Troubleshooting Blown Fuses and Capacitor Cells
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How To Check Blown Fuses And Capacitor Cells

In Fixed Power Factor Correction Capacitors PDF Version

Trouble: Fuse light is illuminated.
  1. This indicates that a fuse is blown. Power surges or harmonics are two common causes of fuse failure.
  2. Disconnect power from the capacitor unit and wait one minute after the power has been disconnected to allow capacitors to discharge.
  3. Check affected capacitor following steps below: How to Test a Capacitor Cell
  4. Replace affected fuse.

Trouble: Amber light is illuminated in KIM model PFCC

  1. This may indicate that a fuse is blown or the capacitor has lost capacitance.
  2. Check amperage draw of capacitor unit while it is connected to power based on following table. If the amperage is low complete the next three steps.
  3.  
    Applied Voltage
    208V
    240V
    480V
    600V
    Amps / kVAr
    2.78
    2.41
    1.20
    0.96
     
  4. Disconnect power from the capacitor unit and wait one minute after the power has been disconnected to allow the capacitors to discharge.
  5. Check the fuses using an ohmmeter. Replace any blown fuses.
  6. Check the capacitors following steps found in steps below: How to Test a Capacitor Cell
  7. Replace bad capacitor cells.

How to Test a Capacitor Cell:

With a Capacitance Meter
Capacitor cells are rated in microfarad and voltage. The easiest way to test a cell is to measure the microfarads with a capacitance meter.

  1. Disconnect power from the capacitor unit and wait one minute after the power has been disconnected to allow the capacitors to discharge.
  2. Measure microfarads using capacitance meter. The microfarads should be equal to the microfarad rating or up to 5% over the rating. This microfarad table may be used as a reference.
  3. If microfarads are below the minimum, the cell is going bad.
  4. Replace bad capacitor cells.

Visual Inspection of Cell
If a capacitor meter is not readily available, the status of a cell can sometimes be determined visually.

  1. If the cell can is "bulged out" or "pouched up" on the top, it is definitely bad.
  2. Disconnect power from the capacitor unit and wait one minute after the power has been disconnected to allow the capacitors to discharge.
  3. Replace bad capacitor cells.

MYRON ZUCKER INC. products are designed to:

  • Improve power factor
  • Eliminate utility penalties or surcharges
  • Increase available distribution capacity
  • Mitigate harmonic distortion
  • Protect sensitive equipment
  • Decrease downtime
  • Reduce line losses and associated cost
  • Comply with industry standards

CONTACT US

Myron Zucker, Inc.
36825 Metro Court
Sterling Heights, MI 48312
Toll Free: 800.245.0583
Phone: 586.979.9955
Fax: 586.979.9484
Email: info@myronzucker.com