Rotary table ACR240HT-ABS

Direct Drive (DDR) rotary tables with absolute encoders provide superior angular positioning and are designed to eliminate backlash, friction and wear problems associated with worm, gear and belt drives. Low maintenance and high throughput characteristics of the Direct Drive stage yields the lowest total cost of ownership.

The major advantage between an absolute encoder and an incremental encoder is that the absolute encoder keeps track of its position at all times, and provides it as soon as power is applied. This feature is particularly useful in applications where the equipment has power turned off between uses. Incremental encoder does not provide any position information at start-up, but merely keeps track of how far it has moved. The only way to determine the absolute position of incremental encoders is to set the equipment to a known reference position and then zero the counters.

Rotary tables PSR300MHS-ABS and ACR-250HT-ABS are industry first direct drive rotary table that incorporates ABSOLUTE ring encoder with industry standard interfaces like SSI, BISS-C, FANUC

The motor and contactless absolute ring encoder are directly coupled to eliminate coupling backlash. The low inertia and zero backlash make these rotary tables the ideal solution in applications requiring position retention upon power-up.

System performance

Unit

PSR300MHS-ABS

Tabletop diameter

mm

290

430

Height

mm

42

68

Aperture

mm

145

238

Motor type

Three phase brushless

Y winding (standard)

Δ winding (optional)

Peak Torque                                    

Tp (Nm)

(note 1)

110

200

Continuous torque   

Tc (Nm)

(note 2)

42

100

Peak current

Amp

18

Continuous current

Amp

6

Absolute encoder: SSI, BISS, FANUS   

l

 (note 4)

Bits

Counts/rev

12

3,686,400

12

3,686,400

Axial load                 

Kg

(note 5)

50

300

Accuracy              

Arc-sec

10

5

Bus voltage

VDC

VAC

150

120

310

220

310

220

540

380

Max. speed @ Tp    

RPM

(note 6)

175

430

100

220

Rated speed @ Tc    

RPM

(note 6)

335

725

180

330

Bearing run-out  

Microns

 (note 7)

10-20

Stage weight

Kg

9

30

Construction

Rotor – steel

Stator - aluminum

Note 1

1sec. duration, coil at 20°C

Note 2

Coil at 120°C

Note 4

absolute single turn 10 bits and 12 bits, incremental 1Vpp 900 lines/rev

Note 5

Load capacity rated at 1/10 of bearing L₁₀ rating

Note 6

Rated speed based on amplifier bus voltage and motor “Y” winding.

Higher speed (Δ) winding on request.

Actual speed depends on the encoder resolution, interpolation factor and load.

Note 7

-P precision ABEC 5 bearing