5.8.1.2 Mains Terminal Connections in 4-
Drive Module Systems
Illustration 8.11 shows the bus bar connections for 4-drive
systems. If a common terminal design is used, there is 1
set of mains terminals in each cabinet.
NOTICE
MULTIPLE MAINS CABLES
If connecting more than 1 set of mains terminals, use the
same number, size, and length of cables for each set of
terminals. For example, do not use 1 cable on one mains
terminal and 2 cables on another mains terminal.
1. Measure between the common terminals and the
1
st
common point of a phase.
1a For 6-pulse modules, it is typically the
mains terminals.
1b For 12-pulse drive modules, the set of
cables from the 1
st
cabinet connects to
the star-secondary winding of the 12-
pulse transformer. The set from the 2
nd
cabinet connects to the delta-secondary
winding of the 12-pulse transformer.
2. Strip a section of the outer cable insulation.
3. Connect the ground wire to the nearest ground
terminal.
4. Connect the 3-phase mains wiring to terminals
R/91, S/92, and T/93 using M10 screws.
5. Tighten the mains terminals. See
chapter 7.9.1 Tightening Torques for Terminals.
5.8.2 12-Pulse Disconnector Conguration
This section describes how to use a disconnector for a 12-
pulse drive system. When using disconnectors or
contactors, make sure to install an interlock. When
installed, both contactors or disconnectors should close to
avoid 1 set of rectiers not working. See Illustration 8.1 for
a diagram of these connections.
The selected contactors or mains disconnectors should
have NC auxiliary contacts routed as shown. Connect the
interlock in series with the Klixon switch of the brake. If
only 1 contactor/disconnector has closed, the LCP shows
the error Brake IGBT Fault and does not allow the drive
system to power the motor. Illustration 8.2 shows a BRF
connection with 12-pulse disconnector and interlock.
NOTICE
If the brake option is not selected, the Klixon switch can
be bypassed.
NOTICE
Danfoss is not responsible for any failure or malfunction
in the disconnector/contactor switch.
Electrical Installation Installation Guide
MG37K302 Danfoss A/S © 08/2017 All rights reserved. 29
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