30
SANTERNO
USER MANUAL
Fig. 4-1 Primary Circuit Wiring Diagram
The inlets and outlets of primary cable are located at the bottom of the cabinet. The input (L1, L2, and L3) and
output (U, V, W) terminals are located in the primary cabin of cell cabinet.
The earthing/grounded copper bar is mounted at the bottom of transformer cabinet in the left and back side. After
installation of VFD, the ground of transformer and cabinet should be connected to the earthing/grounded copper
bar and to the user ground grid.
Power inlet terminal,
connect transformer
primary winding
VFD output
terminal to motor
Earthing bus bar
Fig. 4-2 Primary Wiring Room
Caution!
MV VFD
● A wrong wiring of the input terminal as output terminal will lead to damage of VFD or casualty accidents!
Forbidden to exchange!
● After VFD is installed, AC withstand voltage test of the main transformer of the primary circuit and MV
cables should be processed. The test voltage is 85% of standard test voltage and dwell-time is 1 minute.
● Before the withstand voltage test, please disconnect all the cables between transformer and cells
to ensure product safety. Disconnect the cables of input voltage measuring from input terminal of
transformer, disconnect output cables of the 380V auxiliary winding of transformer, disconnect terminal of
temperature measuring resistor from temperature controller side.
● The code of the three phase cable terminals of the secondary winding of transformer and each cell
should be one-to-one correspondence!