2001VT Temp & CO 2. - air quality sensor/controller NOTE!!! Manual for Installation. General. SenseAir AB

Transcription

1 2001VT Temp & CO 2 - air quality sensor/controller Manual for Installation SenseAir AB EM_2001VT _rev4/dec. -00 General The IAQ-sensor 2001 VentoThermostat is a carbon dioxide and temperature monitor and at the same time a very flexible controller, with programmable outputs for linear control of, for instance, valves or speed regulated fans. The unit can be hooked up directly to common DCV (Demand Controlled Ventilation) regulators available on the market or to computerized DDC systems. The controller functions are preprogrammed at the factory but can be altered from a computer and a service kit, that contains a communication cable and the user interface software "UIP for 2001VT". 1 G+ 2 GND 3 DIG1 4 12VDC 5 GND 24V ac/dc power input aux. external digital signal source & power 9 AN1 10 GND 11 AN2 12 GND analogue outputs push buttons temperature sensor Figure 1. The connector numberings for the electrical wiring to the 2001VT printed circuit board. The power supply shall be connected to TB-1 (halfwave rectifier input) and TB-2 (ground). If the analogue output is to be connected, the same groundings have to be wired for the 2001VT unit and for the signal evaluation system! Unless different transformers are used, special caution have to be taken: - The 2001VT signal ground is not galvanically separated from the 2001VT power supply! NOTE!!!

2 Location The IAQ-sensor has to be located in a spot representative for the area to be controlled. Locations with direct draft, as well as areas with bad air mixings, should be avoided. To reduce the risk for sabotage or exposure to direct human exhalation it is recommended that the sensor s to be placed at a level of at least 2 meters above the floor. Access to the sensor is only needed for maintenance. Wall mounting 1) Choose an environmentally proper location, taking into account the risk for cross draft, large temperature variations, risk for humidity build-up, etc. 2) Take the 2001-VentoThermostat unit apart into its three main components; - the mounting plate, the sensor with its printed circuit board, and the cover. The electronic board is attached to the mounting plate with snap-ins. Study this prior to detachment! 3) Fasten the mounting plate to the wall in such a way that the wires will exit through the opening (see figure 2). 4) Bend the wires out to the right and put the electronic board into position again. The electronic board should first be guided into the mounting plate slots on the left hand side and then be pressed down on the right hand side to fit the two snap-ins. 5) Attach the cables according to the information given in table I. Be aware of electrostatic discharge (ESD) exposures that could damage the electronics! Be grounded when handling the unit! 1 Figure 2. Mounting plate (bottom view) with cable through hole (1) Duct mounting In principle, there is no difference in the procedure of duct mounting compared to the wall mounting case. However, in duct mounting it is essential to check out that there is no leakage from the room environment into the duct mounting box. The sealings of the box cover, as well as of the duct entrance, have to be checked! Choose an appropriate location in the return duct and follow the instructions that comes with the duct mounting box. Connect the cables and put the cover on. Do not forget to check also the sealing of the cable throughput! Figure VT for ductmounting. 2

