Equinox Systems GEMINI Manuel d'utilisateur Page 93

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Gemini Users Manual 88
play than others. The RA worm gear can have somewhat more play than the
Dec., but it should not be more than necessary.
Make sure that the correct mount type is set. Gemini is designed to drive different
mounts at different speeds because of their different worm gear ratios.
Ensure that the motor cables are correctly seated.
Check the power supply and the power cable. A weak supply or a long power
cable with too small a conductor diameter will cause the voltage to drop under
load. The power supply and cable must deliver at least 3 amperes of continuous
current at 12 to 18 volts. A higher voltage within the range will produce more
torque. A regulated power supply whose negative pole is at ground voltage or a
battery is recommended.
Make sure that the telescope is balanced correctly. Making the RA axis slightly
heavier to the east ensures that the worm is in good contact with the worm gear as
it drives forward.
Reduce both the manual and the GoTo slewing speed for heavy loads.
7.1.5 UTC Date or Time Setting Wrong
If you are located west of Greenwich England at positive longitudes (such as the
American continent), your local time is behind UTC (or GMT). In America, you
must set Gemini's timezone setting to GMT-x (x is between 5 and 9 hours
depending on the timezone). To calculate the UTC time, you will have to add
these hours. If you do this in the evening, you probably will have to advance the
date, too. There is a web page http://www.DocGoerlich.de/utcdate.php that will
show you the current UTC in the correct format for Gemini.
East of Greenwich at negative longitudes (such as Australia), you have to subtract
the timezone value from the local time to get the UTC time.
If you use a planetarium program like TheSky, be sure to set the timezone
correctly before you set date and time. This is very important, since these
programs send the civil time to Gemini, and the timezone value is needed to
calculate the UTC time that Gemini needs.
Note: Some programs and computer clocks may define their timezones with signs
(+/-) opposite to those required by Gemini.
7.1.6 GoTo or Park Commands Are Rejected
Level 4 software allows you to set important parameters of your mount such as.
the gearing ratios. Changing these settings while operating the mount using the
hand controller or serial commands invalidates the internal position data. The
mount state is changed to “Unaligned”. It is recommended that you slew the
mount manually into the Startup Position and to proceed with a Cold Start for the
settings to take effect.
The mount is positioned outside the Safety Limits in RA. Manually slew back
within the limits.
You have set the safety limits or GoTo limit such that the telescope cannot reach
the requested GoTo target. Try resetting the safety limits or GoTo limit to their
default values.
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