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AKM42G-EKCN2-00 Kollmorgen

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The Kollmorgen AKM42G-EKCN2-00 is part of the AKM Synchronous Servo Motors series. This servo motor features a frame dimension of 84mm and an open keyway shaft detail. It comes standard with 2 SpeedTec Ready connectors and uses a Comcoder feedback system with 2048 lines per revolution and single turn optical feedback.

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Product Description:

The AKM42G-EKCN2-00 is a rotary servo motor manufactured by Kollmorgen for the AKM Synchronous Servo Motors series. In automated lines, it operates as a closed-loop drive element that delivers commanded torque and position to a mechanical axis, allowing coordinated motion with millisecond response times. Its synchronous design lets the drive regulate speed and position with stable response during start-stop cycles and short indexing moves. The motor belongs to the 42 frame class and uses the internal G winding, pairing with matched AKD drives so mid-voltage bus levels can reach the rated speed range needed for material handling, light machining, and indexing equipment.

The stator stack is housed in a body that measures 84 mm across the mounting face, giving a compact footprint for tight machine layouts. Position feedback is carried by a Comcoder that outputs 2048 lines per revolution, enabling interpolated resolution well below one arc minute. The device and the drive exchange signals through two SpeedTec Ready connectors, and the keyed design shortens cable changes in modular machines. This connector arrangement keeps power and feedback connections organized at the motor body, which helps maintain clean routing in compact machine assemblies. Because the motor is supplied without a brake, load holding must be provided by the drive or by external mechanics when power is removed. The housing supports the thermal load for this rotor length, so continuous torque is maintained without forced cooling.

Signal integrity is supported by the encoder's single-turn optical structure, and its protocol is identified as EPC 15T for direct recognition by compatible Kollmorgen controllers. This feedback arrangement supports accurate commutation and repeatable positioning during reversals and low-speed operation. The shaft exits the front bearing with an open keyway profile, allowing rigid coupling to timing pulleys or gear hubs. At the factory, this unit is built to the standard customization level, so its mechanical options follow the baseline configuration. Its short rotor construction also keeps inertia compatible with high-bandwidth loops when command profiles include rapid speed reversals.

