i950 (unit size 6; 22kW): Standstill of the unit fan can cause overtemperature of the unit (corrected from production date KW01/2022)
Corrected from:
Servo Inverter i950, Power Unit (PU) device module: from PU production date KW01/2022
Display production date in the device under: Parameter 0x2000:3 'Device Data'.
Timing:
The units will be available around the same time as the release of the i950 FW V01.07.04.
Response of the new version:
The voltage range of the 24V supply voltage at X5 can now be used as specified in the documentation (max.28.8V) by changing the unit hardware.
What happens?
The unit fan does not run or runs sporadically and the unit generates the warning "Device: Fan failure heatsink".
If the appliance does not respond to the warning, it may shut down due to overtemperature if it continues to operate, depending on the load on the appliance.
Cooling of the unit is significantly reduced when the unit fan is deactivated.
When does the behaviour occur?
External 24V supply (X5): the voltage fed in is greater than the voltage generated internally by the unit of approx. 26V.
Limit the externally supplied 24V supply to X5 to a voltage of max. 24.4 VDC or do not supply X5 externally.
The specified maximum voltage at X5 is calculated by taking into account the theoretically existing tolerances of the 24V supply generated internally by the unit itself. Typically, the described behaviour only occurs from an external voltage of 26.5 VDC.
On the application side, evaluate the warning "Device: Fan failure heatsink".
A reduced cooling capacity of the unit can be reliably detected by the warning "Device: Fan failure heatsink".
Note:
Contrary to the associated documentation, an external 24V supply at X5 is not absolutely necessary for the operation of the unit. The external 24V supply at X5 is only required if the function of the communication and the IOs is to be maintained while the mains supply is switched off.
