F5 KEB inverter nop problem

I may miss the point here. If the question is how to clear the error, page 57, item 4.7 Error Messages, of the KEB instruction manual may be of use. https://www.manualslib.com/manual/1293218/Keb-Combivert-F5.html?page=55#manual

Here is information about the error code:

KEB Error "E. OP"
ERROR overpotential (voltage)
1 Voltage in the DC-link cicuit is too high.
Occurs if the DC-link circuit voltage exceeds the permisible value.
Causes:
- poor controller adjustment (overshooting)
- input voltage too high
- interference voltages at the input
- deceleration ramp to short
- braking resistor defective or too small

Given the very technical nature of the KEB, I lean toward referring to the manufacturer's support. There are quite a number of KEB YouTube videos and a number of supporting documentations available on the web. Perhaps the following will be of use if not an entire misdirection: https://www.kebamerica.com/elevator-support/

https://www.kebamerica.com/products/f5-inverter/

Here is how to use the keypad. If a decimal shows up after the value is changed, enter must be pressed to save the value.

Also insure that the inverter is not enabled or in nOP status.

This may be due to the inverter waiting for an ST signal via buss communications.

What is the part # of the unit in question?

The inverter is recognizing that terminal 16 is going active but still waiting for another command to enable the inverter.

Fcon = forward constant

The inverter is operating at the set speed in the forward direction.

Forward CONtinues

System is at the commanded speed in the forward direction.

Nop = No operations

Provide signal to enable input (ST).

Need to enable the inverter via the ST terminal

By default direction is selected via digital signals to the control terminal strip of most Combivert inverters.

Check your manual for forward and reverse terminal.

Does the display say appl? if so, use the up arrow and go to a value of 200, then pres the enter key. Display should change to cp_on.