Technical Information; General; Display Board - Dräger Regard 3900 Instructions For Use Manual

Regard 3900 series sixteen channel controller
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Technical information

4
Technical information
WARNING
!
This section and all subsequent sections contain technical and set-up information for trained maintenance technicians.
The procedures should not be attempted by untrained personnel as it could make the controller or gas detection system
unsafe for use.
4.1

General

The controller has a display board and up to six control modules. The control modules are a combination of input modules,
relay modules and output modules, which is flexible within the limitations of the controller. Internally, all control modules and the
display board are connected together using a ribbon cable.
The controller can be supplied from an AC or DC source or both, and irrespective of the power supply to the controller the internal
control modules receive a 24 Vdc supply. The following internal LEDs operate during use:
● A green LED on each of the control modules illuminates to indicate that the internal DC voltage is supplied.
● Two red LEDs on the right-hand side of the display board and each of the control modules flicker during normal operation.
● A red LED next to each relay on an input module or relay module illuminates when the relay is energized.
Display board
4.2
The display board is fitted inside the controller, and houses the display screen and the LEDs that are visible on the front panel.
The display screen and LEDs provide information and warnings in response to the conditions measured at the remote sensor
transmitters. Also on the display board are the inhibit switch and the contrast control.
Inhibit switch
4.2.1
The inhibit switch is used during maintenance or repair of the controller to hold the controller relays in their current state, and
thereby prevent activation of the gas-level warnings. The inhibit switch operates as follows:
Position
Effect
0
All relays operate normally
Relays configured as "alarms inhibited" energize (associated remote warning devices activate).
1
All other relays are held in their current state.
The Inhibit / LED illuminates.
The Active /
Output module signals freeze at their current level.
WARNING
!
Setting the inhibit switch to position 1 holds the controller relays in their current state and prevents activation of gas-level
warnings. Always return the switch to position 0 after the maintenance or repair task.
4.2.2
Contrast control
The display screen contrast can be adjusted using the contrast
control. When required, use a suitable screwdriver to turn
the control to adjust the contrast. Note that LCD screens are
affected by temperature and adjustment may be required to
suit very cold or very hot environments.
10
LEDs blink off and the internal sounder beeps every 30 seconds.
3801
Regard 3900 Series

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