5shx2614510 ABB Type of grid thyristor

Eight different types of MTUs can be used. The Extended MTU (for example

TU830/TU833) enables three wire connection to the sensors without additional

terminals. The Compact MTU (for example TU810, TU814) has terminals for

process voltage supervision inputs, but requires external terminals for distribution of

process power supply to the sensors. The TU818 Compact MTU provides

connection to 2-wire sensors without external marshaling. The extended MTU,

TU838, provide a fuse (3 A max.) per two channels for process power out. The

TU812 Compact MTU has a D-Sub 25 pin (male) connector for connection to the

process. TU850 provides one disconnectable PTC fused sensor/transmitter power

outlet terminal per channel.

Event Recording

The DI830 Input Module can be used for event recording (SOE), that is, changing

signals at digital input channels can be announced together with a time stamp

indicating when it occurred. Events are generated on both positive and negative

going edges of the signal. The time stamp has a resolution of 0.4 millisecond, and is

compensated for the filter time.

The module has intermediate storage for 32 events.

The SOE functionality can be switched on and off per channel.

For all channels with enabled SOE capability, a shutter filter is implemented that

prevents intermediate storage for events from overflow. The shutter filter is closed

as soon as the number of events generated within the shutter period (0-255 seconds)

exceeds the shutter trigger number (0-255 changes). The shutter filter remains

closed as long as the recovery time (0-65535 seconds) has not expired.

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