Siemens 7SR51 - 37 Undercurrent Protection - Phase; Common Settings; Undercurrent Protection

37 Undercurrent Protection – Phase
Common Settings
Reference
Parameter Value
I
set
UC guard setting 0.05 to 5 ⋅ I
rated
, Δ 0.05
I Applied current (for operate time) 1.1 to 0.5 ⋅ I
set
(switched)
Operate and Reset Level
Attribute Value
I
op
Operate level I
set
: ± 5 % or ± 1 % I
rated
Reset level ≤ 105 % I
op
± 1 %
t
op
Operate time 0.5 ⋅ I
set
: 35 ms, ± 10 ms
Reset time
Undercurrent Protection
Reference
Parameter
Value
I
set
Setting 0.05 to 5 ⋅ I
rated
,Δ 0.05
I Applied current (for operate time) 1.1 to 0.5 ⋅ I
set
(switched)
t
delay
Delay setting 0 to 20 s, Δ 0.01 s
20 to 100 s, Δ 0.1 s
100 to 1000 s, Δ 1 s
1000 to 10000 s, Δ 10 s
1000 to 14400 s, Δ 100 s
Operate and Reset Level
Attribute
Value
I
op
Operate level I
set
: ± 5 % or ± 1 % I
rated
Reset level ≤ 105 % I
op
or I
op
± 1 % I
rated
Repeatability ± 1 %
Variation IEC
60255-1
-10 °C to +55 °C ≤ 5 %
f
rated
± 5 % ≤ 5 %
Operate and Reset Time
Attribute
Value
t
basic
Element basic operate time 0.5 ⋅ I
set
: 50 ms ± 10 ms
t
op
Operate time following delay t
basic
+ t
delay
± 1 % or ± 10 ms
Repeatability ± 1 % or ± 10 ms
Overshoot time < 40 ms
Disengaging time < 60 ms
10.6
10.6.1
10.6.2
Technical Data
10.6 37 Undercurrent Protection – Phase
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 509
C53000-G7040-C014-1, Edition 11.2019