ABB 128877-103 excitation system

The process voltage supervision input give channel error signals if

the voltage disappears. The error signal can be read through the

ModuleBus. The outputs are current limited and protected against

over temperature. If the outputs are overloaded the output current

wi l be limited.

Features and benefits

• 16 channels for 24 V d.c. current sourcing outputs

• 2 isolated groups of 8 channels with process voltage supervision

• Output status indicators

• OSP sets outputs to predetermined state upon error detection

• Short-circuit protection to ground and 30 V

• Over-voltage and over-temperature protection

The relay supply voltage supervision, derived from the 24 V

distributed on the ModuleBus, gives a channel signal error and a

module warning signal if the voltage disappears. The error signal and

warning signal can be read through the ModuleBus. This supervision

can be enabled/disabled with a parameter.

Features and benefits

• 8 channels for 110 V d.c. / 250 V a.c. relay Normaly Open (NO) outputs

• 8 isolated channels

• Process connection via detachable connectors