User manual

Operating Instructions - SLIM-STAR FL digi servo
MULTIPLEX Modellsport GmbH & Co.KG • Neuer Weg 2 • D-75223 Niefern-Öschelbronn • www.multiplex-rc.de Page 2 / 3
Instructions: SLIM-STAR FL digi servo # 82 5752 (05-06-13/CHHO) • Errors and omissions excepted. •
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MULTIPLEX
2. Power supply
All digital servos consume more current under load than conventional
analogue servos due to their higher-rate signal frequency and corres-
pondingly increased holding power. This applies equally to MULTIPLEX
types, and must be borne in mind when considering the power supply
(especially if using a BEC power supply with an electronic speed
controller). The following rule of thumb is a useful starting point when
determining the size (capacity) of the receiver battery or batteries to be
used:
Number of servos x 0.2 ... 0.4 = battery capacity in Ah
0.2: for a small number of small to medium-sized servos
(e.g. SLIM-STAR FL digi, MICRO digi)
0.4: for a large number of medium-sized to large servos
(e.g. PROFI digi, ROYAL digi, POWER digi)
3. Offsetting the neutral position, fitting the servo output arm
Before you install the servo in the model and adjust the linkage, connect
the servo to the receiver and switch on the RC system. Check as follows:
- Set the servo centre to 0% at the transmitter
- Set the transmitter trims to centre
- Check that the transmitter and servo signal formats are the same
(Î 1.)
Provided that the stick is at neutral, the servo will now be at its
mechanical and electrical neutral point, and the output lever can be fitted.
Ensure that the angle between the output lever and the pushrod (servo
case) is as close as possible to 90°. If you offset the output lever by one
spline, the neutral position shifts by 15.65° (360°/ 23 splines).
Securing the output lever
Remove the clamping screw and fit the output lever by hand. Take care
not to stretch the lever too much when pushing it onto the output shaft, as
it could be damaged. Disconnect the servo from its power supply and
hold the output lever firmly, then tighten the clamping screw using the
correct size of cross-point screwdriver (PH00). Tightening the screw fixes
the output lever in its final position on the splined output shaft.
If required, spare output levers are available separately under Order No.
8 5053 (1 x short, 1 x long).
4. PROGRAMMING THE SERVO DIRECTION
The direction of rotation of MULTIPLEX “digi”-series digital servos is
easily reversed using the MULTIPLEX SERVO-MASTER servo test and
programming unit, # 8 2093. This may be necessary if:
x your transmitter does not feature a servo reverse facility, or
x you wish to connect two servos to a single channel using a Y-lead,
and the direction of rotation of one servo needs to be changed.
5. INSTALLATION
The servo is supplied complete with all components required for two
different methods of mounting (Î Fig. 1):
x Variant 1: Mounting frame (A)
for veneered foam wings (conventional sandwich construction)
(replacement part No.: # 8 5051 = 1 pair)
x Variant 2: Mounting clip (B)
for hollow-core wings of built-up or composite (e.g. all-GRP)
construction (replacement part No.: # 8 5052 = 1 pair)
Installing the servo using the mounting frame
1. First press the cable end of the servo into the mounting frame (A),
then fit the locking piece (C) with the lug facing the servo. Fit the two
cross-point screws supplied to secure the assembly.
2. Clip the pushrod fairing (D) in place. This is done by gently squeezing
the fairing at the retaining lug position, and pushing it onto the
mounting frame (A). Check that all four lugs snap into place
(Î Fig. 2).
Installing the servo in the mounting clip
1. Place the servo in the mounting clip (B).
2. Fit the locking piece (E) and secure it with the two cross-point screws
supplied.
Installing the mounting frame (A) in the wing
TIP:
It is also possible to install the output lever pointing down, if the situation
requires (e.g. flaps with top-mounted horns). In this case remove the
bottom cross-piece in the mounting frame (A) (Î Fig. 3). The output
lever can now only be fitted after the servo has been installed. You may
need to widen the servo opening to allow this.
1. Determine the servo position. Turn the mounting frame (A) over and
draw round it carefully to mark the opening for the servo (Î Fig. 4).
Ensure that the thickness of the wing is sufficient (e.g. with a pin),
and that there are no spars or other reinforcements in the area.
2. Use a 4 mm Ø twist drill to bore a hole in the wing skin at all four
corner points (Î Fig. 5).
3. Cut away the wing skin using a sharp balsa knife and a steel rule.
Trial-fit the mounting frame with the servo fitted, and adjust the
opening as required. If the covering is to be ironed down insidethe
well, leave a gap wide enough for the material (Î Fig. 6).
TIP:
To be on the safe side you may prefer to drill 3 mm Ø holes, and then
enlarge the radii using a round file.
4. It is essential to fix the SLIM-STAR FL digi to the wing really
securely, i.e. the mounting frame must be glued to a hard sub-surface
(wing skin opposite the servo opening). If the distance to the opposite
skin is too great, and cannot be filled with adhesive, fit a suitable
spacer made of wood such as obechi or hard balsa.
5. Before reaching for the glue, check that the mounting frame and
servo can be fitted in the opening without force, and that the servo
ends up flush with the wing surface. Roughen the joint surfaces of the
mounting frame using abrasive paper, then glue the mounting frame
(with servo fitted) in place using epoxy resin or similar. Take great
care not to glue the servo itself to the wing, otherwise it will be
impossible to remove the servo without damaging it. It is a good idea
to apply wax or similar release agent to the servo beforehand.
Installing the mounting clip (B) in the wing
1. It is essential to fix the mounting clip (B) to the sub-surface (top wing
skin) really securely (Î Fig. 7). If the distance to the opposite skin is
too great, fit a suitable spacer made of wood such as obechi or hard
balsa.
2. Before reaching for the glue, check that the SLIM-STAR FL digi can
be fitted in the mounting clip without problem through the prepared
servo well (Î Fig. 8). Roughen the joint surface of the mounting
frame using abrasive paper. We recommend epoxy resin thickened
with chopped cotton strands for gluing the mounting clip in place.
TIP:
In low-profile hollow wings and thin fins with small servo openings, it may
be difficult to fit the SLIM-STAR FL digi in the mounting clip from the side
without angling it severely. In this case you can remove the two triangular
webs using a balsa knife (Î Fig. 9). Don’t remove the webs on the base,
nor the locating step at the screw end.