316 from 30 to 93kW), AISI 329 (10” CS-R), AISI 429 (10” CS-R), Cr-Ni steel AISI 304 (6” FK Standard), Cr-Ni steel AISI 303 (8” FK Standard), Cr-Ni-Mo steel AISI 316 (6” FK AISI 316), AISI 630 (8” FK AISI 316).
    • Thrust bearing: Oscillating pads.
    • Bushings: Graphite (Bronze for 8”).

Performance Data

Detailed performance data, including rated power output (PN), rated current (IN), weight, power factor (cos ϕ), efficiency (η %), direct start characteristics (IA/IN, CA/CN), axial thrust, and capacitor values (for single-phase motors), are available in extensive tables for all CS, CS-R, and FK models. See the official PDF for exact tabulated values.

Special Features on Request

• Other voltage.
• Frequency 60 Hz.
• Higher liquid temperature.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

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