June 19, 2019, 03:29:42 AM
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 Fan E2 do not speed down

normal_post Author Topic:  Fan E2 do not speed down  (Read 247 times)

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June 05, 2019, 07:18:25 PM
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I have a Kuka KRC2 210 , year 2009 and fan E2 always run on high speed, never speed down on low level.
I replaced fan, KE2 contactor and is same.
I checked X110 and X114 connections, they are allright.
Where are temperature sensors , they could be the cause?
No error shown on monitor, robot works perfect, only E2 fan run at high speed even temperature is cold.


Today at 03:29:42 AM
Reply #1



June 07, 2019, 06:47:24 PM
Reply #1


June 07, 2019, 08:08:12 PM
Reply #2

panic mode

Global Moderator
first rule of any electrical work including troubleshooting is the check schematics. why not do just that?

External fan is called E2 and all related things will have E2 somewhere in the name:
it is controlled by a relay KE2
and monitored by temperature sensor FE2

All of this is connected to KPS600 interface X110 using wiring W128528, W128528E2, W110863E2

One look at the schematics should show that relay is powered from X110.4
Same terminal is also used to power temperature monitoring circuit which then loops back to input on X110.8.
Depending on continuity between X110.4 and X110.8, KPS600 may decide to turn the fan on or off.

Temperature sensor shows as NC contact so it would open when temperature increases.
And there is another contact from overload F3

Does this give you any ideas?
1) http://www.robot-forum.com/robotforum/kuka-robot-forum/read-first/
2) if you want reply about robot, post it in forum
3) read 1 and 2

June 07, 2019, 08:16:16 PM
Reply #3

panic mode

Global Moderator
on the left cabinet wall, above 27V power supply, all the way in the back is terminal strip X2. there should be terminals 24,25,26
if you can measure voltage across 24-25, F3 is open.
if you can measure voltage across 25-26, temperature switch circuit is open (either temperature sensor is defective or it is not connected).
if you unplug temperature sensor by temporarily unplugging XE2 and there is no voltage across 24-26, then check KPS600.

June 17, 2019, 10:33:26 AM
Reply #4


Hi Panic Mode

I have measured voltage across 24-25, no voltage 0V
                                               25-26, no voltage 0V
I have unplugged XE2  and 24-26 voltage is 26 V
                                        25-26 voltage is 26 V

June 17, 2019, 10:58:28 AM
Reply #5

panic mode

Global Moderator
Looks like temperature monitoring circuit is ok. KPS600 is the suspect

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