Functions
6-96 7SJ62 Manual
C53000-G1140-C121-1
Figure 6-44 Logic Diagram for Motor Starting Protection
6.8.2 Programming Settings
General Motor starting protection is only effective and accessible if address was set
to Enabled during configuration of protective function. If the motor starting protection
feature is not required, address should be set to Disabled. The function may
switched 21 or 2)) at address )&7.
Setting Values Example:
Motor with the following data:
The setting for Address 67$5783&855(17 is calculated as follows:
For reduced voltage, the start-up current is also reduced almost linearly. At 80% nom-
inal voltage, the start-up current in this example is reduced to
0.8 * I
.STARTUP = 2.5 A.
/2&.527257,0(
67$57837,0(
67$5783&855(17
Fault Cond.
&
T0
>BLK START-SUP
2))
21
„1“
)&7
START-SUP PU
START-SUP OFF
DQG7ULSSLQJ/RJLF
or
>Rotor locked
START-SUP BLK
Pickup Aφ
or
or
or
S Q
R
or
Aφ
START-SUP TRIP
Rotor locked
F# 6823
F# 6821
F# 6822
F# 6812
F# 6811
F# 6805
F# 6801
0HDVXUHPHQW
Nominal Voltage V
N
= 6600 V
Nominal Current I
G
= 126 A
Start-Up Current I
STARTUP
= 624 A
Long-Term Current Rating I
MAX
= 135 A
Start-Up Duration for I
STARTUP
T
STA MAX
= 8.5 sec
CT Ratio I
N CT prim
/ I
N CT sec
200 A / 1 A
I
STARTUP-sec
I
STARTUP
I
N CT prim
------------------------
I
N CT sec
⋅
624 A
200 A
---------------
I
A
⋅ 3.12 A===
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