Monitoring Functions And Protective Functions; Insulation Monitoring - Siemens SINAMICS GM150 Operating And Installation Instructions

Parameter
p4060[0]
Setting for the y coordinate in % of the second point on the scaling characteristic.
8.4.3

Monitoring functions and protective functions

The drive features hardware and software functions that protect it against faults and damage
caused by impermissible operating statuses or hardware malfunctions. The monitoring
elements provide internal microprocessor-controlled monitoring and remote device monitoring.
8.4.3.1

Insulation monitoring

The drive is operated in an ungrounded IT supply system. This means that the drive can
continue to operate if just one ground fault occurs.
Note
A second ground fault causes the drive to fail.
For safety reasons, it is necessary to detect such ground faults, in order to eliminate the risk
of electric shock on the drive. This is the reason why the drive is equipped with insulation
monitoring (A-Isometer) that continually monitors the insulation state of the drive including that
of the motor.
Only one A-Isometer can be connected to each live connected IT system. The A-Isometer
adjusts monitoring in line with the line discharge capacitance. The A-Isometer is connected
between the ungrounded line supply and the equipotential bonding conductor (PE).
For the duration of testing, disconnect the instrument cables of the A-Isometer when performing
any insulation or voltage testing on the power system.
Self-test
The A-Isometer performs an automatic self-test under the following conditions:
● When the insulation resistance of the line supply > 20 MΏ
● Every 24 hours when an output relay for the system error message has been preselected.
Terminal monitoring
The connections to mains and ground (PE) are monitored continuously. If the cables are
interrupted or not connected, or if their resistance is high, this is indicated on the LCD. In this
case, please check the terminal conductors immediately, as the insulation resistance is not
being measured properly.
SINAMICS GM150 6SL3815-2LN41-4AA2
Operating Instructions 04/2017
Value
Analog inputs, characteristic value y1
8.4 Functions
Adjustment range
-1000.00 to 1000.00%
Default settings: 100,00 %
Operation
179