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Digitax HD M75X Series Installation and Technical Guide 51
Issue Number: 5
4.2.3 Input inductor calculation
To calculate the inductance required (at Y %), use the following equation:
Where:
I = drive rated input current (A)
L = inductance (H)
f = supply frequency (Hz)
V = voltage between lines
4.3 Supplying the drive with DC
All drive sizes have the option to be powered from an external DC power supply. Refer to section 4.1 Power and ground connections on page 48 to
identify the location of DC supply connections.
4.3.1 DC terminal cover access/removal
The DC supply connections are located under the DC terminal cover.
Figure 4-3 Location of the DC terminal cover (frame 1, 2 and 3)
1. DC terminal cover.
Contact the supplier of the drive before connecting a Digitax HD M75X series drive to a DC bus supplied from a regenerative drive or AFE
module.
Isolation device
The AC and DC power supply must be disconnected from the drive using an approved isolation device before any cover is removed from
the drive or before any servicing work is performed.
Stored charge
The drive contains capacitors that remain charged to a potentially lethal voltage after the AC and/or DC power supply has been
disconnected. If the drive has been energized, the power supply must be isolated at least ten minutes before work may continue.
Normally, the capacitors are discharged by an internal resistor. Under certain, unusual fault conditions, it is possible that the capacitors may
fail to discharge, or be prevented from being discharged by a voltage applied to the output terminals.
L
Y
100
----------
V
3
-------
1
2fI
------------
=
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