Reclosing; Test Function - Eaton PKE12 Handbuch

1 Motor-protective circuit-breaker PKE12, PKE32 and PKE65
1.4 Setting the tripping CLASS

1.4.2 Reclosing

1.4.3 Test function

34
After a trip, an electric motor that has become excessively hot due to an
overload must first cool down. The motor may not be switched back on until
after this. In order to ensure that this condition is met, PKE motor-protective
circuit-breakers come with a thermal memory mechanism implemented in
their trip block.
￫
A cool condition will be reached after 20 minutes at the latest.
Table 3: Recovery times t
CLASS t
recovery
5 20 min
10 20 min
15 20 min
20 20 min
NOTICE
The motor's minimum cool-down time must also be taken into
account.
An additional testing mechanism can be used to check the motor-protective
circuit-breaker's functional capability.
2
1
3
Figure 7: Setting the test function
The active PKE motor-protective circuit-breaker is tripped by actuating the
test release with the help of a screwdriver
To allow the active PKE motor-protective circuit-breaker to trip in its test
position, a current corresponding at least with the minimum set value at the
trip block must flow.
PKE12, PKE32, PKE65 11/17 MN03402004Z-DE/EN www.eaton.com
after an overload trip
recovery
I
T E S T
TE ST
T R IP
≧ 0.3 A
I
≧ 1 A
≧ 3 A
≧ 8 A
≧ 16 A
3
.
3