Inspect the external chassis for physical damage, dents, or signs of overheating.
Apply non-conductive contact cleaner to the terminal blocks if oxidation or corrosion is visible. 4. Troubleshooting and Fault Diagnosis
Check the main input fuse; verify power outlet functionality. 5. Calibration and System Testing ps-855b maintenance manual
The PS-855B is a high-capacity variant within the PS-850/855 series, featuring lead-acid battery technology designed for harsh aeronautical environments. 28 VDC, 15 Amps maximum.
Most PS-855B units are rebranded by major industrial OEMs (e.g., TDK-Lambda, Mean Well, or Artesyn). Check these sources: Inspect the external chassis for physical damage, dents,
Verify that the steady-state DC voltage reads within the nominal tolerance zone (+/- 0.05V DC).
The PS-855B stands out in the series with its higher battery capacity (5.0 Ah, versus 2.5 Ah in other variants). It's designed for applications where a more robust power reserve is needed to support multiple emergency systems. Troubleshooting and Fault Diagnosis Check the main input
Select a location free from excessive vibration, moisture, and ambient temperatures exceeding the rating. Ensure the switch is accessible for maintenance.
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The L3Harris PS-855B maintenance manual covers a range of essential tasks. Here's a breakdown of the most critical procedures you can expect to find.
Spin cooling fans manually while the unit is off. If you feel resistance or hear a grinding sound, replace the fan assembly immediately. 4. Troubleshooting and Fault Resolution