Emerson Rosemount CCO 5500, Reference Manual

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2.6 Electrical data
2.6.1 AC supplies
You can power the Rosemount
™
CCO 5500 Analyzer from either 85-135 Vac or 170-264
Vac at 50/60 Hz. A switch within the power supply unit selects the input voltage, and an
internal 2 A fuse protects the instrument. The analyzer tolerates voltage fluctuations
within these ranges without losing performance. The total power requirement for the
analyzer is less than 50 VA.
2.6.2 Outputs
Three analyzer outputs are available:
1. Selectable, fully isolated 4-20 mA or 0-20 mA % CO concentration, 500 ohms
maximum load.
2. Single pole, switching relays (rated 250 V, 10 A) for the following outputs:
• Alarm trigger at a selectable gas threshold.
• Data-valid indication active during power failure and any equipment fault
condition. See
Chapter 6 for further details.
3. Four-wire serial data link for two-way communication between the control unit and
a distributed control system or other process control system.
2.6.3 Normalizing inputs
The analyzer can hold pressure, temperature, and oxygen values to normalize the
calculated gas value to standard conditions. The instrument may read these values using
the following methods:
1. Fixed value from the keypad.
2. 4-20 mA outputs from measurment transducers. You can set the ranges
represented by these inputs from within the processor. These are analog process
inputs to the control unit.
3. When the analyzer is part of an integrated system, the serial data line can carry the
normalizing values.
2.6.4 Plant status input
The plant status input parameter is available to prevent the rolling average data from
being diluted by measurements made while the plant is shut down. The parameter is
governed by one of three choices:
1. Serial input (from an integrated system)
2. Logic input (terminals PS1 and PS2 in the control unit)
3. Multiple (five variables)
a. Temperature
Install
Reference Manual 17