Mitsubishi Electric MELDAS MDS-R Series Specifications And Instruction Manual page 206

(2) Unbalance torque compensation
If the load torque differs in the positive and negative directions such as with a vertical axis or slant
axis, the torque offset (SV032 (TOF)) is set to carry out accurate lost motion compensation.
<Setting method>
Measure the unbalance torque. Carry out reciprocation operation (approx. F1000) with the axis to
be compensated and measure the load current % when fed at a constant speed on the NC servo
monitor screen. The unbalance torque at this time is expressed with the following expression.
The unbalance torque value above is set for the torque offset (TOF).
If there is a difference in the protrusion amount according to the direction, make an adjustment with
LMC2. Do not adjust with TOF.
No. Abbrev. Parameter name
SV032 TOF
Downloaded from ManualsNet.com
Unbalance torque (%) =
(Example)
Assume that the load current % was -40% in the + direction and -20% in the - direction
when JOG feed was carried out at approx. F1000. The unbalance torque is as shown
below, so -30% is set for TOF.
-40 + (-20)
2
Torque offset Set this to carry out lost motion compensation.
Set the unbalance torque for the vertical axis and slant axis.
Even when TOF is set, the torque output characteristics of the motor and load
current display of the NC servo monitor will not change. Only the characteristics
POINT
of the LMC compensation function are affected.
search engine
9. Adjustment
(+ feed load current %) + (- feed load current %)
2
= -30%
Explanation
9 - 21
Setting range
-100 to 100
(Stall current %)