Rockwell-automation SB3000 Configuration and Programming Uživatelský manuál stáhnout pdf (Strana 113)

Discharging the DC Bus

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PPENDIX

Discharging the DC Bus

Observe the following precautions to safely discharge the SB3000 Rectifier’s DC bus

capacitors before performing any service or maintenance on the rectifier. Refer to

instruction manual S-30xx, Distributed Power System High Power SB3000 Power

Modules, for information regarding test points, component locations, and

troubleshooting and maintenance procedures.

•

Disconnect, lock out, and tag three-phase AC input power.

•

Wait five minutes to allow the DC bus voltage to dissipate.

•

Look at the built-in DC Bus voltmeter. When the DC bus potential is down to

approximately zero volts, open the Power Module cabinet doors and measure the

DC bus potential across the DC bus bars, 1247 A (+ bus) and 1145A (- bus), with an

external voltmeter before working on the unit.

ATTENTION:DC bus capacitors retain hazardous voltages after input

power has been disconnected. After disconnecting input power, wait ten

(10) minutes for the DC bus capacitors to discharge. Open the cabinet

doors and check the voltage across the DC bus bars, 347 A,B,C (+ bus)

and 345 A,B,C (- bus), with an external voltmeter to ensure the DC bus

capacitors are discharged before touching any internal components.

Failure to observe this precaution could result in severe bodily injury or

loss of life.

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Rockwell-automation SB3000 Configuration and Programming Uživatelský manuál Strana 113