MIke,
First the basics, Is the power connection made and working?,?If you are using
the remote control system then check if the power is "ON" at the tower control
box.? The remote control package (at the tower) has a master relay that must be
closed to supply power to the time delay and control relays.???
If there is power at the control box, then check the limit "down" switch for
proper action.? I have seen this type of switch hang up due to need of
lubrication.
Check the continuity through the down limit switch with the power OFF, find the
3 wire cable and check the NO and NC contacts are being made.
If that is okay, then check the time delay relay function.? With the power ON,
and the control switch position for DWN wait the 5 sec for the switch to
activate.??
Since the UP function works, a quick check would be to switch the two time
delay relays and then try the DOWN switch - if it works after the 5 sec delay
you have located the problem.?
Check the schematic for the key points to check continuity or measure
voltages.? There is not much to go wrong and the UP circuits and
the?DWN?circuits?are virtually identical, and operate essentially the same, and
the components are easily indentified so comparative measurements can be made.
Hope this helps and you find the problem.
Regards,
Norm?W4QN?
========================================================================
Message: 9
Date: Sun, 15 Jun 2008 17:58:41 -0700
From: "mvtaylor" <mvtaylor@qwest.net>
Subject: [TowerTalk] Need help with US Tower
I live in western Washington state and need to find someone who can help me
with
the control electronics for a TX-489MDPL and it is now in the erected position
and will not come down. Went up with the controller just fine. I eally would
appreciate the help.
Mike Taylor
AL1N
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