These bus terminals eliminate the need for small stepper motors
up to 200 W to have remote amplifiers. With a size of only 12
mm, the KL2531 Bus Terminal is designed for simple integration
into a 24-Vdc control-voltage system. Its peak current is 1.5
A/phase. KL2541 modules offer higher performance comparable to
that of small servodrives. They provide a peak current of 5 A to
generate a torque of 5 Nm in conjunction with a standard stepper
motor. The supply voltage of up to 50 Vdc enables high speeds
with torque. The KL2541 has an integrated incremental
encoderinterface. Both stepper-motor terminals provide two
controlled sine/cosine currents. A 25-kHz current-control
enables smooth current output without resonance. The current
resolution is 64 steps per period: 64-fold microstepping. A
standard motor with a 1.8° step angle runs smoothly and can be
set to up to 12,800 electronic positions per turn.  Beckhoff
Automation LLC 12204 Nicollet Ave. S Burnsville, MN 55337 (952)
890-0000