Three-phase direct-to-mains connection topology – ElmoMC SimplIQ Digital Servo Drives-Trombone DC User Manual
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DC Trombone Installation Guide
Installation
MAN-DCTROIG (Ver. 1.601)
30
However, the DC Trombone can operate from a non-isolated/direct-to-mains DC power supply,
an isolated DC power supply or batteries.
When rectifying an AC voltage source, the AC voltage level must be limited to 270 VAC so as
not to exceed the maximum 390 VDC in the case of a 400 VDC drive, or 528 VAC so as not to
exceed the maximum 747 VDC in the case of an 800 VDC drive.
If the Trombone is connected to Elmo’s Tambourine power supply, then the end-user can
exploit the Tambourine’s options, such as EMI-filtering and shunt-regulator.
3.6.5.
Direct-to-Mains Power Source (Non-Isolated Rectifier)
This section relates to the configuration of the power supply and drive, which are connected
directly to the mains (Figure 7, Figure 8, Figure 9).
Recommended connection of the non-isolated DC power supply
1.
For best immunity, it is highly recommended to use twisted cables for the DC power supply
cable. A 3-wire shielded cable should be used. The gauge is determined by the actual
current consumption of the motor.
2.
Connect both ends of the cable shield to the closest PE connections.
3.
Tie one end to the power supply's PE terminal/ heat sink, and tie the other end either to
the PE terminal of the DC Trombone's power-connector, or attach it to one of the 6
mounting screws of the drive's heat sink.
3.6.5.1.
Three-Phase Direct-to-Mains Connection Topology
Figure 7: Non-Isolated Three-Phase Connection Topology
Caution:
Do not connect VN- to PE. In a direct-to-mains connection, the VN- must not
be connected to the PE, as this will cause irreparable damage to the system.
Take care to note, that in a direct-to-mains connection the Neutral point is not
the most negative voltage level. It is the mid-point level of the rectified DC
bus.