111
Display
Protection item
Description
as AC reactor constant. ("--" in the last two digits shows a number
to specify the location of setting error (in decimal notation).)
CPU abnormality
handling
CPU has an abnormal operation due to instantaneous reduction of
control power supply 5 V or other reasons. ("-" in the last digit
shows a number to distinguish errors.)
Fan failure
The cooling fan fails. The operation is not stopped for protection.
External failure 1
The multifunction input external failure 1 has been input.
External failure 2
The multifunction input external failure 2 has been input.
External failure 3
The multifunction input external failure 3 has been input.
External failure 4
The multifunction input external failure 4 has been input.
Blown AC fuse
The fuse of the AC part is blown.
Mode error
There is no input to the MI3 terminal block of <VFC66R-Z> in
the PWM sine wave mode,
or when there is input to the MI3 terminal block of <VFC66R-Z>
in the 120-degree conduction mode.
For models 7522, 7544 and higher, and parallel models 15022, 18022, 40044 through 100044, the protection items
listed below are displayed in addition to the above list.
For models 7522 through 9022, and 7544 through 31544 consisting of a single unit, the protection items (related
to master units) listed in the next table are displayed.
Models 7522, 7544 and higher, and parallel models
Display
Protection item
Description
Gate board
abnormality
Protection related to the following gate board starts and the
protection operation relay is activated.
Gate board
communication
abnormality
(master unit)
An abnormality in a communication with
the gate board <GAC66> in the master unit.
Gate power supply
abnormality
(master unit)
Power supply of the gate in the master unit
has an abnormality.
IGBT (L1/R phase)
protection operation
(master unit)
Overcurrent is applied to the L1/R phase IGBT
in the master unit.
IGBT (L2/S phase)
protection operation
(master unit)
Overcurrent is applied to the L2/S phase IGBT
in the master unit.
IGBT (L3/T phase)
protection operation
(master unit)
Overcurrent is applied to the L3/T phase IGBT
in the master unit.
Unit overheat
(L1/R phase)
(master unit)
Heat sink temperature of the L1/R phase IGBT
in the master unit becomes more than or equal to a specified value.
Unit overheat
(L2/S phase)
(master unit)
Heat sink temperature of the L2/S phase IGBT
in the master unit becomes more than or equal to a specified value.