Problem with mount slewing

[ZiHao]

Okay so after sorting out the power supply problem, a new issue comes in... Two axis of the mount can't slew at the same time. Like when siderate rate tracking is on, I can't slew on the declination axis. When I am slewing on RA axis, I cannot immediately slew in declination axis. It shows over slew limit on the hand controller screen. After slewing on one direction, I have to wait until the gears all completely settle down to slew in another axis. Any ideas, thanks.. 

[Cornelius Varley]

6 minutes ago, ZiHao said:

Okay so after sorting out the power supply problem, a new issue comes in... Two axis of the mount can't slew at the same time. Like when siderate rate tracking is on, I can't slew on the declination axis. When I am slewing on RA axis, I cannot immediately slew in declination axis. It shows over slew limit on the hand controller screen. After slewing on one direction, I have to wait until the gears all completely settle down to slew in another axis. Any ideas, thanks.. 

I don't think it is a problem, its just how they do it. 

[ZiHao]

Previously I can slew on Dec axis when tracking is on, now I can't, guiding probably wouldn't work also. This only happens after using with a new switching power supply today. 

[Carbon Brush]

 

Sounds to me like the power supply can't cope.

if you have told us what the supply is, sorry but I can't find it.

David.

[ZiHao]

@Carbon BrushThe original one ( the first picture ) which is the broken one.

The second picture, is the one I am using right now. It is heavier and gets hot in a short time, when it is plugged in, the hand controller responds or turned off pretty quickly compared to the original switching power supply provided with telescope.

[Carbon Brush]

Go out and buy a decent 12V supply.

The 'replacement' you describe as heavier. This means it is in all probability a transformer based supply.
Often these do not even have a regulated output.

You have not included the ratings label in your photo.

Go to an astronomoy equipment retailer and tell them you want a 12V supply for your mount.

Do not buy from someone who does not know what they are selling.

[Cornelius Varley]

The second one is probably unregulated and cannot supply sufficient amps/volts when slewing. What happens with an unregulated psu is that when the amps drawn increases the volts drop thereby causing the mount to stop working. Also, if it is a regulated type, if the amps load goes beyond what the psu can deliver the psu will then shut down.

[Skipper Billy]

I guess that it just cant supply enough amps to drive both motors at the same time.

I also guess that there arent too many specialist astronomy shops in Puchong, Western Malaysia !!

As long as you are not running anything else from the power supply like dew strips etc then something like this would do the job.

https://www.amazon.co.uk/JnDeeTM-ADAPTER-Transformer-Monitors-Powering/dp/B071VW5R3P?ref_=fsclp_pl_dp_2

The key is it must be 12 - 13.7 volts and critically about 10amps supply. 

Your other alternative is to use a car battery - nice clean power - plenty of amps but needs charging up fairly regularly.

[michael8554]

Hi ZiHao

As Skipper recommends, but I don't know what the your parts supply situation is in West Malaysia, so I would recommend you search the mount's specification for the voltage and current requirements.

Then buy a Regulated Power Supply that provides about 2 amps more, supplies 12 -13.8 volts, and has the correct size plug for the mount.

Michael

[ZiHao]

Bought a new switching power supply for just 7 dollars from a electronics store nearby and everything works fine. @Carbon Brush, @Cornelius Varley, @Skipper Billy, @michael8554 thanks for your help!