ABB AO845A-eA 3BSE045584R2 module
Technical data of product parameters
Located to the left of the Voltage field. VP firmware is designed to stay in ‘normal’ AO845A-eA 3BSE045584R2
mode, and if it is not in ‘normal’ mode, to establish communications with the
Controller and then enter the ‘normal’ mode. In ‘normal’ mode, the VP receives its
target position from the Controller.
The MA algorithm that drives the VP target position may be in AUTO, MANUAL,
or LOCAL mode.When the VP is in ‘normal’ mode, it is not aware of the MA mode.
It receives target position from the Controller in MA AUTO and MANUAL. The
field will usually show AUTO unless there is an error condition or the VP enters AO845A-eA 3BSE045584R2
local mode due to a calibration sequence.
During calibration, the VP enters local mode, which corresponds to MA local mode.
The MA unconditionally tracks the VP until the calibration sequence completes.
When the operator selects a calibration sequence, the mode is shown as ‘local’. The
voltage will change as the valve is moving. When the valve is at the endpoint and AO845A-eA 3BSE045584R2
the demodulator gain is adjusting, the voltage will change as the gain is adjusted. A
calibration complete message is displayed at the bottom field. In some cases in a full
calibration, the results may yield poor values. A message will display telling the AO845A-eA 3BSE045584R2
operator to repeat the calibrationVPs in a redundant subsystem can be calibrated as a pair or independently. The
same commands are used to perform either calibration.
If you want to calibrate the VPs independently, the easiest method is to pull one of
the VPs out of the mounting unit. In this case, calibration is the same as for a nonredundant VP (see Section 25-6). When a VP is calibrated and the Backup is not in
service, and the RDNDNT flag is set, a warming message is printed to inform the
operator that he is calibrating only one VP of the pair.
Product picture display
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