Routing and connecting a neutral
conductor (N)
If a neutral conductor is used together with a three-phase connection, it
should not be installed unfiltered in zones B and C, in order to keep
interference off the mains.
Motor fan at mains filter
Single-phase or three-phase supply lines of motor fans, that are usually
routed in parallel with motor power cables or interference-susceptible lines,
have to be filtered:
●
In drive systems with regenerative supply units via a separate single-
phase (NFE type) or three-phase filter (NFD type) near the mains
connection of the control cabinet
●
In drive systems with only feeding supply units via the available three-
phase filter of the drive system
On the load side of the mains filter, voltage against ground with a high
rise of voltage dv/dt can be present and interfere with the additional
loads connected there.
When switching power off, make sure the fan is not switched off.
Loads at drive system mains filter
Only operate allowed loads at the mains filter of the drive system!
At the three-phase filter for the power connection of regenerative
supply units, it is only allowed to operate the following loads:
●
HMV supply unit with mains choke and, if necessary, mains
contactor
Do not operate any motor fans, power supply units etc. at the
mains filter of the drive system.
Shielding mains supply lines in the
control cabinet
If there is a high degree of interference injection to the mains supply line
within the control cabinet, although you have observed the above instructions
(to be found out by EMC measurement according to standard), proceed as
follows:
●
Only use shielded lines in area A
●
Connect shields to the mounting plate at the beginning and the end of
the line by means of clips
The same procedure may be required for long cables of more than 2 m
between the point of power supply connection of the control cabinet and the
filter within the control cabinet.
Mains filters for AC drives
Ideally mount the mains filter on the parting line between the areas A and B.
Make sure the ground connection between filter housing and housing of the
drive controllers has good electrically conductive properties.
If single-phase loads are connected on the load side of the filter, their current
may be a maximum of 10% of the three-phase operating current. A highly
unbalanced load of the filter would deteriorate its interference suppression
capacity.
If the mains voltage is more than 480 V, connect the filter to the output side of
the transformer and not to the supply side of the transformer.
Grounding
In the case of bad ground connections in the system, the distance between
the lines to grounding points E1 and E2 in area A and the other grounding
points of the drive system should be at least d4 = 400 mm in order to
minimize interference injection from ground and ground cables to the mains
supply lines.
See also
Division into areas (zones), page 55
Equipment grounding conductor
connection point at machine, sys‐
tem, control cabinet
The equipment grounding conductor of the power cable for the machine,
system or control cabinet has to be permanently connected at point PE and
have a cross section of at least 10 mm
2
, or be complemented by a second
IndraDrive X Drive Controllers Power Sections XCS1, XMD1,
XMQ1
59/123
Mounting, dismounting and electrical installation
R911392532_Edition 01 Bosch Rexroth AG
