[damunk]

Hi guys,

I have external brake on my servo motor. It has 3 pins. 24v+ , ground and pe for the housing. It required 24v DC.

And on the servo driver cn1 connection there is BRK+& BRK-

Right now the shaft on the motor does not turn as I do not have 24V DC connected to it.

1)Is my understanding right that if I connect 24v to the motor brake it will release the brake and the shaft can turn?
2_ My understanding right that brk+, brk - ,can control the on off , of the brake?
3) Can I leave brk+ and brk - alone for now and just have 24V dc connected all the time to the motor while i do testing procedures.

appreciate your help. so far all my questions get answered and i do appreciate.

[Jim Dawson]

1) Yes, 2) Yes, 3) Yes

[damunk]

You know Jim, i wish i asked this before because i ran without connecting 24v to the break and instantly the driver overloaded and stopped with alarm code overload. Thanksfully the alarm code is off and servo enable green light is on but I am anxious to see if I have caused damage.

I am waiting for my 24V DC power supply. I have tried to googledimage brk + & brk- because I want to know how you wire this. The manfacturer said that you have to put a relay in there. Is it basically just a on and off switch:

[Al_The_Man]

These brakes are continuous rated usually, what you need to do also is wire a BEMF diode across the coil, otherwise you will get a large spike that could cause problems.
The cathode to +DC side.
Also saves the relay contact also.
You should get away with a 1N4007.
Al.

[damunk]

These brakes are continuous rated usually, what you need to do also is wire a BEMF diode across the coil, otherwise you will get a large spike that could cause problems.
The cathode to +DC side.
Also saves the relay contact also.
You should get away with a 1N4007.
Al.

I will get a few of the 1N4007.Can you recommend the relay coil for the brk +, brk - please?

[Al_The_Man]

The Omron LY2-DC24 style are popular, but any that satisfy the coil voltage and brake current will normally work, also if the relay does not come with it, a diode across its coil is usually needed.
What is the resistance of the brake?
Al.

[damunk]

The Omron LY2-DC24 style are popular, but any that satisfy the coil voltage and brake current will normally work, also if the relay does not come with it, a diode across its coil is usually needed.
What is the resistance of the brake?
Al.

I will purchase these: RS are in uk and do next day delivery, thank you.

The brake resistance is: Still waiting to hear back from the seller.

Also please see picture attached from manual and my own picture.
In manual it says put fly diode on brake motor side but it shows relay contact on
driver side for pins 30 + 31

So it is treated seperatley? Never connect pin 30, 31 to the motor brake pins 1, 2, 3? Two separate circuits?

By the way, brake voltage and current is : 24V DC 0.64 amp.

http://maxcdn.cnczone.com/images/attach/jpg.gif
http://maxcdn.cnczone.com/images/attach/jpg.gif

[Al_The_Man]

Wired like this, both for Brake and the relay coil, wired close to each.
Al.

[damunk]

What about like this?



Says in manual: "order to improve breaking effect and response, a fly-wheel diode may be added at both ends of brake coil. Pay attention to positive and negative poles of diodes"

[Al_The_Man]

Not really, it does not suppress the BEMF, the diode has to go across the coil as shown in post #8.
Al.

[unterhaus]

I don't understand the in-line diodes at all.

[Al_The_Man]

I don't understand the in-line diodes at all.

I think the OP misunderstood this statement::

"Says in manual: "order to improve breaking effect and response, a fly-wheel diode may be added at both ends of brake coil. Pay attention to positive and negative poles of diodes"

They should have said Across the Coil instead of both ends as I see it.

Al.

[damunk]

@ unterhaus. don't be following any of my elec diagrams. and yes the manual did not say "across" It said added at both ends.

Please find another pic i got from a manual. I am confused. I can wire both diagrams but what is the line connecting them together?
I got a email response from the seller saying " You should provide Relay by yourself, the purchase is to solve the larger current of the brake coil , to switch the brake control to relay control."

From this I assume now that the relay has to handle 0.65amps. But there is no 0.65amps coming out of the servo driver. The 0.65amp is coming from the servo motor brake so am I right in thinking there is only one big circuit to build and not 2 separate ones?

[Al_The_Man]

The circled line is just shows the fact that the contact to switch the brake is part of the relay, IOW one unit and not a physical link..
Also there should be a diode across the brake coil.
You require 24vdc for the brake coil.
Al.

[damunk]

If only ONE circuit and 24v required for brake then why does it say 12v for bk+.?

I am powering servo drive connections with 12v dc.

i will draw a diagram how i am wiring the servo. please wait.

[damunk]

http://maxcdn.cnczone.com/images/attach/jpg.gif

[Al_The_Man]

I presume the 12+ marked brake, is for the brake relay.
The output is a small opto isolator and is not sufficient anyway to pick up a Brake, regardless of voltage.
The opto picks up a small relay which is then capable of picking up the brake, which in this case is 24vdc.
Al.