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6.3 Locked-rotor protection
In the process of starting, if the motor shaft is stuck due to excessive load or mechanical reasons,
and the fault is not removed in time, the motor will overheat and the insulation will be reduced
and the motor will be burned out.The locked-rotor protection is applicable to the motor when such
faults occur in the starting stage. When the average current percentage reaches the set threshold,
the protector will trip or alarm within the set time in time to avoid the motor burning out.
Note
:
Iav
:
Three-phase mean current
Is1
:
Alarm action threshold
Is2
:
Tripping threshold
Ts1
:
Alarm action delay time
Ts2
:
Delay time of trip action
6.4 Blocking protection
During the operation of the motor, if the motor shaft is stuck due to excessive load or mechanical
reasons, and the fault is not removed in time, the motor will be overheated and the insulation will
be reduced and the motor will be burned out.The blocking protection is applicable to protect the
motor when such faults occur in the running stage. When the average current reaches the set
threshold, the protector will trip or alarm within the set time in time to avoid the motor burning
out
。