A05001 — Power unit: Overtemperature depletion layer chip

A05001 tells you that the alarm threshold for overtemperature of the power semiconductor in the AC converter has been reached — the depletion layer of the chip, called the barrier layer in some of the entries, has become too warm. The operator panel and the commissioning tool show the condition as Power unit: Overtemperature depletion layer chip. Depending on the drive configuration, the same condition can also be output with no reaction (N).

The alarm is the warning stage ahead of the fault: the response the drive performs in this state is the one set in p0290, and fault F30025 is initiated if the depletion layer temperature increases further. The entries for the S120/S150, G120 and G120XA name the margin as the value set in p0292[1]; the G130/G150 entries state it as an additional 15 K.

• The alarm threshold for the overtemperature of the power semiconductor in the AC converter has been reached at the depletion layer of the chip.

1. Check whether the ambient temperature is within the defined limit values.
2. Check whether the load conditions and the load duty cycle have been appropriately dimensioned.
3. Check whether the cooling has failed.
4. Check whether the pulse frequency is too high.

The entries also cover a special case: if the alarm occurs after reducing the current controller sampling time (p0115[0]) during the motor data identification (standstill measurement), it is recommended to initially perform the identification using the standard sampling time and only then change the sampling time over.

• p0290 (Power unit overload response): here you set how the drive responds once this alarm threshold has been reached.
• p0292 (Power unit temperature alarm threshold): index [1] holds the further temperature rise after which fault F30025 is initiated — the G130/G150 entries give this margin directly as 15 K.
• p0115 (Sampling time for supplementary functions): index [0] is the current controller sampling time; if the alarm appeared after it was reduced for the motor data identification, run the identification with the standard sampling time and change over afterwards.
• r0037 (Control Unit temperature): named in the entries under See also as a related parameter for this alarm.

This alarm needs no acknowledgement: nothing has to be reset at the operator panel. What the drive does while the condition is present is defined by p0290, and fault F30025 only follows if the temperature climbs beyond the margin described above. Work through the checks above to remove the cause of the high chip temperature.