Alarm Relay Contacts, LEDs, and Cutoff Button

At the far left side of the craft interface are two relay contacts for connecting the router to external alarm-reporting devices. The upper set is activated by a system red alarm and the lower set by a system yellow alarm. For instructions for attaching a device to the alarm relay contacts, see Connecting to an External Alarm-Reporting Device.

Immediately to the right of the alarm relay contacts are the two large alarm LEDs. The circular red LED lights to indicate a critical condition that can result in a system shutdown. The triangular yellow LED lights to indicate a less severe condition that requires monitoring or maintenance. Both LEDs can be lit simultaneously.

To deactivate red and yellow alarms, press the button labeled ACO/LT (for “alarm cutoff/lamp test”), which is located to the right of the alarm LEDs. Deactivating an alarm turns off both LEDs and deactivates the device attached to the corresponding alarm relay contact, but does not correct the problem that caused the alarm.

Table 12 describes the alarm LEDs and alarm cutoff button in more detail.

Table 12: Alarm LEDs and Alarm Cutoff/Lamp Test Button