Reliance Electric 1326AB-B430E-21, any servo drive to suit this?

[Splint]

Hi,
can anyone tell me what servo drives are available which handles step and direction signals which can be matched to a Reliance Electric 1326AB-B430E-21 AC servo motor?

Thanks
Splint

[salewis]

check out http://literature.rockwellautomation...p001_-en-e.pdf

The two key issues: one motor is "resolver" versus "encoder" not familiar with "resolver" motors, second motor needs 1.5 kw.

Now good news... See drives on ebay... Allen-Bradley, Parker... Just bought a 1.5kw drive for around $200.

Stan

[Splint]

Thanks Stan,
yes, I've not dealt wth resolvers before but I understand they essentially do the same job as an encoder but in a slightly different way, they are the part on the end of the motor and if need be then it would be possible to replace the resolver with an encoder, they're not very expensive.
The drives such as AB and Parker, I've never dealt with those type drives before, do they accept step and direction signals like those produced by Mach 3 etc. Is it difficult to set up and tune the drives? I'm really only familiar with Rutex drives.
On the motor requiring 1.5Kw, I suspect it would be possible to use a lesser powered drive, it would just mean the the motor would never run at its' maximum performance.

Thanks
Splint

[salewis]

Some of the drives accept step/dir inputs (these are velocity/positioning mode drives), others do not (these are speed-torque mode drives), and some are configurable either way.

The Parker Gemini GV-6U will accept step/direction. I know that because I bought a drive that was only speed-torque (mistake that cost $150). Also Lenze makes some, as well as Allen-Bradley (esp. 1398 series).

As for the resolver, I'm just getting into AC servodrives. Everything I'm looking at is hall&encoder. One is position(rotation) the other deals with commutation of motor fields.

Download the Gemini GV manuals from http://www.parkermotion.com/products...80_567_29.html and take a look...

I'm just starting out but hopefully by the end of next week, I'll have my laser cutter running on ac servos

stan

[DennisCNC]

I was thinking of using such motors for a project cuz their cheap, but don't want to mess with 380 or 460 volts.

[Splint]

That level of voltage for me personally is only an issue in the area of saftey. Rewinding a transformer to change the voltage is really quiet simple, the main concern is that other componants (where applicable) such as bridge rectifier, capacitors etc. are rated high enough for the increase in voltage. But yes, the $per Kilowatt ratio for these type motors is pretty low. I recently picked up half a dozen of these 1.4kw motors complete with high presicion reduction gearbox and timing pulley for US$80 each, I hope to use them in a project in the future. Just the thing for a large machine.

Splint

[salewis]

OK, unless I'm way oofff (been known to do that kinda stuff), these motors are designed to work with "self-contained" drivers. These drivers are pretty smart as they calculate the commutation sequences (and advance them to accel/decel) according to programmed specs. They read the position off of the encoder and either attempt to move forward/rev to stay on position.

Each driver/motor must be programmed and tuned to match. This matchin/tuning process includes setting voltage to motor.

The AB/Parker/Lenze drives almost all are willing to accept 115/230Vac line voltage and then does the magic for the voltage for the motor.

More programming than stepper drives, and way more flexible. Try running steppers at full torque at 2000 rpm or 1 rpm (same torque usually).

Stan

[Splint]

Stan,
it's probably me that's way off, I just assumed they had an external power supply like Rutex, my inexperience is showing trough here.

Splint

[salewis]

The ones I'm looking at just take step/direction signals (each with two wire - differential) and power (just about anything ac or dc from 80-230 volts).

The differential inputs are designed to significantly reduce/remove noise over much longer distances than standard parallel port/breakout boards (several hundred feet). That way controls for industrial machines could be centralized.

+Stan

[unterhaus]

If a drive will do the commutation correctly, the lower voltage will simply result in lower max speed, that's one thing that is similar between a brushless servo and a brushed servo. Unfortunately, there are a lot of different ways to do the commutation on brushless motors, and it certainly is possible that some drives will not properly do the job.