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PB Hybrid Servo System Overview PB servo systems combine a traditional stepping motor with closed-loop servo technology. This marriage of technologies results in a product with an excellent combination of low cost and high performance. The PB servo systems will not stall, have smooth velocity over the full speed range, are completely jitter-free at zero speed, and have faster settling time compared to a conventional ac servo. Point-to-point applications that require very high acceleration and deceleration are an excellent fit for PB servo systems. The PB servo systems accept the position command in "pulse & direction" or "clockwise/counterclockwise" format. The resolution can be programmed for 200, 800, 1600, 3200, 6400, or 12,800 pulses per revolution. The PB1 servo drives have complete built-in functionality including the handling of regenerative energy. Configuration is accomplished with one dip switch and three rotary switches. Standard cables for input power, motor power, and encoder feedback are available that have all the necessary connections made on both ends of the cables. There is also a screw terminal breakout board with connection cable to facilitate the user connections to the servo drives. A Selection Chart is also available to help you choose a system. Continuous output power ranges from 23 watts to 140 watts (with 48 VDC supply power). Each system operates to a maximum speed of 4500 r.p.m. The motors have a built-in 200 line (800 count per revolution) encoder and optional 24 VDC spring-set holding brakes (the size 11 motor does not have a brake option). Sanyo Denki PB servo systems are suitable for a broad range of applications including:
In general, look for applications where existing steppers are a performance issue or where servos are used with a very high-hit rate, fast settling time, and a zero stand-still motion requirement. Features: Pulse and direction position commands (or CW/CCW pulses) and programmable position resolution / Vibration Suppression (low-pass filter on position command) / Diagnostics / Tuning / Built-in Functionality Benefits: The PB1 drives can be user configured for position command signals as "step & direction" or "clockwise/counterclockwise" which allows use of the existing stepper system or motion controller. In addition, the PB1 drives allow the position resolution to be set to a variety of stepper standards including 200, 800, 1600, 3200, 6400, and 12800 pulses/revolution / The PB1 drives include a programmable filter to suppress mechanical vibration of the load. This results in smoother and quieter operation. / The PB1 drive includes a fault LED that is able to indicate eleven types of fault conditions. Two additional LEDs indicate power on and marker (index) pulse / The PB1 drives include switches for setting the position loop proportional gain, the position command low pass filter, and the velocity loop proportional/integral gain. There is even a mode that only allows the velocity loop integral gain below a certain speed level. / The PB1 drives are complete with a built-in regeneration control function to handle excess energy during motor speed reversals. The functionality and ultra-compact size of the PB1 drives tremendously reduces the electronic panel space. The PB1 drive family includes three models that operate from a 24 to 48 VDC input power supply. All PB1 drives have a uniform height and built-in regenerative energy processing. The PB1 drives are manufactured in an ISO-9001 facility and have UL, cUL, and CE marks. The PB1 drives provide for a traditional interface (pulse and direction or clockwise/counterclockwise position command). The PB1 drives have programmable functions including choice of input command method, position command low-pass filter, position loop gain, velocity loop proportional/integral gains, programmable resolution, and more. LEDs indicate faults, power on, and marker pulse active.
Fully Digital, with Simple Setup using Dip and Rotary Switches The compact servo motor (stepping motor with built-in encoder) are available in NEMA size 11 (28mm square), NEMA size 17 (42mm square), and NEMA size 23 (56mm square). All PBM motors can operate to 4500 r.p.m., include a built-in 200 line optical encoder, and have optional 24 VDC spring-set holding brakes - except the size 11 motor which has no brake option.
Important Notes:System rating is the continuous output power from the motor shaft rotating at 3000 RPM (48 VDC Input Supply). Motor inertia and weight are without the brake. The system cables must be purchased with the system. Mating connectors are not supplied with the drive or motor except as a part of the required cable sets.
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