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ADCP-80-575 • Issue 2 • December 2006
Page 27
© 2006, ADC Telecommunications, Inc.
6. Using a multimeter set to measure DC voltage, measure the voltage between each input
power (RTN) terminal and chassis ground. The voltage level should be less than 2.0 Vdc.
7. If the voltage is much higher, and reads out in the –21 to –60 Vdc range, the input leads are
probably reversed. If this appears to be true, power down the panel. Disconnect the
negative (BATT) and positive (RTN) input lugs and switch them around. Power up the
panel and check again to verify that the higher voltage is on the negative (BATT) lug.
8. If the problem is such that you can’t figure it out with these instructions, consult with ADC
Technical Assistance Center (TAC).
5.3 GMT Fuse Alarm Test and Installation
If the fuse platform being installed is equipped for GMT fuses, use the following procedure to
test or install a GMT fuse. Fuse platforms equipped for GMT fuses are shipped with dummy
fuses in the GMT fuse holders.
To test the fuse alarm indicator for the GMT fuses, replace a dummy fuse with a known failed
fuse. The visual fuse alarm LED for that bank of fuses will change from unlit to lit (red light),
and the fuse alarm relay will operate. After testing, remove the failed fuse and install a dummy
fuse in any fuse position that will not be used.
To install a fuse, replace the dummy fuse with a good fuse.
5.4 TPA Fuse Alarm Test and Installation
If the fuse platform being installed is equipped for TPA fuses, use the following procedure to
test or install a TPA fuse. Fuse platforms equipped for TPA fuses are shipped with no fuses
installed in the TPA fuse positions.
To test a TPA fuse alarm indicator, install a known failed fuse in the position of interest. Verify
that the fuse alarm LED is lit (red light). Verify that the fuse alarm relay indicates a closed
circuit between the NO contact and the C contact at the fuse alarm contacts. After testing,
remove the failed fuse.
To install a TPA fuse, insert the fuse in the selected position. Verify that the visual fuse alarm
indicator for that fuse is unlit.
5.5 KLM Fuse Alarm Test and Installation
If the fuse platform being installed is equipped for KLM fuses, use the following procedure to
test or install a KLM fuse. Fuse platforms equipped for KLM fuses are shipped with no fuses
installed in the KLM fuse positions.
Note: The KLM fuse alarm LED has two color states, red and green.