126
For models 3022 through 9022 and 3044 through 31544 consisting of a single unit, the displays are the same
as the master unit, which are indicated on the following list.
<Models 3022, 3044 and higher only>
No
Protection
message
What are
protected
Description of protection operation
29
Gate board
abnormality
It starts when the protection indicated in No.30 or later is activated and the
protection operation relay is activated.
*However, in case of
(Failed fan (master unit)),
(Failed fan
(slave unit 1)),
(Failed fan (slave unit 2)),
and (Failed fan
(slave unit 3)), the protection operation does not start.
30
Gate board
communication
abnormality
(master unit)
It starts when an abnormality occurs in a communication with the gate board in
the master unit.
31
Gate power
supply
abnormality
(master unit)
It starts when the power supply of the gate in the master unit has an abnormality.
32
IGBT (P side)
protection
operation
(master unit)
It starts when overcurrent is applied to the P side IGBT in the master unit.
33
IGBT (N side)
protection
operation
(master unit)
It starts when overcurrent is applied to the N side IGBT in the master unit.
34
Unit overheat
(P side)
(master unit)
It starts when the temperature of cooling heat sink of the P side IGBT in the
master unit becomes more than or equal to a specified value.
35
Unit overheat
(N side)
(master unit)
It starts when the temperature of cooling heat sink of the N side IGBT in the
master unit becomes more than or equal to a specified value.
36
Blown fuse
(master unit)
(This function is applied to models 7522, 7544 and higher, and the unit parallel
models)
It starts when the fuse of the main circuit direct-current part in the master unit is
blown.
37
FCL operation
It starts when current over 290 % of the rated current of VF66B (DC motor drive)
is applied for two or more seconds in all units.
38
Power supply
abnormality
With parallel models, it starts when the power supply of the parallel control board
has an abnormality.
39
Failed fan
(master unit)
(This function is applied to models 7522, 7544 and higher, and the unit parallel
models)
It starts when the cooling fan in the master unit has an abnormality. (The
operation is not stopped for protection.)
40
MC response
abnormality
(master unit)
(This function is applied to models 7522, 7544 and higher, and the unit parallel
models)
It starts when the MC in the master unit does not turn on.
41
Converter
overheat
(master unit)
It starts when cooling heat sink temperature of the converter in the master unit
becomes more than or equal to a specified value.
42
Gate board
communication
abnormality
(slave unit 1)
It starts when an abnormality occurs in a communication with the gate printed
board in the slave unit 1.
