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RCS-PSU Ground Military UPS

RCS-PSU Military UPS and  Battery  Charger is built for military environment of Airborne, Naval and Ground Mobile applications.


Input Voltage - 200/208VAC 3Ø or 115/220VAC 1Ø

Out Voltage - 28VDC

Frequency - 45-440Hz.

Output Power - 1232 watt @ +40C 



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

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

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


Weight is 13 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, 50 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  70


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

RCS-PSU meet the EMI/EMC requirements of MIL-STD-461C, PART 1 & 2, specified herein:

CE01: Conducted Emissions, (120 Hz - 20KHz).

CEO3 Conducted Emissions,  (15 KHz-50KHz.

CS02: Conducted Susceptibility, (30 KHz to 400Mhz).

CS06: Conducted Emission, Power Leads, and Spikes.

RE02: Radiated Emissions, Electric Field (14 KHz to 1 GHz).

RS02: Radiated Susceptibility,  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 breaker.

Output 28VDC to load is protected by circuit breaker.

Output 28VDC to Battery is protected by circuit breaker.

The power supply shuts off without damage when input voltage is above/below the specified limits.

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 down.


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

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.

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.

Operational Conditions



RCS-PSU 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).



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).



RCS-PSU meets  the specified performance when subjected to random vibration expected during operation for ground mobile and aircraft environments per MIL-STD-810D


ETI Services Inc.    1400 N Jefferson St., Anaheim CA. 92807    Tel: +1-714-524-2986,  +1-714-305-5210 Fax: +1-714-524-8771  E-mail:       CAGE Code: 1PZ92