KEB COMBIVERT F6 Instructions For Use Manual - Attention
3.2.7 Dc link / braking transistor function GTr7
Activation of the braking transistor function
In order to use the braking transistor (GTR7), the function must be activated
with parameter "is30 braking transistor function".
For more information => F6 Programming manual
Inverter size
21
22
23
24
DC link rated voltage @ U
N_ac
= 400V
U
N_dc
/ V
565
DC link rated voltage @ U
N_UL_ac
= 480V
U
N_UL_dc
/ V
680
DC link voltage working voltage range
U
IN_dc
/ V
390...780
DC switch-off level „ERROR under potential“
U
UP
/ V
240
DC switch-off level „ERROR overpotential“
U
OP
/ V
840
Rated current @ U
IN_dc
= 565 V
I
IN_dc
/ A
121
155
190
228
Rated current @ U
IN_dc
= 680 V
I
IN_UL_dc
/ A
104
129
157
198
Rated current @ U
Out_dc
= 565 V
I
Out_dc
/ A
121
155
190
228
Rated current @ U
Out_dc
= 680 V
I
Out_dc_UL
/ A
104
129
157
198
DC switch-off level braking resistor
1)
U
B
/ V
780
Max. braking current
I
B_max
/ A
168
Min. brake resistance value
R
B_min
/Ω
5
Protection function for braking transistor (GTR7)
Short-circuit monitoring
Table 20: DC link / braking transistor function of the 400 V units
1) The DC switching level for the braking transistor is adjustable. The default value is the value spec-
ified in the table.
ATTENTION
Destruction of the drive converter if the value falls below the mini-
mum brake resistance value
► The minimum brake resistance value must not fall below!
Net
Rectifier
DC link
Converter
GTR7
Motor
DC Out
Braking
resistor
DC in
I
in
I
N
I
Out_dc
I
B
I
in_dc
Figure 3:
Block diagram of the energy flow
ATTENTION
Destruction of the drive converter
► If the error "ERROR GTR7 always ON" occurs, the drive converter
must be disconnected from the mains within 5 minutes!
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UNIT DATA OF THe 400V UNITS