Over temperature feedback resistor.... alarm

[scotch99]

Hello.
Has anybody some idea what can mean alarm 266 :"Over temperature feedback resistor PM1 or fan" on VKRC1 controller? Any solution for this problem?

[SkyeFire]

Check all the fans in the cabinet (for this error, the most likely culprit is the big 480VAC fan in the top of the cabinet, but check them all just in case).  Also, check the *direction* of the top fan -- on some controllers, it was possible to make the fan run backwards by getting the 480VAC phased incorrectly.  Just swapping two 480V supply wires should fix this.

If it's not a fan, then the problem may be in the PM1 power module.

[optimus_prime]

Hi,

Also check the fuses within KRC & you can also measure the Winding resistance of the fans.
Also the turning direction of the fan should be correct like Skyfire said.
Wrong turning direction of 3 phase supply blows up the fan. You can get special meters for checking the electromagnetic field turning direction.

[DNCA]

The solution is to place the robot at a lower speed m 100% until the robot controller to work at normal temperature, this error usually occurs because the robot works inenterrumpidamente for various periods of time without rest with what error generates these tables, once a cooling note you can gradually increase the speed

[gastonbuab]

When you say fans?

In my KRC1 there is only 1 fan. Is this ok?

[SkyeFire]

All KRC1s have multiple fans.  There's the internal cooling fan, the external cooling fan, and the cooling fan built into the PC rack.  And that's just what I can recall offhand.

[mookie]

disclaimer: ive been drinking

I used to see this years ago due to the ballast resistor. it ended up being a loose wire. I dare you to ask me which one when ive been drinking..

[the leg]

there are 2 fans
1 inside at the top and 1 at the rear behind the rear cover

the rear fan should run anticlockwise this is the correct direction

they will run backwards but are not as effective and may cause temp problems

the problem is if they have been running backwards for any lenght of time and you change them round they will not last very long

if this is the case then order 2 new fans before changing

on the fan plugs you will see 2 grey wires if you make a short between these it will prove if you have a fan problem as this is the feedback circuit