FUTABA T4PM Instruction Manual page 80

Servo function setup
1
Select the setting item by moving the (JOG) button. Set the value by (+) and (-) button.
SMOT (Smoother)
This function makes servo operation smooth.
Set it according to your taste. Normally set it
to "ACT". Set it to "INH" when you want es-
pecially quick operation. When the smoother
function is set to "ACT" and the servo is oper-
ated, the distance up to the target position is
changed in steps so movement is smooth.
DEAD (Dead band)
The dead band angle at stopping can be
specifi ed.
[Relationship between dead band set value and servo operation]
Small - Dead band angle is small and the servo is immediately operated by a small signal change.
Large - Dead band angle is large and the servo does not operate at small signal changes.
(Note) If the dead band angle is too small, the servo will operate continuously and the cur-
rent consumption will increase and the life of the servo will be shortened.
DAMP (Damper)
The characteristic when the servo is stopped can be set.
When smaller than the standard value, the characteristic becomes an overshoot characteris-
tic. If the value is larger than the standard value, the brake is applied before the stop position.
Especially, when a large load is applied, overshoot, etc. are suppressed by inertia and hunt-
ing may occur, depending on the conditions. If hunting (phenomena which cause the servo
to oscillate) occurs even though the Dead Band, Stretcher, Boost and other parameters are
suitable, adjust this parameter to a value larger than the initial value.
[Relationship between damper set value and servo operation]
Small - When you want to overshoot. Set so that hunting does not occur.
Large - When you want to operate so that braking is not applied. However, it will feel like the servo response has worsened.
(Note) If used in the hunting state, not only will the current consumption increase, but the life
of the servo will also be shortened.
STRE (Stretcher)
The servo hold characteristic can be set. The torque which attempts to return the servo to the
target position when the current servo position has deviated from the target position can be
adjusted.
This is used when stopping hunting, etc., but the holding characteristic changes as shown
below.
[Relationship between stretcher and servo operation]
Small - Servo holding force becomes weaker.
Large - Servo holding force becomes stronger.
(Note) When this parameter is large, the current consumption increases.
80
S.BUS Link Function "S.BUS SX"