Fieldbus; Power Loss Ride-Through Function; Ground Fault Monitoring; Reduced Run Function - ABB ACS800 Hardware Manual

Fieldbus

For more information on the fieldbus communication, see ACS800 diode supply
control program firmware manual (3AUA0000068937[English]).

Power loss ride-through function

The power loss ride-through function keeps the supply unit operative over an
unexpected input power break. You can activate the function and define the delay
time in the DSU control program. For more information, see ACS800 diode supply
control program firmware manual (3AUA0000068937 [English]).
Note: Supply units equipped with a main breaker (option +F255) have the ride-
through function available only when a terminal for external control voltage (option
+G307) is used and supplied with UPS. With a main switch-disconnector (option
+F253) the ride-through function is available as standard also without the UPS.

Ground fault monitoring

Ground fault current monitoring is available on the inverter side for TN networks.
The DSU does not monitor ground current in an IT (ungrounded) network. However,
the unit can be equipped with an optional insulation monitoring device (option
+Q954). The device detects ground faults by monitoring the insulation resistance
between the power line and ground. When the resistance value goes below the
user-defined limit, the device evokes the DSU ground fault monitoring through a
digital input. You can define the DSU operation in an ground fault with the DSU
parameters. For more information, see the documentation of the monitoring device
delivered with the drive, and parameter group 30 in ACS800 diode supply control
program firmware manual (3AUA0000068937[English]).

Reduced run function

If one of the parallel-connected supply or inverter modules must be taken out of the
cabinet for service, it is possible to continue operation using the remaining modules
at reduced power. See Redundancy (Reduced run capability).
Hardware description
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