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Pantech Instruments A881 A881 微处理器控制器说明书.pdf
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Pantech Instruments A881 A881 微处理器控制器说明书
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www.pantechindia.com
Technical Catalogue
AUTO MANUAL STATIONS
MODEL 881/A881
Microprocessor based and fully configurable
Introduction
The revised and updated version of Model 881 of Pantech Instruments is A881.
Pantech's Model A881 are Microprocessor based Auto Manual Controllers, and are designed to control and display control
parameters. The instrument serves purpose of an A/M Controller along with an indicator with retransmission output. As an
A/M controller, the instrument accepts 4-20 mA input from possible sources like DCS and gives at the output in the normal
AUTO mode. During the possible breakdown, the control shifts from the AUTO mode to the MANUAL mode, and the user
can now control the output 4-20 mA from the control keys provided on the front panel. This transfer is bumpless. Even in
case of failure of A/M station, the controller continuos its control in auto mode. The optional auto bias feature of the
instrument allows even manual to auto transfer bumpless. The bias is set automatically in manual mode to allow this bumpless
transfer and then it can be changed by the same push buttons in auto mode. External feedback signal o/p from the A/M
station allows controller to track A/M output in manual mode. The rates of change of output (in manual mode) and bias
(in auto mode) are 1% and 10% per sec.. The instrument has a 4 digit display which displays the Output parameters as
configured by the user.
The instrument also accepts another 4-20 mA input, displays as a 4 digit display as configured by the user, and gives
optional 4-20 mA retransmission signal. The instrument provides 24 V DC transmitter power supply to power up mA transmitter
in 2 wire or 4 wire connection system.The modules incorporate low drift operational amplifiers and industrial grade components.
Burn out of each module ensures a long trouble free operation
Model A881 ( formerly 881 )
Push Buttons 5 ( Up, Down, A, M, I/O, F )
Up, Down, F Up and Down keys used to vary the output in the Manual Mode. When these keys are
Used along with F ( Fast ) key the output can be varied very Fast.
A Used to get back the instrument in Auto mode
M Used to get back the instrument in Manual mode
I/O Used to sense the Input condition : healthy or erroneous
Indications 4 digit green/red LED for Controller O/P ( channel – 1 o/p for DCS )
4 digit green/red LED for Position feedback - optional
2 LEDs indication on the front fascia for : AUTO or MANUAL Indication
1 LED indication on the front fascia for Input = Output ( on channel – 1 )
Inputs 2 nos. of 4-20 mA ( Analog inputs )
Input 1 for channel 1 ( For Auto Manual Action , For Controller o/p , from DCS )
Input 2 for channel 2 ( For Position Transmitter ) - optional
Outputs 2 nos of 4-20 mA ( Analog outputs )
Output 1 on channel 1 ( Based on Auto/Manual state, Controller O/P ) [ Reverse mode also possible ]
Output 2 on channel 2 ( Based on the Process Value display ) - optional
O/P Load Upto 800 ohms ** additional / special o/p possible on confirmations
Relay O/P 2 Relay outputs ( Digital outputs ) provided
First relay output on Instrument Fail
Second relay output on Auto/Manual selection ** special relay outputs on confirmations
Tracking Tracking time field adjustable from the front fascia only
Controller O/P can be varied from this
Accuracy Display accuracy of 0.15% of full span
Output accuracy of 0.15% of full span
Power 230 V AC +/- 10% @ 50 Hz. OR 110 V AC +/- 10% @ 50 Hz OR 24 V DC // or SPECIALS
Enclosure Metal sheet powder coated / ABS Plastic
Dimensions 96*96 / 72*144 / 48*96 / specials ( w*h ) mm
Mounting Panel / Wall / Field / specials
Terminals Screw type on the back side of the instrument
Amb. Temp. 0-50 deg. C
Humidity 90% RH
Password single level password protected
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