DEIF SCM4.1 interface module

Power Supply Connections The input ac power supply is connected via a three core cable at the rear of each unit. The nominal 24V dc output supply is connected via a twin core cable at the rear of each unit.Matching blank front panels are available for fitting to the rack in all unused single channel control card spaces.The 5701 Series Control System is equipped to provide the operational and engineering facilities necessary to fully maintain a system of gas detection equipment. Each control card within a rack system displays a sensor reading, alarm status and condition of that channel. Further information can be gathered and, depending on the security status, certain settings can be adjusted by means of an Engineering Card fitted to the rack.

The relay outputs of the system

 are configured to provide a range of output alarm functions as follows: a. Fault Alarm The fault alarm activates when a fault is detected in the control card or associated sensor and is not user configurable. In addition the FAULT LED will be illuminated. b. Inhibit Alarm The inhibit alarm activates when the system alarms are inhibited for any reason and is not user configurable. In addition the INHIBIT LED will be illuminated. c. A1, A2 and A3 Level Alarms The A1, A2 and A3 level alarms are activated when the level of gas being measured crosses the preconfigured alarm threshold. In addition the relevant LED will be illuminated. d. STEL Alarm (Short Term Exposure Limit)

The STEL alarm will be activated

 when the time weighted average concentration of a toxic gas, usually averaged over 10, 15 or 30 minutes, crosses a preconfigured threshold. When active STEL will be shown on the message display of the control card. For certain relay cards and configurations, the alarm LED associated during setup to the STEL alarm will be illuminated LTEL Alarm (Long Term Exposure Limit). The LTEL alarm will be activated when the time weighted average concentration of a toxic gas, usually averaged over 8 hours, crosses a preconfigured threshold. When active LTEL will be shown on the message display of the control card. For certain relay cards and configurations, the alarm LED associated during setup to the LTEL alarm will be illuminated. f. Rate Alarm (Version 2Vx Software only)

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