3 Electrical Connections Terminal Function Maximum Electric Load Comments number Voltage Current 1 G+ Power supply (+) /AC VAC/+VDC 400 ma Internal rectifier diode (See note 1!) 2 GND System ground (-) Power supply (-)/AC 3 DIG 1 Trigger-input (See note 2!) 4 12VDC Output 12VDC 100 ma 5 GND System ground UART Special RS-232 connector is needed. 9 AN1 Analogue output (+) 0-10 VDC R out <100 ΟΗΜ (See note 3!) R load >5000 ΟΗΜ 10 mv (10 bits) resolution 10 GND System ground (-) 4-20 ma R load <500 ΟΗΜ via PTC fuse 16 ma (10 bits) resolution 11 AN2 Analogue output (+) 0-10 VDC R out <100 ΟΗΜ (See note 3 & 4!) R load >5000 ΟΗΜ 10 mv (10 bits) resolution 12 GND System ground (-) 4-20 ma R load <500 ΟΗΜ via PTC fuse 16 ma (10 bits) resolution Table I. Connections and terminal numberings for the 2001-VentoThermostat Note 1: The unit is based on a "3-wire" configuration; TB-1 & TB-2 for power and TB-9, TB-11 for analogue output signals. The ground terminal TB-2 is used as the negative DC power supply input or AC phase ground G0 (halfwave rectifier). The signal ground will coincide with that of the power supply, and only one transformer may be used for the entire system. Situations may occur where different transformers must be used for system power and signal evaluation unit! Note 2: It is recommended that any connected peripheral unit, i.e. IR motion sensors or manual pushbuttons, should normally be in closed Absence state connected to the ground, with the relay (or manual push button) opened in the Presence state, in which latter case a pull-up resistor in our system will guarantee a HIGH logic level that triggers the internal timer DT into the timer active state. The delay timer DT will be restarted every measurement cycle as long as a HIGH level (opened state) is detected on terminal pin #3. The programmable contribution of this digital input to the analogue output will therefore be active during the whole Presence time + the Delay time, the latter programmed by the user. Note 3: 2001VT can deliver both a 0-10 V voltage or a 4-20 ma current loop for AN1 and/or AN2. To change between 0-10 V and 4-20 ma, you use the hardware jumper but also have to change output range in the STRATEGY program. (If using only the jumper, you will receive 2-10 V and 0-20 ma, respectively). The D/A output error can be individually reduced to less than 1 % full scale using software offset and slope compensations. Note 4: Options 2001VT - R is equipped with a Relay added-on to AN2, N.O. or N.C., 1 ma / 5 V up to 1 A / 50 VAC / 24 VDC, for ON/OFF applications. 3

4 FUNCTION CONTROL for CO 2 & Temp IAQ sensor model 2001VT(-d-k) Visual control and function test, according to the text below, can easily be carried out by the installation engineer. The standard system have 3 different LEDs - green, yellow, red - that have different meanings in operation mode and service mode. These LEDs are located behind the semi transparent LCD (1). The purpose of these LEDs is to give access to status information even without any host computer nor PC connected. The LCD gives the same, but also complementary, information. Green - O.K LED - flashes after each successful measurement cycle. For display units, this also acts as LCD backlight, giving some degree of visibility also in darkness. Yellow - Call for Maintenance LED - emits in cases that the error information flag is set. If not a fatal system error (power regulators, memory failures) the green LED might still flash in parallel, indicating that one of the channels still may give correct results, or that only some analogue output stage has failed. An information code defining the problem is available on the LCD (if any) and, when a PC is connected, to the system serial port. Red - High Level Alarm LED - emits in cases when any of the two analogue outputs are saturated at 100% full scale, indicating that the regulating dynamic range is exceeded or, if so user programmed, a gas level threshold is reached. Push buttons There are up to 3 push buttons on the main PCB for manual interface, denoted (+), (-) and (disp.). During normal operation a simple push on any one of these buttons performs a harmless operation. The +/- buttons are intended for setpoint adjust applications, i.e. thermostat or ventostat with increase/ decrease functionality, but must be enabled via the serial port (PC and user interface software) for anything to happen. If enabled, LCD models will display the new setpoint offset value for a second as the sensor accepts the input. The display button is to switch over to another display mode, i.e. showing temperature instead of CO 2 concentration, or vice versa. 4

5 Function test If you take a breath of air and blow it right into the sensor (2) from a couple of decimeters distance, the controller will register a strong rise of the carbon dioxide level. If the controller is connected to a valve in a ventilation system the controller will signal an increase in air flow. You can check the analogue output, in terms of %, if the unit is equipped with a LCD (1). Press the lower button (DISP)on the unit. Single pressings (about one second) toggles between off, temp, CO2, alternating temp & CO2 and maintenance info. Info mode displays the sensor network address INA and the present analogue outputs AN1/AN2 in terms of % full scale. CO 2 - IAQ - sensor (2) (2) (1) (1) Regulator Duct mounting 2001VT(d) 2001VTk(d) Maintenance For checking the 2001VT sensor and the possible need for recalibration, you are referred to the maintenance kit art.no. UIP for 2001VT. Recommended time interval for zero check is five years, unless some extreme situation has occured. When checking the sensor, a PC is to be connected to the unit via a special RS232 cable that is included in the maintenance kit. This may be done on spot without interfering with the normal operation of the ventilation system. Note! Accuracy is defined at continuous operation (3 weeks minimum after installation) 5

