ABB | SACE Tmax XT
Protections | 11 - Performance table81 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
Motor protections
Protection
[ANSI code]
Trip time t
t
Trip threshold
tolerance
(3)
Trip time tolerance
R JAM [51LR] t
t
= tj ± 10 % with If ≤ 6 In: ± 7 % / with If > 6 In: ± 10 %
R STALL [51LR] t
t
= ts ± 10 % ± 10 %
UC [37] t
t
= tuc ± 15 % ± 20 %
U t
t
= tu
(8)
± 15 % ± 20 %
Note on protections
(1)
use trip and threshold current values expressed in In for calculating t
t
(example: If = 0.8 In, I1= 0.6 In)
(2)
with t4 = instantaneous, the maximum tolerance is 50 ms
(3)
Tolerance values valid with Trip unit at steady state or on with auxiliary power supply, trip time ≥ 100 ms,
temperature and signals within operating limits; the tolerances in the table after the notes are applicable if the
conditions are not guaranteed
(4)
the trip unit considers a 3% hysteresis for clearing from the alarm condition
(5)
tolerance valid for frequencies within range: fn ± 2 %. A ± 5% tolerance is applicable for off range
frequencies
(6)
± 20% for threshold 0.4 Hz / s
(7)
time to be considered valid after Motor start-up
(8)
time to be considered valid with protection in alarm status after Motor start-up; if the alarm appears during
Motor start-up, the trip unit calculates and uses the lowest value between tu and the half of Motor start-up
Performance guaranteed in all operating conditions
Protection Trip threshold tolerance Trip time tolerance
L Activation within range: (1.05 to 1.2) x I1 ± 20 %
S ± 10 % ± 20 %
I / 2I ± 15 % ≤ 60 ms
G ± 15 % ± 20 % (60 ms with t4 = instantaneous)
UF / UF2 / OF /
OF2
± 2 % ± 20 %
Other -- ± 20 %
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