Bird Technologies 3128A - Manual (Page 23)

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Chapter 4 Operating Instructions
General
This section contains information about the various operating modes and features of the Wattcher RF Monitor/Alarm.
Zero Adjust
The two panel meters should be checked for zero set under no power conditions. With no power applied the meter
pointers should set exactly on zero. If adjustment is required, turn the adjustment screw until the pointer is set at zero.
Figure 6 Zero Adjust
Alarm Enable/Disable
The audible alarm will be enabled when the push-button is not depressed, and disabled when it is depressed.
Fail-Safe / Non Fail-Safe Mode
Non fail-safe mode is selected when the push-button is not depressed, and fail-safe is selected when it is depressed.
Non fail-safe mode—An interlock active condition is caused only by exceeding reflected power trip value. Fail-safe
mode—An interlock active condition can be caused by exceeding reflected power trip value or if the Wattcher Unit is
not operating.
Adjusting Reflected Power Trip Level
Ensure that the plug-in elements in the line section of transmission line are properly positioned and directed. Make
sure that the fail-safe/non fail-safe switch is in the desired mode.
While depressing the view push-button, rotate alarm level adjust screw until the pointer indicates the desired trip
level.
Connecting the Interlock
There are two sets of interlocks provided. Wire the interlocks based on transmitter requirements. During an alarm
condition the interlocks become active. An active interlock—in the non-fail safe mode—causes the normally closed
terminals to open and the normally open terminals to close. Connection to the interlocks is achieved through a six-
terminal Screw-Clamp plug connector.
Note: The opposite is true for fail safe mode.