This stepper drive with model number ending in -NF is designed to accept encoder feedback. Be sure to order a

compatible stepper motor with the encoder option (i.e. -WAA, -ZAA, or -YAA).

The ST5-Si-NF stepper drive is a DC-powered microstepping drive for controlling two-phase, bipolar step motors.

It offers advanced current control and a sophisticated 3rd generation anti-resonance algorithm that electronically

dampens motor and system resonances to improve motor smoothness and usable torque over a wide speed

range. The drive also employs electronic torque ripple smoothing and microstep emulation to greatly reduce motor

noise and vibration. The drive must be powered from 24-48 VDC and can output up to 5.0 A/phase (peak-of-sine)

to the step motor. Over-voltage, over-temperature and over-current protection features prevent damage while

running in adverse conditions. The drive is complemented by a specifically matched set of NEMA 11 through

NEMA 23 frame stepper motors (see Related and Recommended products below).

The ST5-Si-NF can operate in all of the same control modes as the Q models, plus it has the ability to run a stand-

alone Si program stored in non-volatile memory. Si programs are created using the Si Programmer™ software,

which provides unparalleled simplicity in indexer-drive programming via Applied Motion’s unique and powerful icon-

based programming environment. Preconfigured motor setup files included with Si Programmer™ make it easy to

set up the drive for optimum results.

For connecting to external devices such as control signals, incremental encoders, limit switches, proximity or

photoelectric sensors, PLC I/O, lamps, and other devices, the drive comes with 8 digital inputs and 4 digital

outputs. Adjustable digital filters are present on the digital inputs for enhanced reliability in noisy environments.

Note: 2 single-ended analog inputs, which can be wired together as 1 differential analog input, are also available,

but not in Si program mode.

The drive comes with an RS-232 port for configuration, serial communications and programming.

The ST5-Si-NF includes a quadrature 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

(marker) pulse.

The ST5-Si-NF also features a separate, buffered encoder output so that other devices can monitor the motor

position in real time.

All ST drives are CE approved and RoHS compliant.

Description