12-pulse series connection
4.2 Configuration
12-pulse applications
32 Compact User Manual, 09/2015, A5E34871844H
When using non-grounded low-voltage networks, an insulation monitoring device must be
used to monitor the insulation. The insulation resistance is continuously monitored, and if the
value falls below an adjustable threshold value, this is signaled.
Using external armature voltage sensing
The motor armature voltage can either be sensed in the devices themselves – or using an
external PT directly at the motor terminals.
The following differences should be noted:
●
Internal armature voltage sensing (p51854 = 0)
Every SINAMICS DCM senses its own output voltage (C-D), and uses this as armature
voltage.
The output voltage is wired inside the device.
The output voltage must be connected at inputs C and D on the voltage sensing
module.
For a series connection, the following applies:
The motor armature voltage is calculated in the device from the sum of the output
voltages of the master and slave.
For a series connection of a SINAMICS DCM and a diode bridge, the following a
The motor armature voltage is calculated
in the device from the sum of the output
voltages of the master and diode bridge. The diode bridge output voltage is calcu-
lated according to the formula "Ud = p51798" *output voltage of the master*.
External armature voltage sensing (p51854 = 1)
The motor armature voltage is connected via an external voltage transformer at X177.39-
30 (AI2). This measured value is used as armature voltage.
If the external armature voltage sensing is used, then it must be used at the master and
at the slave.
function diagram 6902 in the List Manual
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