How to check IGBT type FP35R12KT4 the variable speed drive Schneider inverter Altivar ATV900 Series

Описание: a solution to do if the display as a Variable Speed Drive Inverter displays the MOTOR SHORT CIRCUIT.


The IGBT is a power switching transistor which combines the advantages of MOSFETs and BJTs for use in power supply and motor control circuits.

The above is the three modes of IGBT failure. Electrical fault is the most common, because IGBT assumes the function of current and voltage conversion, and the frequency is very high. A too high IGBT main circuit, a too high driving voltage, or a too high external spike voltage may cause overvoltage damage. In addition, overload or short circuit of the power Inverter may cause overcurrent.

Environment:
All serial numbers for Altivar Process Drive

Cause:
Drive is displaying Warning or Error Codes:
AP1 - AI1 4-20 Loss Warning
AP2 - AI2 4-20 Loss Warning
AP3 - AI3 4-20 Loss Warning
AP4 - AI4 4-20 Loss Warning
AP5 - AI5 4-20 Loss Warning
LFF1 - AI1 4-20mA loss
LFF2 - AI2 4-20mA loss
LFF3 - AI3 4-20mA loss
LFF4 - AI4 4-20mA loss
LFF5 - AI5 4-20mA loss

Resolution:
The 4-20mA loss operates with 2 hysteresis: one threshold to activate the 4-20mA loss and the other threshold to allow the reset of this 4-20mA.
When the AI value goes under 2mA the drive detects the 4-20mA loss.
When the AI value goes over 3mA the drive allows the reset of 4-20mA loss
When the AI value drops down pretty close to 2mA the drive displays a 4-20mA Loss Warning

Possible Remedies:
Verify the connection on the analog inputs
Check mA signal for possible interference
This detected error can be cleared with the [Auto Fault Reset] Atr or manually with the [Fault Reset Assign] rSF parameter after the cause has disappeared

To Clear 4-20mA Loss if getting Warning Light
If getting a red warning light flashing on the keypad normally it is because it detects an AI2 or AI3 4-20mA Loss Warning. To clear the warning light try the following: