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Will a MICROMASTER 4 drive more than one motor
#1
Will a MICROMASTER 4 drive more than one motor?





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Operation with more than one motor is possible with all inverters, providing the following points are observed:





V/f operating mode (P1300 = 0) should be used. SVC (sensor less vector control) or encoder operation is not possible under any circumstances.




The sum of the motor currents should be less than the inverter output current.




The stator resistance should be set to that of the total motor resistance for all the motors in parallel (P0350).




The motor current (P0305) and power (P0307) should be set to the total value of all the motors.




The motor protection function provided in the frequency inverter cannot be used for multi-motor operation. We recommend that a specific overload protection is provided for each motor:


-

One PTC or KTY84 + one evaluation unit 1) + one contactor per motor


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Or connect PTCs in series + one evaluation unit 2) --> at a digital input of the frequency inverter = "External fault" (P0701…P0708 = 29).



An output choke can also be used to reduce heating in the protection devices, and therefore preventing overheating and premature tripping of the devices.




The total cable length should not exceed that recommended for the inverter.




It is not recommended to connect or disconnect any of the motors while the inverter is running as the inrush current may cause the inverter to trip.
When the motor is disconnected high voltages may be generated which may damage the inverter.






1)

The KTY84 can be used in conjunction with 3RS104 or 3RS204 evaluation units. The PTC may be used in conjunction with 3RN1 evaluation units.


2)

It is not permissible to connect several KTY84 devices in series (nor parallel) and use these together with a 3RS104 or 3RS204 unit; the reason for this is that this would result in completely incorrect measurement results.
For PTC evaluation units, the series circuit is (limited) possible, as long as the total resistance in the measuring circuit lies below the response value of the 3RN1 unit. Normally, this is a maximum of 6 sensors in series. Additional evaluation units are required for more than 6 sensors. The units are then switched-out using the auxiliary contacts.



Information:

A motor manufacturer generally uses a separate sensor for each motor winding. The sensors are then already connected internally in series. There is a special version 3RN1062 for multi-motor monitoring. This permits up to 6 sensor circuits – i.e. also 3 sensor elements in series. An additional advantage is due to the fact that not only can all motors be shut down, but using LEDs, the motor whose sensor responded can be identified (i.e. the motor that is too hot). This simplifies troubleshooting.




Written by:

SD CST
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