6 Quick guide on Push-Button operations 1. Enter service mode: Press both + and - buttons at the same time until yellow & red LED turns on! 2. Step the menu: Press (+) & watch the red signal! upper button (+) - Menu selector - Single pressings increase the menu line by one step, as indicated by the red LED, and will exit service mode after the last menu line is passed. Display versions will announce OP x where x indicates the menu line number. op- #1-1 flash - full self diagnostic check op- #2-2 flashes - zero calibration of enabled channels (std = CO 2 ) op- #3-3 flashes - baseline calibration of enabled channels (i.e. 400 ppm CO 2 ) op- #4-4 flashes - AN1 fixed output mode op- #5-5 flashes - AN2 fixed output mode op- #6-6 flashes - network address reset 3. Enter your choice: press (-) to execute! middle button (-) - Activator - Continuous pressing during a period of about 3 seconds will activate the command on the menu line. The LEDs will start to light up just before the command is executed. 6

7 Self diagnostics The system features a full self diagnostic check procedure which is performed automatically after each power up. The same self diagnostic procedure can be initiated also on demand using the push button operation OP#1. During this procedure the analogue outputs will be set to 0% and 100% full scale for a couple of seconds, which then will activate any connected peripherals. This operation checks a number of crucial system functions and returns an error byte in the system RAM. When finished, if any error is found, a yellow LED will emit and the numerical LCD will indicate the error number xxx by displaying Exxx. This error status will not be reset until another self diagnostic procedure is performed, or when any push button is being pressed (for models delivered after October 1997). Bit #5 and bit #6, however, are checked and set or reset automatically every measurement cycle (two seconds). They are the result of a continuous test for sensor out of range and memory checksum error. Checks performed & error byte bit declaration: no bit set (00) No errors detected - all LEDs will turn off when the procedure is finished (the green LED will flash after each new measurement) bit # 0 (01) Input power low - the analogue 5 V regulator fails (ERROR is set low) bit # 1 (02) Analogue reference voltage error is not within the determined range bit # 2 (04) IR lamp power voltage regulator fails (ERROR is set low) bit # 3 (08) Analogue output AN1 hardware error detected. The output terminal is checked at level two levels (0 % and 100 % full scale) to assure that hardware is correct. An improper wiring or output load (even shortcuts) can be detected by this error code. bit # 4 (016) Analogue output AN2 hardware error detected (similar to bit # 3) bit # 5 (032) Sensor out of range (overload/underload). Data falls outside the dynamic range as detected by any of the calibration conversion tables. Indicates an exposure outside the specified sensor range, or a sensor failure. The latter case may eventually be solved by a re-calibration! bit # 6 (064) Memory checksum error. Data needed every measurement cycle is collected from EEPROM to the CPU twice using the internal system bus. If not the same value was collected, bit # 6 is set. bit # 7 (128) Not in use (reserved for future expansion) 7

8 LIMITED GUARANTEE This product has been accurately tested and examined for proper operation. Please operate this product only in accordance with the instructions. SenseAir AB warrants this product against defects in workmanship and material for a period of one year from date of purchase by the original owner. If th e product should become defective within this warranty period, SenseAir AB will repair or exchange it. Please contact your retailer for further information. The retailer is not responsible for any consequential loss or damages that may occur by reason of purchase and use of this product. The responsibility of SenseAir AB, in any event, is strictly limited to the replacement/ repair of the product. This product is in accordance with the EMC Directive 89/336/EEC and the Low Voltage Directive 73/23/EEC including amendments by the CE-marking Directive 93/68/EEC The product fulfils the follwing demands: EN , EN55011(B) EN , EN ,-3,-4,-5, Level3 (C) Copyright 1997, SenseAir AB 8