Stepper motor terminal, 50 V DC, 5 A, vector control

The AKT2G-SM-L50 EtherCATClosed***EtherCAT is an open, high-performance Ethernet-based fieldbus system. The development goal of EtherCAT was to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs Terminal is intended for stepper motors with medium performance range. The PWM output stages cover a wide range of voltages and currents. Together with two inputs for limit switches, they are located in the EtherCAT Terminal.

The SM-L50 can be adjusted to the motor and the application by changing just a few parameters. 64-fold micro-stepping ensures particularly quiet and precise motor operation. Together with a stepper motor and an encoder, the SM-L50 represents an inexpensive small servo axis.

The LEDs indicate status, warning and error messages as well as possibly active limitations.

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Technical Data

Technical Data AKT2G-SM-L50
Number of outputs 1 stepper motor, 2 phases
Number of digital inputs 2 limit position, 4 for an encoder system
Number of digital outputs 1 configurable for brake (0.5 A)
Supply voltage 8 … 50 V DC
Motor Current/Phase (RMS) values without fan cartridge ZB8610 3.53 A
Motor Current/Phase (RMS) values with fan cartridge ZB8610 4.59 A
Maximum output current without fan cartridge AKT2G-AC-FAN-001 5 A (overload- and short-circuit-proof)
Maximum output current with fan cartridge AKT2G-AC-FAN-001 6.5 A (overload- and short-circuit-proof)
Operating modes
  • Standard mode (velocity direct / position controller)
  • Field-oriented control (extended velocity mode / extended position mode)
  • Sensorless operation
  • Travel distance control (positioning interface)
Maximum step frequency 1000, 2000, 4000, 8000 or 16000 full steps/s (configurable)
Step pattern up to 64-fold micro stepping (automatic switching, speed-dependent)
Current controller frequency approx. 30 kHz
Encoder pulse frequency maximum 400,000 increments/s (4-fold evaluation)
Input signal voltage "0" -3 V … 2 V
Input signal voltage "1" 3.7 V … 28 V
Input Current typ. 5 mA
Diagnostics LED Warning strand A and B, error strand A and B, power, enable
Resolution approx. 5,000 positions in typical applications (per revolution)
Power Supply via the E-bus, encoder/driver stage: via the power contacts, motor: via terminal contacts
Current consumption from the E-bus typ. 140 mA
Electrical isolation 500 V (E-bus/signal voltage)
Support NoCoEStorage yes
Configuration no address setting required
Weight approx. 105 g
Permissible ambient temperature range during operation 0°C ... +55°C
Permissible ambient temperature range during storage -25°C ... + 85°C
Permissible relative humidity 95%, no condensation
Dimensions (W x H x D) approx. 27 mm x 100 mm x 70 mm (connected width: 24 mm)
Installation on 35 mm mounting rail according to EN 60715
Vibration / shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission according to EN 61000-6-2 / EN 61000-6-4
according to IECClosed"International Electrotechnical Commission" IEC is a not-for-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies/EN 61800-3
EMC category Category C3 - standard
Category C2, C1 - auxiliary filter required
Protection class IP 20
Installation position
  • without fan cartridge ZB8610: standard installing position
  • with fan cartridge ZB8610: standard installing position, other installing positions (example 1 & 2)
Approval CE cULus