VLT ® 2000 Series Display messages I Status messages UNIT READY Control card and power section are powered up and OK. RUN OK Unit is running on reference. JOGGING RAMPING When the VLT frequency converter’s output frequency is reduced more quickly than the motor speed (due to inertia) can be changed, the motor will act as a generator. It will send energy back to the VLT and as a result the intermediate circuit voltate will increase. If the warning OVERVOLTAGE is displayed when the speed is reduced, you can increase the ramp-down time. If that is not posible, it may be necessary to activate the dynamic brake function with brake resistor.
If the warning occurs in other situations, the problem is due to the mains supply. ENAB STOP Unit ready and Q stop signal active. START Enabled and start signal applied, no or too low reference signal. I Alarm messages The following alarm messages are displayed after the power section of the VLT frequency converter has been disconnected. Messages Caused by Consequence Reset possible INVERTER Unknown error (not one of those Yes FAULT errors mentioned below) OVER a: Supply voltage too high a: Lower supply voltage Yes VOLT b: Ramp-down time too short b:
Increase ramp-down time or activate brake function to avoid overvoltage UNDER Supply voltage too low or Yes VOLTAGE loss of mains phase OVER Motor current too high or wrong Check motor parameters Yes CURRENT motor parameter setting Use a larger VLT GROUND Short circuit between VLT Check installation No, power off required, FAULT power section and ground and cable length then reset SHORT Short circuit between Check installation No, power off required, CIRCUIT two motor phases then reset OVER TEMP VLT temperature too high Check installation No, power off required, then reset OVER Load too heavy Yes, after VLT LOAD thermal protection is lower than 100% MOTOR Motor protection Yes, after VLT TRIP motor protection is zero 82 MG.20.B6.02 – VLT is a registered Danfoss trademark