Bird Technologies ACMI User Manual

Page 33

Checking the Alarm at Pwr Up box will cause the units alarm indicators and
alarm relays to remain in an alarm condition from the time power is applied
until the unit begins making measurements. At that time, the relays and indica-
tors will return to their no-alarm condition until an event activates them.

VSWR Alarm Enable -

Check the VSWR Alarm Enable box to monitor the

VSWR reading and activate the alarm if the VSWR exceeds the Trip Point for
more than thirty seconds, is equal to or slightly greater than the Trip Point and
reverse power is increasing or immediatly if the VSWR is much greater than the
Trip Point.

VSWR Relay Energized on Alarm -

Checking this box will cause the VSWR

alarm relay to energize if the VSWR alarm is active and de-energize when the
alarm is not active. Un-checking this box will cause the VSWR alarm relay to de-
energize when the alarm is active and energize when it is not active. Unchecking
this box ensures a fail-safe alarm configuration.

This setting will determine which relay contact will be open and which will be
closed in the event of an alarm condition and influence the hard-wiring of the
VSWR relay contacts. Refer to the power/alarm connection instructions.

VSWR trip point -

Specify the VSWR value that will cause a VSWR alarm

(select values from the drop-down list). This value is adjustable from 1.3 to 2.5
by increments of 0.1. Check the VSWR Alarm Enabled on Zero Power checkbox
to allow the VSWR alarm to trigger at very low forward power (<

2.5% of full

scale power).

High Power Alarm (forward power only) -

Check the Enable box and spec-

ify the percentage of full scale at which an alarm will occur. The high power
value must be greater than the low power value. The maximum value is 125% of
full scale power. The alarm setpoint is entered as a percent of full scale. For
example, if you have a 500W full scale unit and would like an alarm when the
forward power exceeds 375 W, the alarm setpoint would be 375

/ 500 x 100 or

75%. Enter 75 in the field and check the Enable High Power Alarm checkbox.

Low Power Alarm (forward power only) -

Check the Enable box and spec-

ify the percentage of full scale at which an alarm will occur. The low power value
must be less than the high power value. The minimum is 0%.

Power Relay Energized on Alarm -

Checking this box will cause the Power

alarm relay to energize if the Power alarm is active and de-energize when the
alarm is not active. Un-checking this box will cause the Power alarm relay to
de-energize when the alarm is active and energize when it is not active.
Unchecking this box ensures a fail-safe alarm configuration.

This setting will determine which relay contact will be open and which will be
closed in the event of an alarm condition and influence the hard-wiring of the
Power relay contacts. Refer to the power/alarm connection instructions.

Trigger Alarm Button -

After you have set or made changes to alarm settings,

you can use the Trigger Alarm button to test the alarms (messages, relay, TTL out-
puts). If the Config password is enabled, you will be required to enter the password
before you can test the alarm settings.