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4 Servo Adjustment
MITSUBISHI CNC
4-7 Protective functions
4-7-1 Overload detection
The servo drive unit is equipped with an electronic thermal that protects the servomotor and servo drive unit
from overload conditions. The overload 1 alarm (alarm 50) is detected if an overload condition occurs, and
the overload 2 alarm (alarm 51) is detected if 95% or more of the maximum current is commanded
continuously for 1 second or longer due to a machine collision, etc. The parameters shown below are for
machine tool builder adjustment purposes only, and should be kept at their standard settings (SV021=60,
SV022=150).
【#2221】 SV021 OLT Overload detection time constant
Normally, set to "60". (For machine tool builder adjustment.)
---Setting range---
1 to 999 (s)
【#2222】 SV022 OLL Overload detection level
Set the "Overload 1" (Alarm 50) current detection level as percentage to the stall current.
Normally set this parameter to "150". (For machine tool builder adjustment.)
---Setting range---
110 to 500 (Stall current %)
For details concerning the overload protection characteristics, refer to the MDS-D-SVJ3/SPJ3 Series
Specifications Manual (IB-1500158).