The STAC5-S-E120 stepper drive employs sophisticated current control designed for optimal smoothness over a
wide speed range. Anti-resonance, torque ripple smoothing, and microstepping work together to bring step motor
performance to a new high. To complement the drive Applied Motion offers a specially matched set of low-loss
NEMA 23 and 34 frame motors (see Related and Recommended Products below), all specifically designed with
high voltage operation in mind. Power to the drive comes from single-phase 120 VAC, and the drive can output up
to 5.0 A/phase (peak-of-sine) to the step motor. Protection features like over-voltage, over-temperature, and over-
current prevent damage while running in adverse conditions.
The STAC5-S-E120 can operate in pulse & direction, velocity, and streaming serial (SCL) control modes. Selecting
the control mode, setting up the motor, and configuring other drive parameters is done with the ST Configurator™
For connecting to external devices such as limit switches, proximity or photoelectric sensors, PLC I/O, lamps, and
other devices, the drive comes with 4 digital inputs, 2 digital outputs, and 1 analog input. The drive also features
an Ethernet port for configuration and communications. The Ethernet port is fast 10/100 Mbit, and the drive
supports both TCP and UDP communication protocols.
The STAC5-S-E120 comes with an encoder feedback connector for applications that demand a higher level of
position control than ordinary open-loop step motor systems can provide. Use our double-shaft step motors with
incremental encoders and activate either Stall Detection or Stall Prevention in the drive. Stall Detection notifies the
system as soon as the required torque is too great for the motor, which results in a loss of synchronization
between the rotor and stator, also known as stalling. Stall Prevention automatically adjusts motor speed to
maintain synchronization of the rotor to the stator under all conditions. This unique feature allows step motors to
operate in a much broader range of applications than previously possible, such as torque-control. The Stall
Prevention feature also performs static position maintenance, which maintains the position of the motor shaft when
at rest. Additionally, the inclusion of the optional encoder allows the motor to be precisely homed to the index
This step motor drive is UL Recognized (File No. E332730), CE approved, and RoHS compliant.