Brake System
Without brake
Connector Arrangement
2 SpeedTec Ready connectors
Customization Level
Standard
Feedback Resolution
2048 lines/rev
Feedback System
Comcoder
Feedback Turns
Single turn, optical
Feedback Type
EPC 15T
Frame Dimension
84mm
Product Family
AKM Synchronous Servo Motor
Rotor Length Index
2
Shaft Detail
Open Keyway
Winding Designation
G
  • AKM-42G-EKCN2-00
  • AKM42G-EKCN2-OO
Fault Code What it means
F301 – Motor overheated Internal thermal sensor says the windings or case are above the safe limit.
F302 – Over-speed Actual shaft speed has exceeded the VL.THRESH limit.
F305 – Brake open-circuit Drive cannot pull ≥ 200 mA through the motor-brake coil when energized.
F308 – Voltage exceeds motor rating DC-bus voltage is above the motor’s name-plate limit.
F402 – Analog signal amplitude fault Resolver or sin/cos feedback amplitude is out of range.
F403 – EnDat communication fault Serial feedback packets not received within timeout.
F404 – Illegal Hall state (111/000) Hall sensors show an impossible pattern.
F418 – Primary feedback power-supply fault 5 V / 7 V supply to encoder/resolver has collapsed.
F421 – Resolver sensor fault (SFD) Motor’s built-in resolver self-diagnostics reports an error.
F312 – Brake released when it should be applied Mechanical brake unexpectedly disengaged during “brake-on” state.
Spec  AKM42G-EKCN2-00 AKM42C-ANCNEH-01 AKM42E-ANCNR-00 AKM42H-ANCNR-00 AKM43E-ANCNR-00 AKM43G-ANCNR-00
Frame Size 84 mm 84 mm 84 mm 84 mm 84 mm 84 mm
Winding code G C E H E G
Continuous stall Tcs 3.53 Nm 3.35 Nm 3.42 Nm 3.54 Nm 4.70 Nm 4.80 Nm
Rated speed ωr 6 000 rpm 1 500 rpm 3 500 rpm 6 000 rpm 2 500 rpm 5 000 rpm
Peak stall Tps (5 s) 8.0 Nm 9.4 Nm 8.4 Nm 11.6 Nm 11.7 Nm 10.9 Nm
Max mech. speed ωmax 6 000 rpm 2 510 rpm 4 790 rpm 6 000 rpm 3 500 rpm 6 000 rpm
Cont. current Ics 4.8 Arms 1.4 A 2.74 A 3.6 A 2.76 A 4.87 A
Rotor inertia J 1.45 kg cm² 1.45 kg cm² 1.45 kg cm² 1.45 kg cm² 2.09 kg cm² 2.09 kg cm²
Error / Symptom Probable Cause(s) Recommended Troubleshooting Steps
Drive will not enable (motor never energizes) ENABLE hardware line not asserted; “software enable” bit false; safety relay open  Verify 24 V logic supply and ENABLE signal are present in the AKD/other drive. Check PLC/fieldbus command word for the software-enable bit.
Motor fails to rotate after enable Brake still clamped; mechanical jam; set-point cable fault Confirm holding-brake release voltage through the motor’s brake connector. Check for shaft obstructions or load binding. Inspect set-point/command wiring for breaks.
F20x / “Over-current” fault Shorted phase lead; sudden load spike; acceleration ramp too aggressive Measure phase-to-phase insulation and repair wiring. Reduce load inertia or update motion profile (longer accel). 
F14x / DC-bus over-voltage Regen energy on rapid decel; mains voltage high Lengthen decel ramps; activate or size regen resistor pack; verify mains voltage.
F15x / DC-bus under-voltage Mains drop or loose supply lead Measure incoming VAC; tighten terminals; check fusing or breakers feeding the drive. 
F402 “Encoder/feedback fault” Resolver/encoder amplitude out of range; mis-alignment; broken feedback cable Scope resolver/encoder signals at X10. Realign feedback hub; replace or re-terminate cable if noise present.
Phase loss / phases swapped (motor chatters or hums) One motor phase open or incorrectly sequenced Verify U-V-W continuity and tighten power leads. Swap any two phases to correct rotation if sequence wrong. 
Excessive vibration & noise Bearing wear; rotor imbalance; shaft-to-load misalignment Inspect & replace worn bearings; align coupling; balance rotor if needed. 
Position drift / hunting oscillation Encoder noise; tuning gains too high; inertia mismatch Check encoder counts manually; lower servo gains; verify load inertia ratio.
Over-temperature trip / smoke or burning odor Blocked airflow; excessive duty cycle; stator short Clean cooling vents; add forced air if motor case exceeds 120 °C. Run a winding-insulation (megger) test; schedule service if insulation is <1 MΩ

Frequently Asked Questions about AKM42G-EKCN2-00:

Q: What type of shaft detail does the AKM42G-EKCN2-00 feature?

A: The AKM42G-EKCN2-00 servo motor is equipped with an open keyway shaft.

Q: What type of feedback system is used in the AKM42G-EKCN2-00 servo motor?

A: This model utilizes a single-turn optical Comcoder feedback system.

Q: What is the feedback resolution of the AKM42G-EKCN2-00?

A: The feedback resolution for this servo motor is 2048 lines per revolution.

Q: Is the AKM42G-EKCN2-00 servo motor equipped with a brake?

A: The AKM42G-EKCN2-00 does not include a brake system.

Q: How many connectors are included with the AKM42G-EKCN2-00 and what type are they?

A: This unit provides two SpeedTec Ready connectors for electrical connection.


Internal Product Review

  • ‘‘The AKM42G-EKCN2-00 is a Kollmorgen AKM synchronous servo motor with a Comcoder feedback system and 2048 lines/rev resolution. Single-turn optical feedback and an open keyway shaft support accurate motion control and straightforward mechanical integration. A standard configuration with 2 SpeedTec Ready connectors makes this motor a strong choice for clean servo installation.’’

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