The digital servo module (DSDM) is built around a 32 bit controller with associated circuits. The system has 3 Nos. of isolated analog input facility which can be selected as either 4-20ma inputs or 0-10V inputs using jumper selection. Similarly there is a facility for 4-20ma / 0-10V analog input which is taken as reference signal for PID loop. The PID output is given in both 4-20ma and 0-10V format with isolation. There is a RED LED in the PCB glows to indicate when there is a OPEN in 4-20ma output.

The main features of this system are:

          24V +/-4V, DC power input.

          Three Channel Current, Position Inputs. 4-20 ma Current / 0-10V with Isolation. (Conversion accuracy 0.05%)

          Single Channel Current, Position Inputs. 4-20 ma Current / 0-10V without Isolation (Conversion accuracy 0.05%)

Module Output:

          PID Controller Output1, 4-20 ma +/-50uA with Isolation

          PID Controller Output2, 0-10 V +/-20 mv.

          Fault Annunciation through potential free relay contacts.

Module response

          The required response time as measured from input change of 0-100% to corresponding output change shall be within a max of 10 mSec

PID Loop constant Setting

          Using external PID loop constant setting module with key pads and alphanumeric display

cPCI based switching board

The card is a cPCI, 3U form factor system with necessary connectors at the front panel. As the name indicates, the primary function of the card is to switch two sets of 3 modem inputs to a single output for radio connectivity.

The rear end of the card is mounted with P1 and P2 connectors for cPCI connectivity. These connectors have all the cPCI bus signals along with power supply lines. The electronics on the MSB board requires +3.3V, +5V and +12V DC power which has been derived from the cPCI bus.

cPCI interface signals from P1 and P2 connectors are first routed to the PCI to serials bridge controller. The PLX technology make OXuPCI952_LQFP176 has been used as PCI to serial bridge controller, incorporating PLX ultra high performance Oxford 950 UART technology.

          Modem Switching Board (MSB) is a 3U cPCI form factor

          Extended temperature Operation (-40°C to +85°C).

          Multiplexer Card used to switch any one of the two 2.4 kbps, 9.6 kbps, Hurricane Modems

          cPCI bridge interfaced to a 32 bit controller.

          20 Mechanical relays used for modem signal switching

          Isolation transformer with impedance matching circuit for Modem audio signals

          < 5W power requirement

Dual PID Temperature controller

This system is built around a 32 bit controller which is simultaneously interfaced to MMI, TFT panel and dual RTDs. The controller implements two PID loop for controlling temperature at two separate chambers with RTD sensors mounted inside. MMI with touch panel will help to set required temperature in the chamber. TFT panel with 480x320 resolution is used to display parameters. Isolated RS485 interface is used for MOD BUS communication with external world. The system has successfully completed FAA certification process.

          24V, +/- 8V, DC power input

          Two RTD interface with separate PID controller

          480x320 TFT Interface

          Capacitive touch panel with 4 keys and intelligent backlight

          Isolated RS485 communication for MOD BUS implementation         

PID Temperature controller

This system is built around a 16 bit controller which is interfaced to MMI, OLED panel and one RTD temperature sensor. The controller implements PID loop for controlling temperature at one chamber with RTD sensor mounted inside. MMI with touch panel will help to set required temperature in the chamber. OLED panel with 240x64 resolutions is used to display parameters. The controller is also interfaced to solid state compressor controller for displaying compressor status in the OLED. Isolated RS485 interface is used for MOD BUS communication with external world. The system has successfully completed FAA certification process.

          24V, +/-8V, DC power input

          RTD interface with separate PID controller.

          240x64 OLED Interface.

          Interfaced to compressor controller with isolated RS232 interface.

          Capacitive touch panel with 4 keys.

          Isolated RS485 communication for MOD BUS implementation

Heating Process Controller

Heating process controller specially designed for Micro Oven kind of application is designed around a 16 bit controller. It has got two separate PCBs, one is the controller board and the other is power board. The power board designed with industrial grade power relays is used to switch power with necessary limit switch interlock. It also generates required DC power for the controller and also for switching power relays.

The controller board is interfaced to capacitive touch panel with 9 keys and a 128x64 LCD display. The controller is fused with a sophisticated embedded software with all necessary Normal, Defrost, Popcorn and Preheat mode of operation. The required mode of operation can be selected with the dedicated MMI keys. The controller is also provided with isolated RS485 interface through which MOD BUS protocol is implemented. All the operations of the controller with status monitoring can be done remotely with sophisticated MOD BUS commands. The system has successfully completed FAA certification process.

          115V AC or 28V DC power input

          Capacitive touch panel with 9 keys

          128x64 pixel, LCD Interface.

          All the necessary Modes of operation are implemented

          Isolated RS485 communication for MOD BUS implementation