January 2012 3.7 MS 110 / MS 111 Installation Kit for Double-Row Configuration 199
3.7 MS 110 / MS 111 Installation Kit for Double-Row Configuration
3.7.1 General information
Sometimes limited space prevents the control and inverter system from being
mounted in the same row in a machine’s electrical cabinet, meaning that they
must be mounted in two separate rows. In other cases the design calls for a
second electrical cabinet to house the inverter system. This means that the
distribution and arrangement of the components can be very different from
case to case.
In order to establish an electrical connection (immune to noise) between the
components of the inverter system, the MS 1xx installation kits are needed.
The ribbon cables (unit bus, PWM lines, supply bus) from the other compo-
nents are connected to the MS mounting cases, and shielded round cables of
the appropriate lengths connect the MS mounting cases with each other.
In some cases, in order to ensure that the power supply for the fans of the
inverters is maintained under all circumstances, it is also necessary to feed
24 V from an external power supply unit to the unit bus (since this is handled
by the unit bus).
In most cases the additional 24 V are not needed, since the UVR 1xxD pro-
vides enough current for the fans.
If this is the case, and a double-row configuration is used, then two MS 110
mounting cases are necessary (see basic circuit diagram). For the current con-
sumption of the fans, refer to the "Inverter Systems and Motors" Technical
Manual. Based on these values you can calculate whether feeding in the addi-
tional 24 V is necessary.
For inverter systems with many powerful UM 1xxD power modules, it might
be the case that the current provided by the UV(R)1xx power supply unit for
the fans of the UMs does not suffice to guarantee safe and reliable operation
of the fans. The sum of the currents must not exceed the maximum current
provided by the UV(R).
If it is exceeded, then an MS111 must be used in the inverter row where the
current consumption is very high.
With the MS 111, the 24 V from an external 24 V power supply unit are fed to
the unit bus X79 in order to ensure reliable operation of the fans, and therefore
the reliable cooling of the inverters. The 24 V supply that is routed via X79C is
interrupted internally at the MS 111.
With the MS 111, an additional power supply unit must be used for the 24
V power supply of the fans.
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