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Case 2: EPS90 Testing

Q: How to Test EPS90 sub-rack.

A:

Step1:Install PMU and PSU, Connect AC input, disconnect battery, Disconnect

Load1 and Load2, Put off Power switch ofthe battery;

Measure the Voltage between BAT.(+) and BAT.(-), voltage between RTN(+)

and Load1(-), Voltage between RTN(+) and Load2(-). All of the voltage should

be about 53.5V.

Step2: Uninstall (take off, hot plug) PMU;Measure the Voltage between BAT.(+) and BAT.(-), it should be 0V;

Measure the Voltage between RTN(+) and Load1(-), it should be 53.5V.

Measure the Voltage between RTN(+) and Load2(-). it should be 53.5V.

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Step3:Install PMU, Put on Power switch ofthe battery;

Use one cable to short circuit BAT.(-) and LOAD2(-), the voice ofcontactor be put on should be heard.

Step4: Remove the short circuit cable;

Measure the Voltage between BAT.(+) and BAT.(-), it should be 53.5V.

Step5:Uninstall (take off, hot plug) PMU;Measure the Voltage between BAT.(+) and BAT.(-), it should be 53.5V.

If all results as same as the up-step, the EPS90 sub-rack is working

normally.