If concentricity problems or error messages (e.g. overcurrent OC1) occur at a drive with speed feedback, the feedback system is often suspected of being responsible. Are the speed and direction of rotation determined correct? How can the evaluation of the encoder feedback connected be checked without auxiliary tools?
Answer:
In case of devices of the 9300 Vector series (including the Hoist technology variant) it is possible to operate the drive without feedback (C00025 = 1). In case of these devices the encoder feedback (TTL and HTL) can be connected to the digital frequency input X9. Thus, the speed transmitted by the feedback system can be indicated in the device without being used for the motor control.
How to proceed:
Select operation without feedback (C0025 = 1).
Disconnect the TTL encoder at X8 and connect it instead to X9. The HTL encoder remains connected to X9.
Check if the DFIN function block is entered in the processing table. In the Lenze setting, DFIN is entered on position 1 of the processing table (C0465/1 = 200).
Set the DFIN constant (C0425) to the number of increments of the encoder.
Turn the motor shaft: Either manually or by selecting a setpoint via the drive controller.
In code C0426 the speed detected by the encoder is indicated.
If GDC is used the diagnostics mode of the function block editor can be applied. The speed determined by the encoder is indicated in DFIN-OUT. Regarding this, it is required that the DFIN-OUT signal is linked with the input of any non-assigned function block (e.g. CONV3).
