controlling a Pelco Pan and Tilt with the Stampe and SSRs
henry99
Posts: 67
I'm trying to control a Heavy Duty Pelco PT1250P/PP Pan and Tilt camera mount with the Basic Stamp.
It says it can handle 100#s so I figure it'd be great for some robotic applications and I got it off ebay cheap.
Anyway, I looked at the manual and am trying to figure out how to drive this thing.
The manual is here: http://www.hellascams.gr/grc/products/accessories_extreme_derwent/pdf/Pelco_PT1250P_Pan_Tilt_Head_Installation_Operation_Manual.pdf
On page 9, it details the pinout. My understanding is that if I apply 120VAC between pin 3 (LEFT) and pin 8 (GND), then the motor will move left. If apply 120VAC between pin 7 (Right) and pin 8 (GND) it will move right. Is this correct?
I'm not certain about the Preset in the middle. It looks like a voltage divider circuit hooked up to a POT that is connected to the Left/Right or Down/UP. I'm assuming that if I apply +5V between to pin 11 (+5V) and pin 10 (ground) then I should be able to deduce the positions of the pan and tilt by using an ADC on pins 2 (pan preset) and 9 (tilt preset). However, if I apply a lower voltage, say 3.3V, it should also work right? It seems like just two resistors there.
Also, I plan on using a solid state relay hooked up to the pin on the basic stamp. I've been looking around and found these Panasonic AQ-H relays were very inexpensive $1.61 each and said they are good up to .9A and 600V. However, unlike other relays I've looked at, the specs are not clear.
Here is the datasheet:
http://www.alliedelec.com/Images/Products/Datasheets/BM/AROMAT/AROMAT_INDUSTRIAL-CONTROL_7880171.PDF
Is the LED reverse voltage of 6V and LED forward current of 50mA the equate to needing a supply of 50mA @ 6V to trigger?
Other SSRs I've looked like this one: http://www.futurlec.com/Relays/SSR5Apr.shtml
It says 3-15V input, 5A 240V output so I know if I hook up 3V one way then it will switch.
However, the Panasonic part is not so clear.
Any help would be greatly appreciated. Thanks!
It says it can handle 100#s so I figure it'd be great for some robotic applications and I got it off ebay cheap.
Anyway, I looked at the manual and am trying to figure out how to drive this thing.
The manual is here: http://www.hellascams.gr/grc/products/accessories_extreme_derwent/pdf/Pelco_PT1250P_Pan_Tilt_Head_Installation_Operation_Manual.pdf
On page 9, it details the pinout. My understanding is that if I apply 120VAC between pin 3 (LEFT) and pin 8 (GND), then the motor will move left. If apply 120VAC between pin 7 (Right) and pin 8 (GND) it will move right. Is this correct?
I'm not certain about the Preset in the middle. It looks like a voltage divider circuit hooked up to a POT that is connected to the Left/Right or Down/UP. I'm assuming that if I apply +5V between to pin 11 (+5V) and pin 10 (ground) then I should be able to deduce the positions of the pan and tilt by using an ADC on pins 2 (pan preset) and 9 (tilt preset). However, if I apply a lower voltage, say 3.3V, it should also work right? It seems like just two resistors there.
Also, I plan on using a solid state relay hooked up to the pin on the basic stamp. I've been looking around and found these Panasonic AQ-H relays were very inexpensive $1.61 each and said they are good up to .9A and 600V. However, unlike other relays I've looked at, the specs are not clear.
Here is the datasheet:
http://www.alliedelec.com/Images/Products/Datasheets/BM/AROMAT/AROMAT_INDUSTRIAL-CONTROL_7880171.PDF
Is the LED reverse voltage of 6V and LED forward current of 50mA the equate to needing a supply of 50mA @ 6V to trigger?
Other SSRs I've looked like this one: http://www.futurlec.com/Relays/SSR5Apr.shtml
It says 3-15V input, 5A 240V output so I know if I hook up 3V one way then it will switch.
However, the Panasonic part is not so clear.
Any help would be greatly appreciated. Thanks!
