Danfoss FC 51 Series Programming Manual page 70

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Troubleshooting VLT Micro Drive FC 51 Programming Guide
ALARM 91, Parameter value is not valid in this mode
Occurs when trying to write an illegal value to a
parameter.
ALARM 92, Parameter value exceeds the min/max limits
Occurs when trying to set a value outside the range.
Parameter can only be changed when the motor is
stopped. Err. A wrong password was entered, occurs when
using a wrong password for changing a password-
protected parameter.
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68 MG02C602 - VLT is a registered Danfoss trademark