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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