ABB REM610 Product Manual page 20

Motor Protection
REM610
Product version: C
Table 20. Three-phase definite time overcurrent protection (I
1)
Feature
Set start value, I >
s
At definite-time characteristic
Start time, typical
Time/current characteristic
• Definite-time operate time, t
Resetting time, typical/maximum
Retardation time
Drop-off/start ratio, typical
Operate time accuracy at definite time
characteristic
Operation accuracy
1) Stage I 2
x t and stage I > cannot be used at the same time.
s s s
Table 21. Motor startup supervision based on thermal stress calculation (I
1)
Feature
Set startup current motor, I
Start time, typical
• At start criterion I >I
L s
Set startup time for motor, t
Resetting time, typical/maximum
Drop-off/pick-up ratio, typical
• At start criterion I >I
L s
Operation accuracy
Shortest possible operate time
1) Stage I 2
x t and stage I > cannot be used at the same time.
s s s
20
Value
1.00...10.0 x I
55 ms
> 0.30...80.0 s
s
35/50 ms
30 ms
0.96
±2% of the set operate time or ±25 ms
±3% of the start value
Value
> 1.00...10.0 x I
s
100 ms
> 0.30...80.0s
s
180/250 ms
0.96
±10% of the calculated operate time ±0.2 s
300 ms
1MRS756304 C
Issued: 30.10.2009
>)
s
n
2
x t )
s s
n
ABB