Internal Ground-Fault Monitoring When Using A 2Nd Generation Current / Voltage; Measuring Module - Siemens SIMOCODE pro Operating Manual

4.3.1.3

Internal ground-fault monitoring when using a 2nd generation current / voltage

measuring module

Settings
You can parameterize two different response levels (trip level, warning level) for monitoring
the ground-fault current.
If the ground-fault current exceeds the response level, the current limit monitoring will
respond.
See also "Tables of responses of SIMOCODE pro" in Chapter Important information
(Page 7).
Figure 4-29
Trip level, warning level
You can parameterize two different response levels (trip level, warning level) for monitoring
the ground-fault current.
If the ground-fault current exceeds the response level, the current limit monitoring will
respond.
The lowest value for internal ground-fault monitoring that can be set as the warning and trip
level is 10 % of the set rated motor current I
The thresholds are entered in A.
Two use cases are distinguished depending on the effective motor current through the
measuring module:
● Normal stationary use case up to 2x rated motor current I
the value of the set trip/warning levels are detected. Ground-fault monitoring fulfills the
accuracy requirements of IEC 60947-1 Class II-B.
● Temporary starting or overload operation greater than 2x rated motor current I
Responsiveness in the overload range of > 2x rated motor current is reduced to reduce
false tripping. Residual currents of > 1/2 * I_trip level/I_s * I_max (of the effective motor
current) are detected.
SIMOCODE pro - Parameterize
Operating Manual, 04/2017, A5E40507630002A/RS-AA/001
"Ground-fault Monitoring" function block
.
s
: Residual currents greater than
s
Parameters
4.3 Monitoring functions
:
s
127