Film-Tech Forum ARCHIVE: ASR40 reverse scan into a TA-10

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Posted by John Westlund (Member # 913) on 09-26-2003, 05:14 PM:

Today we just installed our Component Engineering ASR40 reverse scan reader. I want to hook the power supply up to our TA-10 automation. here is the quote from the ASR40 manual:

"A new feature has been included in this power supply for the benefit of those who wish to switch LEDs Off when not needed (every minute Off adds a minute to its life). Shunting between them causes the LED to quickly fade-out, and opening the shunt will cause a quick fade-in. This means that there are no clicks or thumps heard if the audio circuit is live. This control circuit has very low voltage and current."

How do I set this up so that the the supply is turned on at Event 2 and turned off at Event 4. Is it as simple as running the wires from the power supply to the event relays and adding the jumper wires or is there something else that I have to do? I know some of you have experience out there with this. Thanks in advance.
John

Posted by Jim Alexander (Member # 226) on 09-26-2003, 06:42 PM:

Simply stated; Yes it is that simple. The Event Relay you use must be normally close (when you want the power supply off) and open when you want the LED to be on. I have no familiarity to the TA-10, but from this you should be able to get the idea.

Posted by Rick Long (Member # 213) on 09-26-2003, 09:48 PM:

A simple way might be to put a 110-volt relay across the motor terminals so that when the motor is on, the exciter comes on.

I seem to recall that this jumper must be REMOVED in order to bring the light on, so one would use the normally closed contacts of the relay.

Posted by Ken McFall (Member # 845) on 09-27-2003, 07:08 AM:

Hi John,

you should use the utility relay for the function you want. It has a normally open and closed pair. By default when new this relay is set to activate when the shutter is opened, just what you need.

Just wire to the common and the normally closed and your led's will be off until event two, shutter open and show on screen.

The utility relay functions are explained in the manual as it can be configured to work in a number of ways depending on your needs.

Posted by Gordon McLeod (Member # 33) on 09-27-2003, 07:22 PM:

Be aware that that the utility relay is a high current contact and may not stay clean on the low current of a control loop

Posted by German Marin (Member # 918) on 09-28-2003, 11:35 AM:

Don't forget to place a parallel switch to turn the LEDs on when you want to run it by manual. Is that reverse scan feed from a LS-30?

Posted by Ken McFall (Member # 845) on 09-28-2003, 12:58 PM:

German,
there is no need to insert a switch as the system works in reverse.... Closed contacts = Led's off, Open contacts = Led's on!

Goedon,
you are right that the contacts 'may' become dirty with time, but they will always 'fail' safe, ie with the Led's on so it's not really a problem in this case.

Posted by German Marin (Member # 918) on 09-29-2003, 11:59 AM:

I've set the system so I press start the LEDs turns on and turn off when it stop. If I want to run 69T I just run the motor and turn the LEDs on using the switch, [Confused]

I don't know other way to turn it on but in case of exist another way, please tell me 'cause I'm wasting [Mad]

switches and time.
Thanks.

Posted by Ken McFall (Member # 845) on 09-29-2003, 12:33 PM:

German,

John seems to have a newer power supply uint than you which works the opposite way to normal. In his case when you turn a switch on, close the contacts, the power supply turns OFF the led's. In your case, if I'm reading it correctly you turn a switch ON and the Led's turn on. Your solution of an extra external switch ia fine.

If John wanted to be able to turn his Led's on at will he could insert a switch in series with the automation wiring to break the circuit and the led's would then turn on. Same idea as you but it works differently.