4
Charging Fault
Vacon · NX Liquid-Cooled Drive
What does 4 mean?
The pre-set charging time for the DC-link, defined by parameter P.2.1.3 (MaxChargeTime, default 5 seconds), has been exceeded. Specifically, the DC voltage failed to rise above 40VDC within 1 second during the initial charging sequence.
Source: Vacon NX Liquid-Cooled Drive
Open Manual (Page 201)