Power Supply, Battery Charger, UPS



General Information
The ROCS PSU provides power to its loads in the event of an AC supply failure by sourcing power (24VDC) from a the car battery 120 Amp Hour Lead Acid Batteries. 

It supplies 28VDC, with up to 50A to equipments and charge its Battery concurrently 

Input Voltage - 200/208VAC 3 phase or

                            115/220VAC 1 phase

Out Voltage - 28VDC

Frequency - 45-440Hz.

Output Power - 1232 watt @ +40C 



Width............................ 180 mm

Height........................... 271 mm

Depth............................ 377 mm


Weight is 14.5 K



Permissible Line Distortions

  According to MIL-STD-461C CE-01, CE-03.



   85% nominal


Output Current

  40 amps; regulated over a range of 10% to max amperes.

  < 1% RMS max output at 28VDC, 40 amps.

Operational Temperature

  28VDC, 44A,           1232 watt at     +30C

    28VDC, 40A,           1120 watt at     +40C

    28VDC, 36.5A,        1008 watt at     +50C

    28VDC, 32A,           896 watt at       +60C

    28VDC, 28A,           784 watt at       +70C



  Natural convection.



  Input-to-chassis and input-to- output insulation exceed

  20MW at 500V; output -to-chassis shall exceed

  20MW at 100V.

  The UPS withstands dielectric voltage of 1500VDC

  for 1 minute between input-to-chassis and input-to-output.


  Battery Protections

  Low Voltage Disconnect (LVD)


A furnished redundant low voltage disconnect circuit

  provides protection for the battery, if battery voltage

  decreases below a present level.

The LVD circuit disconnects the battery bus at

  1.8V/cell from loads, rectifier module, and protects the

  battery from excessive discharge.

The UPS outputs dry contact close on fail  to indicate

 that LVD is disconnected.


Emission and Susceptibility Requirements

  The RCS-PSU shall meet all the EMI/EMC requirements

  of MIL-STD-461C, PART 1&2, which is specified herein:

  CE01: Conducted Emissions, Power and

  Interconnecting Leads (120 Hz - 20KHz).

CEO3 Conducted Emissions, Power and

  Interconnecting Leads (15 KHz-50KHz.

 CS02: Conducted Susceptibility, Power and

   interconnecting Leads (30 KHz to 400Mhz).

  CS06: Conducted Emission, Power Leads, and Spikes.

  RE02: Radiated Emissions, Electric Field

   (14 KHz to 1 GHz).

 RS02: Radiated Susceptibility, Magnetic Field,

    Electric Field, Spikes & Power Frequencies

    (30 Hz - 50KHz.)

 RS03: Radiated Susceptibility, Electric Field

   (14 KHz to 1 GHz).



Protection against reversed battery connection

   to the power supply

 Input protection against transients and spikes

  according to MIL-STD-704D

Input line protected by circuit breaker.

Output to battery 28VDC protected by circuit


Output 28VDC to load is protected by circuit


Output 28VDC to Battery is protected by circuit


  The power supply shuts off without damage

   when input voltage is above/below the specified


Over voltage protection

Over load - over current between 105% - 115%

Short circuit - the power supply withstands

  without damage short-circuit conditions. After

  removing the short circuit condition the power

  supply will return to normal operation by itself.


Thermal Protection

  Internal thermal protection shuts off the power

  supply output in case of overheating.  The unit

  automatically resumes operation after cooling


Leakage current

  Leakage current from the battery to the power

  supply when the power supply is in off, shall be

  less than 10mA.


Operating Regimes:

  Constant voltage, constant current with

  automatic crossover


 Mechanical Shock

   The RCS-PSU  is not  shall not suffer damage or

   subsequent failure to meet the specified performance

   when subjected to shock environment during

   transportation, handling, servicing and operation.

   The RCS-PSU designed and built to meet the

   mechanical shock test requirements as specified.

   Test Methods

   MIL-STD-810D Method 516.3 Procedure I.  

   Conditions - 40g @ 11msec/saw tooth, 3 shocks

   on each of 6  directions.



  The RCS-PSU is designed and built to meet the

  humidity test requirements. The RCS-PSU shall

   maintain their specified performance when exposed

  to a relative humidity of 95% non-condensing for both

  continuous and intermittent periods,   

  per MIL-STD-810C Method 507.1

 (conducted for 3 cycles).




  Operational Conditions



   The RCS-PS operates in low and high temperature

   operating conditions without experiencing physical

   damage or deterioration in performance test conditions

   of  -40C to +71C, per  MIL-STD-810D,

   Method 502.2 - Low Temperature, Procedure II,

   (-40C for 24 hours).

   MIL-STD-810D, Method 501.2 - High Temperature,

   Procedure II,  (+71C for 24 hours).





  The RCS-PS meets  the specified performance when

  subjected to random vibration expected during operation

  for ground mobile and aircraft environments per

  MIL-STD-810D. .



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