Yokogawa PW484-50 S1 DCS Power Supply Module

• Brand
  Yokogawa
• Model
  PW484-50 S1
• Product Name
  DCS Power Supply Module
• Place of Origin
  Japan
• HS Code
  8537.10.90
• Dimensions
  49.7 mm × 130 mm × 146.5 mm
• Weight
  1.0 kg
• Operating Temperature
  −20 °C to +70 °C
• Storage Temperature
  −40 °C to +85 °C
• Power Supply
  24 V DC
• Warranty
  1year
• Product Status
  new and original

Yokogawa PW484-50 S1

Voltage：

Input supply voltage:
24VDC ±10% DC input；
provides regulated 5VDC backplane bus voltage for FIO rack I/O modules；
built-in over-voltage protection function；
isolation voltage between input power and internal circuit.

Current：

Max input current:
5.5A@24VDC；
output current for FIO backplane 5VDC bus；

integrated over-current, short-circuit and thermal protection；

supports 1+1 redundant parallel current sharing for non-stop power supply.

Yokogawa PW484-50 S1 Troubleshooting: Unstable Voltage and Current

Fluctuating external 24VDC input results in unstable 5VDC backplane voltage and current output from PW484-50 S1

  Root cause: Fluctuation of external 24VDC power source; loose input power terminals; reversed input power polarity; excessive ripple on input power supply.

 Action: Measure external 24VDC power source and ensure it stays within 24VDC ±10% tolerance; retighten input power terminals; validate correct positive-negative polarity; install DC power filter when ripple exceeds technical specifications.

Total FIO rack load exceeds the rated output capability of PW484-50 S1

  Root cause: Excessive quantity of I/O modules powered by a single PW484-50 S1; total backplane load current surpasses module rated value.

   Action: Calculate overall load current of the FIO rack; decrease I/O module quantity for this power unit; implement 1+1 redundant parallel configuration for PW484-50 S1 to realize load-current sharing.

Abnormal current-sharing performance under 1+1 redundant parallel mode

   Root cause: Unbalanced current distribution between two PW484-50 S1 modules; poor contact on redundant bus connector; mismatched hardware revisions of power modules.

  Action: Inspect redundant parallel bus connector condition; make sure both power modules adopt identical hardware revision; re-insert both power modules firmly; monitor output-current balance of each individual module.

Intermittent voltage and current jitter caused by module over-temperature protection

  Root cause: Insufficient cabinet ventilation; ambient operating temperature out of allowable range; heat sink clogged with accumulated dust.

  Action: Remove dust from module surface and heat sink; enhance cabinet cooling and air convection; maintain operating ambient temperature within -20℃ ~ +70℃.

Backplane bus short-circuit or abnormal partial load brings about output-current swing

  Root cause: Short-circuit fault on FIO rack backplane; faulty I/O module dragging down backplane bus voltage; short-circuit failure on rear terminal blocks.

  Action: Power down the rack and remove all I/O modules; energize PW484-50 S1 under no-load status and verify whether 5VDC output returns stable; plug in I/O modules sequentially to identify defective I/O unit; check rack backplane for foreign-caused short-circuit points.

Hardware performance degradation of PW484-50 S1 power module

  Root cause: Aging of internal electronic components; historical damage from over-voltage or over-current events; internal circuit failure.

  Action: Conduct hot-swap operation with verified good spare PW484-50 S1; compare voltage-current output performance; replace the faulty module if the symptom vanishes after replacement.

• 
  PW484-50 S1 datasheet pdf
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