ABB SACE Tmax XT2 User Manual page 80

Motor
Protection
Protections
[ANSI code]
R JAM [51LR]
R STALL [51LR]
UC [37]
U
Protection notes
Performance guaranteed under all operating conditions
Protection
L
S
I / 2I
G
UF / UF2 / OF / OF2
Others
1SDH002031A1002 ECN000092998
Trip time t
t
t = tj
(7)
t
t = ts
t
t = tuc
t
t = tu
(8)
t
NOTES:
(1) for the calculation of t
(example: If = 0.8 In, I1= 0.6 In)
(2) with t4 = instantaneous, the maximum tolerance is 50 ms
(3) Tolerances valid with the Trip unit in steady state or switched on with auxiliary power

supply, trip time
are not guaranteed, the tolerances in the table following the notes are valid
(4) The trip unit considers a hysteresis of 3% for exiting the alarm condition
(5) Tolerance valid for frequencies in the range: fn ± 2%. For frequencies outside the range
there is a tolerance of ± 5%
(6) ± 20% for the 0.4 Hz/s threshold
(7) Time to be considered valid after the Motor start-up
(8) Time to be considered valid with protection in an alarm state after the Motor start-up. If
the alarm appears during the Motor start-up, the trip unit calculates and uses the lowest
value between tu and half of Motor start-up
Trip threshold tolerance
Activation in the range: (1.05-1.2) x I1
± 10 %
± 15 %
± 10 %
± 2 %
--
Rev. B
Trip threshold
Trip time tolerance
(3)
tolerance
± 7 % with If  6 In; ± 10 % with If > 6 In
± 10 %
± 10 % ± 10 %
± 15 % ± 20 %
± 15 % ± 20 %
use the values of the trip and threshold currents expressed in In
t
100 ms, temperature and signals within operating limits. If conditions
Trip time tolerance
± 20 %
± 20 %
 60 ms
± 20 % (60 ms with t4 = instant)
± 20 %
± 20 %
SACE Tmax XT2 – XT4 | 80