Siemens SINAMICS G220 - Page 625

Requirement
The following e󹪜ects determine the converter temperature and can result in an overload
condition:
• The ambient temperature
• The ohmic losses increasing with the output current
• The increase of switching losses with pulse frequency
Description of function
The converter monitors the following values to be able to respond quickly to an impending
overload condition:
• Motor current
• DC link current
• Active power
• Chip temperature of the power electronics
• Heat sink temperature
For an impending overload condition, the converter attempts to reduce its load. The
converter responds di󹪜erently depending on the setting of parameter p0290.
Overload response when p0290=0
The converter signals an alarm for an impending overload condition.
The overload response depends on the control mode that has been set:
• For closed-loop speed control, the converter reduces the output current.
• For U/f control, the converter reduces the speed.
Once the impending overload condition has been removed, the converter re-enables the
output current or speed.
If the overload response does not prevent a converter overload, then the converter switches
o󹪜 the motor and issues a fault.
Overload response when p0290=1
The converter signals an alarm for an impending overload condition.
For an overload condition, the converter switches o󹪜 the motor and issues a fault.
Overload response when p0290=2
We recommend this setting for loads with a parabolic speed-torque characteristic, e.g. for
fans.
The converter signals an alarm for an impending overload condition.
Functions
14.11Drive functions
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 623