MMP Series
Over Current
The device provides overcurrent protection either with inverse-time or with definite-time element.
Current protection
Inverse-time delay curve
Definite-time delay curve
2) Definite-time delay curve
The operating time is unaffected by the magnitude
of the overcurrent.
1) Inverse-time delay curve
The trip time decreases as the overcurrent increases
in an inversetime curve.
Stall/Locked Rotor
Stall activates when the motor is unable to rotate due to any externally mechanical obstruction, and Lock activates due to internal issue of the motor.
Phase Fail/Phase Unbalance
The motor is unable to start under phase loss. If it occurs while the motor is running it causes motor stopping by lack of torque, or significant rotor
heating by reverse current. The S-EMPR calculates the percent three-phase unbalance current. If it exceeds 70%, which is determined to be phase loss,
the device trips within 1.5 sec. If it is between 10 to 70% the device trips within3 sec. This function is disabled for a single-phase mode.
LSIS Co.,Ltd.
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