14
DCS800-EP Installation and Start-Up Manual
Planning the electrical installation
What this chapter contains
This chapter contains the instructions for selecting the cables, cable routing and line
reactors for the drive panel. Always follow local regulations.
Note:
If the recommendations given by ABB are not followed, the drive may
experience problems that are not necessarily covered by the warranty.
Reference:
Technical Guide
– publ. no.: 3ADW000163
Options for the drive
Line reactors
When thyristor power converters operate, the line voltage is short-circuited during
commutation from one thyristor to the next. This operation causes voltage dips in the
mains PCC (point of common coupling). Some ACS800-EP Panel Drives are
shipped with an internal 1.5% line reactor and some are not (as indicated by the
drive’s Plus Code). For the connection of a power converter system to the mains,
one of the following configurations should be applied:
Configuration A
When using the power converter, a minimum of impedance is required to
ensure proper performance of the snubber circuit. A line reactor can be
used to meet this minimum impedance requirement. The value must
therefore not drop below 1% u
k
(relative impedance voltage). It should
not exceed 10% u
k
, due to considerable voltage drops at converter
output.
Configuration B
If special requirements have to be met at the PCC (standards like EN
61800-3, DC and AC drives at the same line, etc), different criteria must be
applied for selecting a line reactor. These requirements are often defined
as a voltage dip in percent of the nominal supply voltage. The combined
impedance of Z
Line
and Z
L1
constitute the total series impedance of the
installation. The ratio between the line impedance and the line reactor
impedance determines the voltage dip at the connecting point. In such
cases line chokes with an impedance around 4% are often used.
Example calculation with U
k Line
=1%; U
k L1
=4%;
Voltage Dip = Z
Line
/
(Z
Line
+Z
L1
)=20%
. Detailed calculation see Technical Guide.
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