ABB | SACE Tmax XT
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Protections | 8 - Motor protections
8 - Motor protections
Elenco
The Motor Protection package, available by default and only for Ekip M Touch, comprises protections:
Name
Type of protection
Page
R JAM
Motor block (post startup)
R STALL
Motor block (always activated)
UC
Under-current
U
Phase loss
PTC
Maximum temperature
The Motor protections conform to standard IEC 60947-4-1 and relative annex 2.
Trip class and parameters
The trip class mentioned in standard IEC 60947-4-1 is available in Trip units with Motor Class parameter
(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
t1 (s)
Motor start-up (s)
tmem res (min)
5E
12
3
5
10E
22
5
10
20E
45
10
20
30E
72
20
33
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
Thresholds
Unlike the other current protections, the R Stall, R Jam and UC thresholds are not related to In, but to
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)
