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11/17/2010 2:43 PM | |
Posts: 739 Rating: (55)
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MM440 STAR / DELTA It is needed to connect the motor in “STAR”. The software motor model does not differentiate between STAR and DELTA. If the motor is connected in DELTA (= the DELTA values are smaller as the STAR values), these equivalent data need to be converted before setting up motor parameters. P0350 stands for the line-line value of stator resistance plus cable resistance the value as measured with an ohm-meter between two phases can be written directly into P350 Parameterlist: P0350[3] Stator resistance (line-to-line) Stator resistance value in [Ohms] for connected motor (from line-to-line). The parameter value includes the cable resistance. P0350 = 2 x (R Cable + RS ) There are three ways to determine the value for this parameter: 1. Calculate using - P0340 = 1 (data entered from rating plate) or - P0010 = 1, P3900 = 1,2 or 3 (end of quick commissioning). 2. Measure using P1910 = 1 (motor data identification - value for stator resistance is overwritten). 3. Measure manually using an Ohmmeter. Note: - Since measured line-to-line, this value may appear to be higher (up to 2 times higher) than expected. - The value entered in P0350 (stator resistance) is the one obtained by the method last used. - Default value is depending on inverter type and its rating data. P0352[3] Cable resistance Describes cable resistance between inverter and motor for one phase (see Parameterlist). P352 = calculated or measured per-phase value for the cable resistance. This value is the same for a star or delta connected motor, since the delta connection of the motor does not influence the cable resistance. Please note that the “cold” (e.g. R1k) values need to be used. FAQ:http://support.automation.siemens.com/WW/view/en/37690358 Apps-Note:http://support.automation.siemens.com/WW/view/en/22078991 |
11/19/2010 4:52 PM | |
Posts: 739 Rating: (55)
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Hello, When operated below rated motor speed (~ 10Hz), the cooling effect of fans fitted to the motor shaft is reduced, so that most motors require de-rating for continuous operation at low frequencies. For protection measures using a PTC For a good cooling effect, an external cooling fan (motor option) needs to be fitted. for further information please see: GSG: http://support.automation.siemens.com/WW/view/en/38645759 OPI: http://support.automation.siemens.com/WW/view/en/24291961 PLI: http://support.automation.siemens.com/WW/view/en/23708204 |
11/19/2010 5:39 PM | |
Posts: 76 Rating: (0) |
hello mr.jenss, the motor had an external cooling fan with single phase supply. i just gothroughyour guide. thanks and regards, SENTHIL S
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9/6/2016 8:10 AM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4767 Rating: (123) |
New question published by ATEB is split to a separate thread with the subject Motor reading resistance. Best regards |
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