MMCR18 Media Converter Chassis Installation Guide
18
Alarm Out Connector on the Fan Unit
The MMCR18FAN unit is equipped with the 2-pin Alarm Out connector,
which can be connected to an external alert device. You can use this
external device to alert you a fan failure. Here are two examples of alert
devices for the Alarm Out connector:
Strobe light
Buzzer
Note
Alert devices are not available from Allied Telesis.
The Fan unit does not supply power on the Alarm Out circuit. Instead, the
circuit is an on or off dry contact relay. When an alarm condition occurs,
the Fan unit changes the circuit from close (on) to open (off). The circuit
remains open until the alarm is resolved, at which point the Fan unit
automatically closes it again. The processes to resolving alarms can vary.
The external alert device must provide the necessary power for the circuit
and be able to monitor the circuit for when it is closed or open.
The minimum switching load of the contacts is 10mVDC, 10uA.
Note
Perform confirmation testing with the actual load since reference
values may vary according to switching frequencies, environmental
conditions, and expected reliability levels.
For maximum contact ratings, see “Relay Contact Ratings (Alarm Out
Connector on the Fan Unit)” on page 47.
Figure 6 shows an Alarm Out connector configuration example.
Figure 6. Example of Alarm Out Usage on the Fan Unit
To Next Page
Loading...
Need help?
General