Triconex 3805EN

Triconex 3805EN Analog Output Modules

Analog Output (AO) modules receive output signals from the Main Processor module on each of the three channels. Each set of data is then voted and a healthy channel is selected to drive the outputs. Each module monitors its own current outputs (as input voltages) and maintains an internal voltage reference to provide self-calibration and module health information.

Each channel on a module has a current loopback circuit which verifies the accuracy and presence of analog signals independently of load presence or channel selection. The module’s design prevents a non-selected channel from driving an analog signal to the field. In addition, ongoing diagnostics are performed on each channel and circuit of the module. Failure of any diagnostic test deactivates the faulty channel and activates the Fault indicator and the chassis alarm. The module Fault indicator merely indicates a channel fault, not a module failure.

The module continues to operate properly with as many as two channels failed. Open-loop detection is provided by a LOAD indicator which activates if the module is unable to drive current to one or more outputs. The module provides for redundant loop power sources with individual power and fuse indicators called PWR1 and PWR2. External loop power supplies for analog outputs must be provided by the user. A LOAD indicator activates if an open loop is detected on one or more output points.

PWR1 and PWR2 are on if loop power is present.

AO modules support hot- spare capability, which allows online replacement of a faulty module. AO modules require a separate external termination panel (ETP) with a cable interface to the Tricon backplane. Each module is mechanically keyed to prevent improper installation in a configured chassis. The Model 3805H module has been modified to support increased inductive loads. It is fully compatible for use in all applications of the 3805E module. The Model 3806E and Model 3807 modules are optimized for turbomachinery control.

The Model 3806E High Current AO Module has two 20 to 320 mA outputs to drive servo actuators.The Model 3807 BiPolar AO Module has four -60 to + 60 mA outputs to drive servo coils in servo-control applications. The termination panel for theModel 3807 contains four hard-wired coil diagnostic inputs. The Model 3807 is designed for control applications only, and should not be used in safety applications.

Analog Output Module Specifications

Model Number: 3805E/3805H

Type: TMR, AO

Output current range: 4-20 mA output (+6% over range)

Number of points: 8 output

Isolated points: No, commoned return, DC-coupled

Resolution: 12 bits

Output Accuracy: <0.25% (in range of4-20 mA) ofFSR (0-21.2 mA), from 32° to 140°

F(0°to60°C)

External loop power: +42.5 VDC, maximum

(reverse voltage protected) +24 VDC, nominal

Output loop powerrequirements

Load (Ohms): Loop power required250> 20 VDC(1 amp minimum)

500> 25 VDC(1 amp minimum)

750> 30 VDC (1 amp minimum)

1000> 35 VDC(1 amp minimum)

Over-range protection: +42.5 VDC, continuous

Switch time on leg failure: < 10 ms, typical

Diagnostic Indicators

Module status: PASS, FAULT, ACTIVE,

(one each per module): LOAD, PWR1, PWR2

Color code: Pea green

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