The AC890's DC bus voltage is extremely high on power-up. Why?

SEE THE ADJACENT FAQ IF YOU HAVE AN 890PX INSTEAD.

1. This can mean the Y-caps are creating a voltage multiplier.
   1. This can be a result of the AC890 being used as an AFE (Active Front End).
      (Typically when drives are going to be used in an AFE Application they are ordered with the 007 option)
   2. This can occur if the drive is connected to a transformer with "Open-Delta" or "Corner-Grounded Delta" windings.
2. The Y-Caps can be disconnected.
   1. General modification notes on the removal of links:
      1. Remove the component/link by desoldering or by cutting it back to the board at both ends, close to the printed circuit board, so that arcing cannot occur.
      2. Disconnect the Y capacitors from DC+ and DC- to earth.
         (The location of the jumpers/resistors to be removed varies for each frame size)
      3. Contact Parker Applications for additional information on a drive-by-drive basis

Warning:
Removal of the 'Y' capacitors invalidates conformance to the EMC standards stated on the Declaration of Conformity in the product manual. The CE mark remains on the product as this is for product electrical safety.
B-D frames = software
E-K frames = same as 690+

• [QuickLink for the 890 on Parker.com] - Manual, QuickStarts, Product Support, etc

9NOV2016 LS