Motor Protections - ABB SACE Tmax XT5 Operation And Maintenance Manual

8 - Motor protections

Trip class and parameters The trip class mentioned in standard IEC 60947-4-1 is available in Trip units with Motor Class parameter
Thresholds Unlike the other current protections, the R Stall, R Jam and UC thresholds are not related to In, but to
68 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
Elenco The Motor Protection package, available by default and only for Ekip M Touch, comprises protections:
Name
R JAM
R STALL
UC
U
PTC
The Motor protections conform to standard IEC 60947-4-1 and relative annex 2.
(page 117).
Its value establishes:
• the trip time of L protection (Time t1)
• the start-up time (Motor start-up), calculated from the moment that at least one phase exceeds the fixed
threshold of 0.25 x I1, during which some protections are inhibited
• the thermal memory L reset time after a TRIP (tmem res)
Motor Class
5E
10E
20E
30E
Figure 32
NOTE: temporary switch-off during Motor Statup-up is valid and activated for protections G,
R Jam and U if enabled; if the protections are disabled they remain off before and after Motor
start-up
threshold I1 (L protection), given as Ir in the respective configuration menus;
Example
Rating plug = 400 A, Threshold I1 = 0.8 In (--> 320 A); Threshold Ij = 2.5 Ir (--> 2.5 x 320 A = 800 A)
Type of protection
Motor block (post startup)
Motor block (always activated)
Under-current
Phase loss
Maximum temperature
t1 (s)
12
22
45
72
Page
69
69
70
70
71
Motor start-up (s) tmem res (min)
3 5
5 10
10 20
20 33
Protections | 8 - Motor protections
ABB | SACE Tmax XT