Detcon RD-8X - Manual (Page 8)

RD-8X-N4X Operators Manual
3.2.4 Relay Outputs
The Model RD-8X provides four single pole double throw (SPDT) Form C contact relays. The relay
terminals (P6 through P9) are labeled “FAULT”, “ALM3”, “ALM2”, and “ALM1” (refer to Figure 3). The
relays can be used to control annunciating devices or as signal input/outputs to other control devices.
Connections are labeled COM (common), NO (normally open) and NC (normally closed). The current
ratings of the relay contacts are 5A @ 30VDC, and 5A @ 250VAC, these ratings should not be exceeded.
Note: ALM3 is not used when the unit is used with the 10B control units.
3.3 Start-up
The power switch is located on the outside of the enclosure, on the right side of the unit, and is marked as
“ON” and “OFF”. To apply power to the unit, turn the switch to the “ON” position.
NOTE: Before applying power, check to make sure that all the wiring connections and external
devices are installed correctly.
NOTE: Applying power with devices hooked up incorrectly may cause damage to the equipment.
When power is applied to the unit, the unit will display the firmware revision and properties for several
seconds. For this controller that information should be:
DETCON
INC COM 1 MODBUS SLAVE
MODBUS CONTROLLER
VERSION XX.XXX COM 2 MODBUS MASTER
PCWH X.XXX
After unit initialization, the unit will begin normal operation. If the unit has been properly setup, the unit
will display the current status of the devices that it is connected to.
4. System Operation
4.1 Front Panel
The Main Display is a 1¼”x 6” backlit LCD that has 4 lines by 40 characters. In normal operation the
channel’s information will be shown as “01> XXXX ppm GAS” will be displayed. If any channel is in
any gas alarm condition, “01> XXXX IN ALARM ” will be displayed. If any gas channels are in Fault,
they will display “01> XXXX IN FAULT ”. If any channels are not communicating with their
appropriate 12B controller, then they will display as “01> XXXX COMM ERROR ”.
Four LED indicators on the front panel show alarm and fault relay status. The LED’s represent ALM 1
(yellow), ALM 2 (amber), ALM 3 (red) and FAULT (blue) and are labeled respectively.
The RD-8X user interface consists of four function keys on the front panel. These keys are labeled:
“PROG”, “u” (Up Arrow), “v” (Down Arrow), and “ENTER”. The “ENTER” key doubles as a
“RESET/ACK” key, but “RESET/ACK” has no functionality in this firmware revision.
NOTE: The Remote Display automatically times out of Menu Mode and returns to the Main
Display after 15 seconds of inactivity. While in Menu Mode, there are no updates to gas readings.
Model RD-8X-N4X Operator Manual Rev. 1.0 Page 4 of 14