Distech Controls GS-CDR02K Manuale di installazione dell'hardware - Pagina 5

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Normal Mode

The sensor will begin reading the CO

on the LCD. If the relay is installed, the measurements will be compared to the setpoint and appropriate action taken. The keypad is

monitored and if the <MENU> key is pressed the device will enter the Setup Menu. If the setpoint option is installed, then pressing

either the <UP> or <DOWN> keys will cause the device to enter the setpoint mode. The Setup Menu can be accessed to configure

the device for required operation.

Relay Mode

The optional relay can be used as an alarm signal to indicate that a setpoint has been exceeded. For the basic CO

may be configured via the Setup Menu as a high or low alarm and the setpoint value, hysteresis and on-delay time may be set. The

relay will activate and close the contacts if the CO

a low alarm). If required, this action can be delayed by a time period (relay delay time) to prevent false alarms. After the relay is

activated, the measurement must fall below the setpoint - hysteresis value (for a high alarm) or go above the setpoint + hysteresis

value (for a low alarm) to deactivate the relay and open the contacts. The high/low assignment, setpoint, delay time and hysteresis

values may all be programmed via the Setup Menu as required.

If the optional temperature sensor is installed, the relay operation may be assigned to operate as a temperature high or low alarm

instead of a CO

alarm. All the same relay parameters may be configured to set up the alarm as required.

Setpoint Mode

The optional setpoint control is operated by two front panel switches for <UP> and <DOWN> and the resistive output signal simulates

a slidepot action with + and - 10 steps from the midpoint. For example, if the device is ordered with a 0-10KΩ resistance value, then

the resistive output midpoint is 5KΩ and each press of the <UP> key will increase the output resistance by 500Ω up to 10KΩ and each

press of the <DOWN> key will decrease the output resistance down to 0Ω. There are several optional "slidepot" values available for

the product such as 20-30KΩ, 475-10,475Ω, etc and each range may be set as direct or reverse acting via the Setup Menu.

When either the <UP> or <DOWN> keys are pressed, the LCD temporarily changes to display the temperature setpoint value in °C

or °F as set by Temp Units in the Setup Menu. The display will show the previous temperature setpoint setting such as 22 ºC or 77

ºF. If no other action is taken for 5 seconds then the device will reset to normal operation. While the display is still flashing the setpoint

can be modified by pressing the <UP> or <DOWN> keys to increase or decrease the setpoint value. The LCD will update to show the

new setpoint and the output signal will update accordingly. When the desired setpoint is shown on the LCD, leave the unit for 5

seconds to reset to normal operation and save the new setting. As the setpoint is changed the SETPNT output signal will change in

resistance. The display midpoint and step resolution can both be programmed using the Setup Menu.

User Menu

The device has several parameters that can be configured locally via the Setup menu using the keypad and LCD. Any changes made

are saved in non-volatile memory and are restored in case of a power loss. The menu can be accessed at any time after the start-up

mode and if there is 5 minutes of inactivity the menu will close and normal operation will continue.

To enter the menu, press and release the <MENU> key. This will enter the Setup Menu step 1, pressing the <MENU> key a second

time saves the setting and advances to step 2. Each press of the <MENU> key saves the current setting and advances the menu

item. The <UP> and <DOWN> keys are used to make changes to program variables by scrolling through the available options. The

first column below shows what will be displayed on the LCD, including the default value.

<MENU>

CO2 Span

2000 ppm

<MENU>

Self-Cal

<MENU>

Altitude

0 m

5/9

level (and temperature if it is installed), output the correct analog signal and display the values

measurement goes above the setpoint (for a high alarm) or below the setpoint (for

Press and release to enter the SETUP menu

The CO

Span value controls the analog output scaling. CO

10,000 ppm in 500 ppm increments using <UP> or <DOWN>. If CO

output signal is scaled 0-2000 ppm = 4-20 mA. Factory default is 2000 ppm.

Press to advance to next menu item.

The Self-Cal feature <MENU> when enabled requires the sensor to be exposed to fresh air for at

least one hour every twenty-four hours. When first installed the sensor requires a minimum of seven

days of operation with fresh air exposer daily to allow the algorithm to adjust for self-calibration.

Default for device is having this feature disabled enabled "ON". If disabling this feature a manual

calibration should be performed to ensure accuracy of the device.

Press to advance to next menu item.

The Altitude value allows CO

the highest CO

accuracy. Altitude can be changed from 0 to 2550 meters in 50 meter steps using

<UP> or <DOWN>. It will take a few moments to change the setting, then the menu will advance to

the next step. Factory default is 0 m (sea level).

compensation for local atmospheric pressure and altitude and ensures

product, the relay

span can be changed from 1000 to

Span = 2000 ppm, then the