Connecting the dc power – ElmoMC SimplIQ Digital Servo Drives-Trombone Installation Guide User Manual
Page 28
Trombone Installation Guide
Installation
MAN-TROIG (Ver. 1.403)
28
3.7.2.
Connecting the DC Power
The DC power for the Trombone is delivered from a separated rectifying unit (supplied by the
user). The following sections contain topology recommendations for implementing three-phase
and a single-phase supply chains. Elmo offers the end-user, the option to purchase its
Tambourine rectifier, which offers a range of versatile options.
The power stage of the Trombone is fully isolated from the other sections of the Trombone,
such as the control-stage and the heat sink. This isolation allows the user to connect the
common of the control section to the PE, a connection that significantly contributes to proper
functionality, safety and EMI immunity, leading to better performance of the Trombone.
In addition, this isolation simplifies the requirements of the DC power supply that is used to
power the DC bus of the Trombone, by allowing it to operate with a non-isolated DC power
source (a direct-to-mains connection) which eliminates the need for a bulky and expensive
isolation transformer.
However, as well as operating from a non-isolated/direct-to-mains DC power supply, the
Trombone can also operate from an isolated 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.
3.7.2.1.
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 6, Figure 7, Figure 8 and Figure 9).
Recommended connection of a 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, and tie the other end to the PE pins of the
module/PE terminal of the integration board, or attach it to one of the four mounting
screws of the drive’s heat sink.