MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
82
Status messages
UNIT READY
Control card and power section are powered up and
OK.
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.
ENAB STOP
Unit ready and Q stop signal active.
START
Enabled and start signal applied, no or too low
reference signal.
RUN OK
Unit is running on reference.
JOGGING
RAMPING
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.
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
Display messages
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