Timpdon Electronics
Tel 0161 - 980 7804
Issue 2 – October 2010
Web
www.timpdon.co.uk
EMail [email protected]
Cautionary Notes
1
The current consumption of a servo, when in motion, increases with the
rotation speed and load. At high rotation rates, the current on a single
standard servo can reach as much as 500 mA.
Most small batteries [eg AA cells] used by many modellers to power servos
can not supply this level of current without a very significant voltage drop,
in the order of one or two volts, at the battery terminals . With 4.8V
supplies, or with partially discharged batteries, this may well result in erratic
servo operation if the battery terminal voltage falls below the minimum
specified servo operating voltage.
If you experience such erratic operation, either reduce the servo rotation
speed or improve your power supply arrangements before assuming that the
SCS2
is faulty and returning it for repair.
2
Although the rotation rate of the
SCS2
can be programmed to a maximum
speed of 0.25 seconds for 90 degree rotation, many servos can not achieve
this speed
If you program a rotation speed higher than the servo can actually achieve
the servo will not be able to keep up with the programmed output of the
SCS2
when moving between
Set
and
Reset
, and vice versa.
If this occurs, and you have bounce levels programmed, the actual bounce
levels achieved in normal operation may vary considerably from those
programmed, or even be lost completely. This problem is likely to be more
apparent if you have programmed a large angle of rotation between
Set
and
Reset
.
If this happens, reduce the programmed rotation speed until the effect is
corrected, or change the servo for one with a higher maximum rotation
speed.
For the
ACOMS AS17
servo, supplied by
Timpdon Electronics
, the
maximum specified rotation rate is approximately 0.35 s for 90 degree
rotation at 5V.
