Connecting the dc power – ElmoMC SimplIQ Digital Servo Drives-Drum HV User Manual
Page 30
Drum HV (High Voltage) Installation Guide
Installation
MAN-DRU-HVIG (Ver. 1.602)
30
3.5.3.2.
Connecting the DC Power
The DC power to the Drum HV (High Voltage) is delivered from a separated rectifying-unit
(supplied by the user). Following are topology recommendations, of how to implement a 3x
phases and a supply chain.
The Power-stage of the Drum HV (High Voltage) is fully isolated from other sections of the
Drum HV (High Voltage), 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 which significantly
contributes to proper functionality, safety and EMI immunity, leading to better performance of
the Drum HV (High Voltage).
In addition, this isolation simplifies the requirements of the DC power supply that is used to
power the DC bus of the Drum HV (High Voltage), by allowing the operation with a non-isolated
DC power source, a direct-to-mains connection, eliminating the need in a bulky and expensive
isolation transformer.
However, the Drum HV (High Voltage) can operate from either non-isolated/direct-to-mains DC
power supply, or isolated DC power supply / batteries.
When rectifying the AC voltage source, the AC voltage-level must be limited to 270 VAC not to
exceed the max 390 VDC in the case of a 400 VDC drive, or limited to 528 VAC not to exceed
the max 747 VDC in the case of an 800 VDC drive.
3.5.3.3.
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.
To connect 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, and tie the other end either to one of the
four mounting screws of the drive’s heat sink-PE.
4.
To close the power supply cable into the drive, use the barrel connector, M6 spring washer
and M6 nut (in the drive). The required torque is 3 to 4 Nm.
5.
To close the PE wire into the drive, use the barrel connector, M6 flat washer, M6 spring
washer and M6 screw to the heat sink. The required torque is 3 to 4 Nm.