FUTABA 12K Instruction Manual page 72

• Speed Control
Speeds can be matched by specifying the operating speed. The speed of multiple servos can be matched
without being affected by motor fluctuations. This is effective for load torques below the maximum torque.
However, note that the maximum speed will not be exceed what the servo is capable of even if the servos
operating voltage is increased.
• Dead band
The dead band angle at stopping can be specified.
[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 current
consumption will increase and the life of the servo will be shortened.
• Travel Adjust
The left and right travels centered about the neutral position can be set independently.
• Boost
The minimum current applied to the internal motor when starting the servo can be set. Since a small
travel does not start the motor, it essentially feels like the dead band was expanded. The motor can be
immediately started by adjusting the minimum current which can start the motor.
[Relationship between boost set value and servo operation]
Small Motor reacts to a minute current and operation becomes smooth.
Large Initial response improves and output torque increases. However, if the torque is too large,
operation will become rough.
• Boost ON/OFF
OFF : It is the boost ON at the time of low-speed operation.(In the case of usual)
ON : It is always the boost ON.(When quick operation is hope)
• Damper
The characteristic when the servo is stopped can be set.
When smaller than the standard value, the characteristic becomes an overshoot characteristic. 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 suppushed by inertia and hunting 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.
• 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.
<Functions of System Menu>
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