Section 6. Failures and warnings
6.2.5. Automatic restarts
If the drive stops after failure there is a possibility of automatic operation restart after reason of system failure
disappears. The parameter 3.71 (amount of automatic restarts) restricts allowable quantity of automatic restarts in a
time period defined by parameter 3.72. Restart delay from the time of failure reason disappearance is defined by
parameter 3.73 (fig. 6.4).
The drive will not restart operation automatically if the internal counter of failure will achieve the value limited by
parameter 3.71 in time period determined by parameter 3.72. In this case operation restart will be possible only after
deleting failure message by one of methods mentioned in sections 6.2.1...6.2.3
The permission on automatic restarts is possible after setting value "YES" to parameters:
par. 3.74 (for failure Low Udc)
par. 3.75 (for failure High Udc)
par. 3.76 (for failure High current)
par. 3.77 (for failure High temperature of a heatsink)
par. 3.78 (for failure Failure of an analog input)
6.3. Codes of failures and warnings
Table 6.1 - List of failure and warnings codes
Failure
codes
F/W/M
1)
Displayed
name
Description
Possible reason
Counteraction
1
(F, W)
High
temperature
Fault: Heat sink temperature
too high
Warning: 5
О
C before
failure a warning appears.
The air course through the
converter is complicated, too high
temperature of environment.
Check efficiency of ventilation
(efficiency of the ventilating fan and
pollution of a heat sink).
2
(F – par.
3.35)
Earthing
The sum of motor currents is
not equal to null.
Note: This failure is only for
selected devices.
Damaged motor windings
insulation or connecting wires.
Check isolation resistance of the
wires connecting the motor and the
converter and isolation resistance of
windings of the motor.
3
(F)
High Udc
High voltage in circuit DC
Too high voltage in the circuit,
intensive braking of the motor
Test the mains
Increase a time of braking Par 1.31 or
1.33
4
(F)
Low Udc
Low voltage in circuit DC
Low voltage in circuit, absence of
one phase of a supply voltage
Check connecting cables and a level
of a feeding voltage
5
(F)
Short circuit
Short circuit on output of the
converter or failure of power
module
Short circuit in the motor or in the
wires feeding the motor
Disconnect the motor and test
presence of a short circuit, if present
call service to repair drive, and if is
not present test isolation of wires and
windings of the motor
6
(F)
High current
The current of the motor is to
high
Too high intensity of acceleration, a
sudden change of motor loading
Increase acceleration time of the
motor
Frequency converter MFC710 type. TWERD Power Electronics
47
Counter
of failure
STOP
OPERAT
ION
time
0
1
2
3
4
5
Par. 3.72
Par. 3.72
Par. 3.72
Par. 3.73 Delay of automatic restart
time
Automatic restart
Fig. 6.4 - Automatic restarts
Opera-
tion
