Manufacturers of Process
Control Instruments
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Auto Manual Stations-A881
 
 
7660
 
7660
 
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  • Rugged & Time Proven Designs
  • Microprocessor based & Fully Configurable
  • All Hi-end Control Station Features fed in
  • Available in standard / customized versions
  • Various Sizes / Mountings / Enclosures supported
 
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

 
Detailed specifications for PANTECH make AUTO/MANUAL station
 
Model A881 ( formerly 881 )    
Push Buttons
Up, Down, F

A
M
I/O
5 ( Up, Down, A, M, I/O, 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.
Used to get back the instrument in Auto mode
Used to get back the instrument in Manual mode
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 )
Outputs




O/P Load
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


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
Dimensions
Mounting

Terminals
Metal sheet powder coated / ABS Plastic

96*96 / 72*144 / 48*96 / specials ( w*h ) mm

Panel / Wall / Field / specials
Screw type on the back side of the instrument
Amb. Temp 0-50 deg. C
Humidity
Password 
90% RH
single level password protected
 
Ordering Information
 

Please confirm the availability of the model by cross checking the above section.

 

Basic Model No. (Specified by first 3 digits)

A881 - Auto Manual Controller

 

Mounting (Specified by letter following 3 digits)

P - Weatherproof - Panel

W - Weatherproof - Wall

F - Flameproof - Wall / field

I - IP65 grade – wall / field

S - Specials

 

Display / No. of channels option (Specified by the next digit / letter)

1 - Single ( for A/M action )

2 - Dual display ( One for

PV, another for A/M action )

 

Power (Specified by the next digit / letter)

1 - 24 V DC

2 - 110 V AC

3 - 230 V AC

S - SPECIALS

  Auxiliary output on PV channel (Specified by the next digit / letter)

0 - None

1 - 1 nos. isolated output

S - Specials

 

Additional output on A/M channel

( Other output signals then the default A/M signal )

(Specified by the next digit / letter)

0 - None

S - Special signal outputs

 

Contact outputs (Specified by the next digit / letter)

0 - None

1 - A/M Fail ( Instrument fail )

2 - Auto Fail (Auto <> Manual )

3 - Both of the above types

S - Specials