Manual

8
Alarm Response
When an alarm is triggered, the Bird Broadcast Power Monitor turns on the
alarm LEDs, provides a TTL alarm out signal (low = alarm), and deactivates a
form-C dry contact relay. Additionally the BPM-E can latch the alarm condition
and notify up to two persons via email if you have set up this option in the
WebTool software.
Note: The alarm relay defaults to fail safe. That is, the relay is de-
energized when an alarm activates or when power is lost. If you need
to have an alarm relay that energizes on an alarm, contact Bird (see
title page of this manual).
Alarm Reset
After an alarm occurs, you can reset it in the following ways:
• Press the reset switch on the BPM-E or on the digital display.
• Apply a TTL logic low signal (0 to 0.8 Vdc) to the reset pin on the Power/
Alarm connector.
• Use the PCTool software to reset the unit through the RS-232 port.
• Use the WebTool software to reset the unit through the ethernet port.
Alarm Latching
The alarm defaults to latching operation. In this mode, the alarm will stay active
until reset. In non-latching mode, the alarm will reset automatically about forty
seconds after the trigger condition is corrected. The latching mode can be
changed using the PCTool or the WebTool.
VSWR Alarm
Activating the VSWR also enables all other alarms that have been selected. Con-
versely, deactivating the VSWR alarm disables all other alarms that have been
selected.
The BPM-E continuously monitors forward and reflected power. From the power
measurements, the VSWR is calculated and compared to the allowed maximum
(default of 1.8 to 1). Based on the results of the comparison, possible actions
include:
• No alarms are activated if the VSWR is less than the maximum, or if the
VSWR alarm is disabled.