Comments
"On page 9, it details the pinout. My understanding is that if I apply 120VAC between pin 3 (LEFT) and pin 1 (COM), then the motor will move left. If apply 120VAC between pin 7 (Right) and pin 1 (COM) it will move right. Is this correct?"
I opened it up and it looks like two very heavy duty motor with 2 nice gear boxes on a worm drive.
One thing you better be care full about is not to have two winding in any motor
power at the same time
·Here the PT1250 Serise wiring for the PP
Here is the link to that page
ftp://ftp.pelco.com/ProductManuals/Pelco_PT1250_Series_PT1250DC_Series_PT1253R_PT1250_EX-AMS_PT1260EX_Series_PT1280_Series_Heavy-Duty_Pan_Tilts_service_manual.pdf
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Sam
Post Edited (sam_sam_sam) : 7/31/2008 4:31:18 AM GMT
There are 4 sets of mechanical "limit" switches inside. When the motor turns too far, a little toggle rubs up against the end stop and the switch is triggered, physically breaking the circuit.
If I remove the limit switch, it could keep panning/tilting until I tell it to stop. This would be dangerous for the tilt as it would crash but the panning would just keep spinning harmlessly except possibly destroying the position POT.
As it rotates, it rotates a pot which goes into a voltage divider to tell its positions. Does these things usually swipe all the way around continuously or do they stop turning at some point?
I'm thinking I can modify it by removing the POTS and limit switches and putting in a hall effect gear tooth sensor or vane sensor to determine how far one has panned. I'd have to mark position 0 somehow say with another magnet or something.
So basically I can get some alligator clips and draw 120VAC power from the wall and watch it spin? Do I NEED a fuse or something else to do this without killing myself?
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Bad spellers of the world untie!
Can someone help me out with figuring out how to interface to the cheaper Panasonic AQ-H relays?
They are inexpensive $1.61 each and said they are good up to .9A and 600V. However, unlike other relays I've looked at, the specs are not clear.
Here is the datasheet:
http://www.alliedelec.com/Images/Products/Datasheets/BM/AROMAT/AROMAT_INDUSTRIAL-CONTROL_7880171.PDF
Is the LED reverse voltage of 6V and LED forward current of 50mA the equate to needing a supply of 50mA @ 6V to trigger?
Other SSRs I've looked like this one: http://www.futurlec.com/Relays/SSR5Apr.shtml
It says 3-15V input, 5A 240V output so I know if I hook up 3V one way then it will switch.
However, the Panasonic part is not so clear.
Any help would be greatly appreciated. Thanks!
about hooking the AQ-H·up
Here is the Data Sheet for the· part that you want to use
http://pdf1.alldatasheet.com/datasheet-pdf/view/145593/ETC/JGX-41F.html
One thing to check is your milliamp draw on the input before you hook it up
to your Basic Stamps
I did not see·in the Data Sheet where it talk what the milliamp draw for the input is
It says 3-15V input, 5A 240V output so I know if I hook up 3V one way then it will switch.
The part that they show is not the right thing for that part #
3-15V input
······················ ·It should be 15 to 30 V input
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Sam
Post Edited (sam_sam_sam) : 8/2/2008 1:03:54 PM GMT
It says 10ma input but I'm not sure how much voltage as it doesn't seem to specify. Will it be safe to drive off 5V or 3V Cmos logic? Thanks.
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It says 10ma input but I'm not sure how much voltage as it doesn't seem to specify. Will it be safe to drive off 5V or 3V Cmos logic? Thanks.
It tell you all you need know 10 millamps that all you need to know
I am not at home right now to give you link to OHMS Law Calculator but you can gooogle for one or if··you know·ohms law you can you find out what resistor you will need for 5volts @ what resistine = 10 millamp that all you need to use
But i can tell from doing this before it going to about 1 k ohm or there abouts for five volts but check it with a
volt meter to make sure that it less than 10 millamps any thing above 5 millamps should do
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Sam
Post Edited (sam_sam_sam) : 8/2/2008 8:56:36 PM GMT