Fantech VLT 2800 Series Instruction Manual page 91

WARNING/ALARM 2: Live zero fault
The voltage or current signal on terminal 53 or
60 is below 50% of the preset value in parameter
309 or 315 Terminal, min. scaling.
WARNING/ALARM 4: AC line phase fault
Missing phase on AC line supply side.
Check the supply voltage to the adjustable frequency
drive. This fault is only active in 3-phase AC line.
WARNING 5: Voltage warning high
If the DC bus voltage (VDC) is higher than
Voltage warning high, the adjustable frequency
drive will give a warning and the motor will
continue to operate unchanged.
Check whether the supply voltage matches the rating
of the adjustable frequency drive. (See Technical data.)
If the VDC remains above the voltage warning limit, the
inverter will trip after a fixed period of time. The time
depends on the unit and is set at 5 - 10 sec.
NOTE: The adjustable frequency drive will trip with
an alarm 7 (overvoltage). A voltage warning can also
occur if the motor frequency is reduced too quickly
due to the ramp down time being too short.
WARNING 6: Voltage warning low
If the DC bus voltage (VDC) is lower than Voltage warn
low, the adjustable frequency drive will give a warning
and the motor will continue to operate unchanged.
Check whether the supply voltage matches the rating
of the adjustable frequency drive. (See Technical data.)
NOTE: The adjustable frequency drive will trip with
an alarm 5 (undervoltage). When the adjustable
frequency drive is switched off, a warning 6 (and
warning 8) is displayed briefly.
WARNING/ALARM 7: Overvoltage
If the DC bus voltage (VDC) is higher than the inverter's
Overvoltage limit, the inverter will switch off until the
VDC once more falls below the overvoltage limit. If the
VDC remains above the overvoltage limit, the inverter
will trip after a fixed period of time. The time depends
on the unit and is set at 5 - 10 sec. When the inverter
is switched off a trip reset is generated.
NOTE: Voltage warning high (warning 5) will thus also
be able to generate an alarm 7. An overvoltage in the
90
VLT® 2800 Series
DC bus can occur if the motor frequency is reduced
too quickly due to ramp-down time being too short.
WARNING/ALARM 8: Undervoltage
If the DC bus voltage is lower than the inverter's
Undervoltage limit, the inverter will switch off until the
VDC once more goes above the undervoltage limit.
Check whether the supply voltage fits the adjustable
frequency drive. (See Technical data.) If the VDC
remains under the undervoltage limit, the inverter will
trip after a fixed period of time. The time depends on
the unit and is set at 1 - 3 sec. When the adjustable
frequency drive is switched off an alarm 8 (and warning
6) is displayed briefly and a trip reset is generated.
NOTE: Voltage warning low (warning 6) will thus
also be able to generate an alarm 8.
WARNING/ALARM 9: Inverter overload
Electronic thermal inverter protection indicates that the
adjustable frequency drive is close to disconnecting due
to overloading (output current too high for too long). The
counter for electronic thermal inverter protection gives
a warning at 98% and trips at 100% giving an alarm.
The adjustable frequency drive cannot be reset
until the counter is below 90%. Remove the
overload condition to the drive.
WARNING/ALARM 10: Motor overloaded
According to the electronic thermal inverter protection
the motor is too hot. In parameter 128 the user can
select whether the VLT adjustable frequency drive
should emit a warning or an alarm when the counter
reaches 100%. This fault is due to the motor being
overloaded by more than 100% for too long.
Check that motor parameters 102-106 are set correctly.
WARNING/ALARM 11: Motor thermistor
The motor is too hot or the thermistor/thermistor
connection is cut off. Parameter 128 Motor thermal
protection allows a choice of whether the adjustable
frequency drive is to give a warning or an alarm.
Check that the PTC thermistor has been correctly
connected between terminal 18, 19, 27 or 29 (digital
input) and terminal 50 (+10 V supply).
MG.28.A8.22 - VLT is a registered Danfoss trademark