DeratingWater-cooled SINAMICS S120 chassis format units are rated for an ambient temperature of 45 °C and installation altitudes up to 2000 m above sea level. At ambient temperatures > 45 °C, the output current must be reduced. Ambient temperatures above 50 °C are not permissible. At installation altitudes > 2000 m above sea level, it must be taken into account that the air pressure, and therefore air density, decreases as the height increases. As a consequence, the cooling efficiency and the insulation capacity of the air also decrease. Note: Compared to the liquid-cooled chassis format units, the inlet temperatures are 7 K lower, as a heat exchanger is not required. Current derating as a function of the temperature of the cooling liquid 1) Current derating as a function of ambient temperature 1) 1) The factors of the two curves must not be multiplied. The highest value in each case must be assumed for the purposes of calculation, so that the derating factor in the worst-case scenario is 0.9. Permissible ambient temperature as a function of installation altitude Voltage derating as a function of installation altitude Current derating as a function of the pulse frequency To reduce motor noise or to increase output frequency, the pulse frequency can be increased relative to the factory setting (1.25 kHz or 2 kHz). When the pulse frequency is increased, the derating factor of the output current must be taken into account. This derating factor must be applied to the currents specified in the technical specifications. For additional information, please refer to the SINAMICS Low Voltage Engineering Manual. The following tables list the rated output currents of the SINAMICS S120 Motor Modules with pulse frequency set in the factory as well as the current derating factors (permissible output currents referred to the rated output current) for higher pulse frequencies. Derating factor of the output current as a function of the pulse frequency for units with a rated pulse frequency of 2 kHz
Derating factor of the output current as a function of the pulse frequency for units with a rated pulse frequency of 1.25 kHz
The following tables list the maximum achievable output frequency as a function of the pulse frequency: Maximum output frequencies achieved by increasing the pulse frequency in Vector mode
Maximum output frequencies achieved by increasing the pulse frequency in Servo mode
1) Higher frequencies on request. For further information see https://support.industry.siemens.com/cs/document/104020669 Pressure dropPressure drop for water-cooled chassis format units The pressure drop characteristic curves are valid for water. If antifreeze is used, the characteristic curves typically shift to the left. For further information, please refer to the SINAMICS Low Voltage Engineering Manual. Overload capabilityWater-cooled SINAMICS S120 units have an overload reserve, e.g. to handle breakaway torques. If larger surge loads occur, this must be taken into account in the configuration. For drives with overload requirements, the appropriate base-load current must, therefore, be used as a basis for the required load. The permissible overload levels are valid under the prerequisite that the drive units are operated with their base-load current before and after the overload condition based on a duty cycle duration of 300 s. Another precondition is that the Power Modules or the Motor Modules are operated at their factory-set pulse frequency at output frequencies > 10 Hz. For temporary, periodic duty cycles with high variations of load within the duty cycle, the relevant sections of the SINAMICS Low Voltage Engineering Manual must be observed. Power Modules and Motor Modules The base-load current for a low overload IL is the basis for a duty cycle of 110 % for 60 s or 150 % for 10 s. Low overload The base-load current IH for a high overload is based on a duty cycle of 150 % for 60 s or 160 % for 10 s. High overload The following applies to the 6SL3325-1TG41-3AA7 and 6SL3325-1TG41-6AA7 Motor Modules: Low overload for 6SL3325-1TG41-3AA7 and 6SL3325-1TG41-6AA7 Motor Modules High overload for 6SL3325-1TG41-3AA7 and 6SL3325-1TG41-6AA7 Motor Modules Line Modules The base-load current for a high overload IH DC is the basis for a duty cycle of 150 % for 60 s or Imax DC for 5 s. High overload |
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