ABB SACE Tmax XT2 - 21 - Motor Protections

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 66
21 - Motor Protections
List
The Motor Protection package, available by default and only for Ekip M-Touch, includes the
protections:
Name
Type of protection
Page
R JAM
rotor blockage (after startup)
67
R STALL
rotor blockage (always active)
67
UC
Undercurrent
68
U
Phase loss
68
PTC
over temperature
69
Motor Protections comply with the IEC 60947-4-1 standard and related annex 2.
Trip class and
parameters
The trip class cited in the IEC 60947-4-1 standard is available in the Trip unit with Motor Class
parameter (page 115), and its value determines:
 The trip time L (Time t1)
 The start-up time (Motor start-up, calculated from when at least one phase exceeds the
fixed threshold of 0.25 x I1, during which some protections are inhibited
 The reset time from thermal memory L following a TRIP (tmem res)
Motor Class
t1 (s)
Motor start-up (s)
tmem res (min)
5E
12
3
5
10E
22
5
10
20E
45
10
20
Figure 24
NOTE 1: temporary shutdown during Motor Start-up is valid and active for the G, R
Jam and U protections, if enabled. If the protections are disabled, they remain off
before and after Motor start-up
Thresholds
The thresholds of R Stall, R Jam and UC, unlike other current protections, do not refer to In but
rather to threshold I1 (L protection), called Ir in the respective configuration menus.
Example:
Rated size = 40 A, Threshold I1 = 0.8 In ( 32 A); Threshold Ij = 2.5 Ir ( 2.5 x 32 A = 80 A)