Alpha Power Supply Module Test - Regular Voltage

To make an Alpha Power Supply Module (regular voltage) come up with “- -“ on the display and 300 volts DC output across the buss:

Kill power, let the charge lights go out, then check for a DIRECT SHORT between the top and bottom buss bars.

If you have a DIRECT SHORT, disconnect modules until the short goes away.

If you do not have a DIRECT SHORT, follow the steps below.

Be sure to measure the leg-to-leg AND leg-to -ground voltage into the power supply module.

If you do not have a DIRECT SHORT:

Supply 3- phase input into L1, L2 and L3 bottom of power supply (200-220V AC leg-to-leg & 100-110V AC leg-to-ground)

Supply 200 volts input into CX1A connector.

Jumper out the top and bottom pins of the three pins on the CX3/MCC cable coming into the PSM.

Jumper out the top two pins of the three pins on the CX4/ESP E-Stop connector on the PSM.

Have all screws on the DC buss installed and tight.

With these things done you should have “- -“ on the display and 300 volts DC across the buss. If you do not, then replace power supply.

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