49
5. Motor overload protection
These inverters provide solid state motor overload protection.
Set parameter 9 using the following instructions,
(Pr. 9 "electronic thermal O/L relay").
<Setting>
• Set the rated current [A] of the motor.
(Normally set the rated current at 50Hz.)
• Setting "0" makes the electronic overcurrent protection (motor protective
function) invalid. (The inverter's protective function is valid).
• When using a Mitsubishi constant-torque motor, first set "1" in Pr. 71 to choose
the 100% continuous torque characteristic in the low-speed range. Then, set
the rated motor current in Pr. 9.
CAUTION
• When two or more motors are connected to the inverter, they cannot be
protected by the electronic overcurrent protection. Install an external thermal
relay to each motor.
• When the difference between the inverter and motor capacities is large and
the setting is small, the protective characteristics of the electronic overcurrent
protection will be deteriorated.
In this cause, use an external thermal relay.
• A special motor cannot be protected by the electronic overcurrent protection.
Use an external thermal relay.
To Next Page
Loading...
