Equipment selection
1. Inverter selection. When it comes to sizing, the first thing to consider is the operating conditions – whether one or more motors should be started or stopped at any time during the operation of the inverter.
If in the operation process of the inverter, the motor does not need to be started at any time, but it is not necessary to stop or stop, then when the inverter capacity is selected, it is only necessary to pay attention to the rated power of the inverter is greater than the total power of all motors, and then enlarge the one-level selection. In this case, when the electrical design is carried out, it is necessary to ensure a criterion: the inverter is in a suspended state before switching the contactor and putting into the operation of the inverter motor; During the operation of the inverter, it is forbidden to start and stop one or many pieces of equipment alone.
If the motor demand is started and stopped at any time during the operation of the inverter, then special attention should be paid to the inverter capacity selection! The first calculation may be to start and stop the total power of the motor at any time, and then multiply this power by 5-7 (in the process of inverter operation, the motor that starts at any time is equivalent to direct starting, and the motor starting current is almost 5-7 times the rated current), and finally add this result with the total power of the motor that does not need to start and stop at any time, and the sum obtained is the theoretical power of the required inverter. If there are many devices that need to start and stop, then this power can be used as the selection power of the inverter, and there is no need to amplify it by one level - because it is usually difficult to start multiple motors together. If there are few devices that require start and stop, then this power demand is amplified by one level to be used as the selection power of the inverter.
2. Selection of communication contactors
Regarding the motor that needs to start and stop at any time, it is necessary to equip it with a communication contactor. Regarding the selection of communication contactors, the general selection criteria can be followed - the rated current of the motor can be amplified by one level.
3. Thermal overload relay selection
In order to protect the safety of each motor and the equipment of the inverter, a thermal overload relay must be installed in the main circuit of the motor. Regarding the selection of thermal overload relays, it is sufficient to follow the general selection criteria - the rated current of the motor is within the setting range of thermal overload relays.
Precautions
In the case that one inverter drives N motors, if the line is too long, there may be a relatively large distributed capacitance, which will form a large high-frequency current and cause the inverter to overcurrent, leakage current addition, and low current display accuracy. If the line is too long, an output filter is required. The following is an example of a Fujifilm inverter.
The connection of motors below 3.7kW shall not exceed 50 meters, and the connection of motors above 3.7kW shall not exceed 100 meters. When driving multiple motors, it should be calculated according to the total wiring length of multiple motors.
If there is a thermal relay between the inverter and the motor, especially in the case of the 400V series, the thermal relay malfunction may occur even if the connection is less than 50 °. In this case, use an output filter to perhaps reduce the carrier frequency of the inverter.
When driving multiple motors, if an output filter is equipped, the total length of the motor connection should not be higher than 400 meters.
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