ADCP-80-526 • Issue 6 • December 2006

5.3Connection Polarity Test

Use the following procedure to check that the power input wires are connected for correct polarity:

1.Verify that the input power cables are connected to the correct terminals.

2.Verify that the circuit breakers for all circuits are on.

3.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.

4.If the voltage is much higher, and reads out in the –30 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.

5.If the problem is such that you can’t figure it out with these instructions, consult with ADC Technical Assistance Center (TAC).

5.4GMT, TPA Fuse Alarm Test

Place a fuse that has failed in one of the fuse positions on each bus. The visual fuse alarm LED(s) will change from unlit to lit (red light), and the fuse alarm relay will operate. Replace the failed fuses with known good fuses.

5.5KLM Fuse Alarm Test

Perform the following tests:

Note: The KLM fuse positions require a load connected to the corresponding outputs to light the fuse alarm indicators.

1.With the fuse platform powered, no load on the outputs, and no KLM fuses installed, verify that no fuse alarm LED is lit (no red light). Verify that the fuse alarm relay indicates an open circuit between the NO contact and the C contact at the fuse alarm contacts.

2.Connect a 10 kohm, ½ watt resistor between each KLM fuse output (labeled BATT) and return (labeled RTN). Verify that each KLM fuse alarm LED lights (red light) when the corresponding load is connected. Verify that the fuse alarm relay indicates a short circuit between the NO contact and the C contact at the fuse alarm contacts.

3.Insert a known good KLM fuse in each fuse position, one at a time, and verify that the corresponding fuse alarm LED is off.

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© 2006, ADC Telecommunications, Inc.