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Servo motor installation considerations

Servo motor installation considerations

Servo motor installation considerations

(OP)
We are about to install a machine with more than 40 servomotors (don´t know the size/ratings of the motors, but they should be equivalent to about 1-2 HP each), and most of the servodrives will be installed in a main control cabinet located about 50 meters from motors. I´m somewhat concerned about problems we could have with all those motors, their cables, EMI/RFI, power quality, etc., because we have had very little experience with machines having that many servo axis, the most we´ve had is 10 in a single machine, and the motors were located pretty close to the drives in that case.

The only special servo-related preliminary installation guideline we´ve received from the manufacturer so far indicates that we should run two separate trays for motor cabling, one for resolver cables and the other for motor cables, separated at least 30 cms from each other.

Obviously grounds are very important, as well as ferrite "doughnuts" on motor power cables, but what other guidelines should we follow and ask thye manufacturer to follow?  Any web reference somewhere?  Thanks..

RE: Servo motor installation considerations

Cokeguy,
Some suggestions:
1. Motor / signal cable separation 10cm for every 10M of cabling.
2. Twist motor power leads and ground at a common point near amplifier.
3. DC power supplies could use an additional 1000uf of capacitance if PS is located more than about 3 ft. from the drive.

See the following link for various tips on servo / drives / wiring.
http://www.a-m-c.com/content/m101/m101main.html

Hope this helps,
Scott

In a hundred years, it isn't going to matter anyway.

RE: Servo motor installation considerations

No chance of using field packaged servo drives and mounting them immediately adjacent to their motors?  Then you just run out power and data.  EMI is kept to a minimum, there is no opportunity for the resolver signals to get coupled to the drive current. Future trouble-shooting avoids the "which wires go to which drive?" scenario.

At the price of copper these days it might be less expensive too.

Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com

RE: Servo motor installation considerations

(OP)
Unfortunately we can´t get the drives closer to the machine (very big cabinet, very high temperature near the machine, not much space, etc..)

RE: Servo motor installation considerations

Servo motors often run hot - too hot to touch - so if it is a high ambient temperature environment, check you can reject enough heat to ambient without exceeding the motor thermal rating.

----------------------------------
  Sometimes I only open my mouth to swap feet...

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