Remove Power from the System for Frames 7...15

This procedure must be completed before attempting to service any part of a frame 7…15  drive or bus supply.
ATTENTION:
Risk of injury or equipment damage exists.
Remove power before you remove or make cable connections. When you remove or insert a cable connector with power applied, an electric arc can occur. An electric arc can cause personal injury or property damage in the following ways:
  • An electric arc can send an erroneous signal to system field devices, which can cause unintended machine motion
  • An electric arc can cause an explosion in a hazardous environment
Electric arcs cause excessive wear to contacts on both the module and its receiving connector. Worn contacts can create electrical resistance.
Follow these steps to remove power from a frame 7…15 drive or bus supply.
  1. Turn off and lock out all input power, including any external power sources (such as an Active Front End or other DC power source).
  2. ATTENTION:
    Risk of injury or death exists.
    To avoid an electric shock hazard when servicing the product, a means for Lockout/Tagout of the external power supply source, must be provided.
  3. If present, turn off and lock out any external, single-phase 120/240V power source.
  4. For regenerative drives and bus supplies, complete these steps:
    1. On the input bay, turn the AC precharge disconnect switch to the “Off” position.
    2. Wait 15 minutes.
    3. Open the enclosure door.
    4. Close and lock the hasp on the circuit breaker.
    5. Lock the fused disconnect switch.
    6. Verify that there is no voltage at the drive or bus supply input-power terminals.
  5. For common bus inverters with DC precharge, complete these steps.
    1. Complete the tasks in step 3 for the bus supply AC input source.
    2. Turn the DC precharge disconnect switch to the “Off” position.
    3. Wait 15 minutes.
    4. Open the enclosure door.
    5. Close and lock the hasp on the circuit breaker
    6. Lock the fused disconnect switch.
    7. If a control bay is used, turn the selector switch to the “Off” position and lock the switch.
  6. IMPORTANT: Do not use testpoints to verify that incoming power has been removed from the product. Access testpoints only after incoming power has been removed and the input power system is locked and tagged out.
  7. For applicable products, open the protective caps on the testpoints.
  8. For regenerative drives and bus supplies, measure the AC input and DC bus voltage at the following testpoint sockets in the input bay to verify that there is no voltage present and all components have discharged:
    • Using the circuit breaker output (CB1 SEC) testpoints R/L1, S/L2, and T/L3, measure L to L and L to chassis GND.
    • By using the fused disconnect output (FD1 SEC) testpoints R, S, and T, measure L to L and L to chassis GND.
    • By using the DC bus testpoints +DC and –DC, measure +DC to –DC, +DC to chassis GND, and –DC to chassis GND.
  9. input bay testpoints location example
  10. For common bus inverters, by using the DC bus testpoints +DC and –DC on the front of the power modules, measure the DC bus voltage of all power modules and verify that there is no voltage present on the bus capacitors. Measure +DC to –DC, +DC to chassis GND, and –DC to chassis GND.
    frame 8…15 power module DC testpoints location
  11. IMPORTANT: When you have completed your measurements, replace the protective caps on the testpoints.
  12. Measure the 240V AC control voltage at the appropriate terminals:
    • For frame 7 drives and bus supplies, measure terminals L and N on terminal block TB3.
      frame 7 terminal block TB3 240V AC control power terminals location
    • For frames 8…15 drives and bus supplies, in the input bay, measure terminals L and N on terminal block TB2.
      frame 10 input bay terminal block TB2 240C AV control power terminals location
    • For control bays, measure terminal L at FH2-2 and terminal N at terminal block TB4.
      control bay terminal block TB4 240V AC control power terminals location
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