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System Checkout
Refer to NFPA for guidelines on testing signaling systems.
When rated input voltage is applied to the AVL-1, the unit initializes its program and broadcasts a tone signal through each output
channel for several seconds. The green system normal LED indicator should be on to indicate normal operation. If the amber
system trouble LED is on, a trouble condition is indicated. Refer to the "Troubleshooting and Servicing" section to diagnose and
correct the trouble condition.
The system checkout should include:
1. Testing all inputs and outputs.
2. Testing all connections to equipment that is interconnected with the AVL-1.
3. Testing all message files for proper audibility, intelligibility, content and priority.
If a malfunction is discovered during testing, the problem should be corrected immediately before continuing with testing.
WARNING: ALL PROTECTIVE SIGNALING SYSTEMS REQUIRE PERIODIC TESTING. ALL PROTECTIVE SIGNALING
SYSTEM EQUIPMENT SHALL BE TESTED BY QUALIFIED PERSONNEL AT LEAST TWICE A YEAR FOR PROPER
OPERATION, OR MORE OFTEN IF REQUIRED BY CODES, REGULATIONS AND LAWS. FAILURE TO MAINTAIN AND TEST
PROTECTIVE SIGNALING SYSTEM EQUIPMENT CAN RESULT IN NOT DETECTING EQUIPMENT FAILURE THAT CAN
CAUSE PROPERTY DAMAGE AND SERIOUS PERSONAL INJURY OR DEATH TO YOU AND/OR OTHERS DURING AN
EMERGENCY SITUATION.
Ground Fault Detection Sensitivity Adjustment
The resistance at which a ground fault will be detectable is adjustable. The AVL-1 ground fault detection sensitivity can be adjusted
between 40K and 500K Ohms. Selecting a high sensitivity (high resistance) will have a fast response to ground fault conditions,
but may also cause a high number of false trouble conditions. Selecting a low sensitivity (low resistance) will greatly reduce the
susceptibility to false trouble conditions, but will slow the response to ground fault conditions.
Before the following adjustment procedure is performed, all trouble conditions must be corrected (cleared) and the "GROUND
FAULT ENABLE ("EN")/DISABLE ("DIS") jumper placed in the enable position.
NOTE: The ground fault detection sensitivity setpoint must be approved by the authorities having jurisdiction.
Adjustment Procedure
1.
Disconnect the wire between the earth ground terminal on the printed circuit board (see Figure 8) and earth ground.
2.
Rotate the shaft of the Ground Fault Detection Sensitivity potentiometer (R123) fully counter clockwise (See Figure 8). The
potentiometer is a twelve turn device, so the shaft will probably have to be rotated a number of times. The potentiometer will
make a clicking sound as it is rotated past its end point.
3.
Place a resistor with the desired setpoint value between the positive side of the input voltage and the earth ground terminal on
the printed circuit board.
4.
Slowly rotate the shaft of the Ground Fault Detection Sensitivity potentiometer clockwise. When a ground fault is indicated by
the trouble LED's, the sensitivity setpoint is set correctly.
5.
Disconnect the resistor used to set the sensitivity level.
6.
Reconnect the wire between the earth ground terminal on the printed circuit board and earth ground.
AVL-1 Manual
Rev. H August 2000
www.PDF-Zoo.com
firealarmresources.com
Sheet 31 of 41
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