Oscilloscope in the GDC: Is a signal overrun possible?

Question:

Can signals, which are shown in the GDC internal oscilloscope, lead to an overrun?

Answer:

All analog signals are shown from -199.99 % to +199.99 % in dependence to an assigned reference value each. E. g. the current is shown in [%] of the maximum current in C0022 and the speed in [%] of the maximum speed in C0011.

If an analog signal exceeds a reference value by the factor two, this will lead to a signal overrun. There are only a few signals, where this behaviour can occur.

Examples:

• Speed MCTRL-NACT in generator operation
• Current MCTRL-IACT in clamp operation (9300 vector + hoist)
• Current MCTRL-IACT during the magnetization (9300 hoist)

The GDC internal oscilloscope shows the values of the connected analog signals without further transformations, this means the signal overrun becomes visible. This overrun, however, has no influence on the internal motor control of the drive controller.

The figure shows a signal overrun of the digital signal MCTRL-NACT in generator operation (C0011= 500 rpm).