ABB CMA120 3DDE300400 Analog module industrial system controller

Description

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The power supply units (SD83x) are switch-mode power converters that convert a.c.
mains supply voltage to a regulated 24 V d.c. The mains input supply voltage can
either be 115 V a.c. or 230 V a.c. and is selected using a switch, mounted on the
front panel of the unit.
The power supply units can be used in both redundant and non-redundant
applications. When redundant power supply units are connected to a common load,
a voting device, (SS823), must be used to combine the two outputs to a single
output, via diodes. The redundant power supply units may be connected to
completely separate mains supplies or to the same mains supply, depending on the
configuration selected.
The L- output (0 V) of the power supply units can be used without being grounded.
If grounding is required, the power supply unit L- output (0 V) can be grounded
directly or via a suitable resistor.
The processor unit has no requirement for an uninterruptible power supply in order
to shut down safely. The processor unit has an internal power reservoir that lasts for
5 ms, which is sufficient for it to make a controlled power down. The power supply
units easily handle short power interruptions (<20 ms) that can normally occur
within any industrial environment. Despite this, it is sometimes necessary to protect
certain applications, from brief voltage failures, by installing Uninterruptible Power
Supply (UPS) devices.