ROCS-PSU
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 @ +40°C
Dimensions
Width............................ 180 mm
Height........................... 271 mm
Depth............................ 377 mm
Weight
Weight is 14.5 K
Permissible Line Distortions
According to MIL-STD-461C CE-01, CE-03.
Efficiency
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 +30°C
28VDC, 40A, 1120 watt at +40°C
28VDC, 36.5A, 1008 watt at +50°C
28VDC, 32A, 896 watt at +60°C
28VDC, 28A, 784 watt at +70°C
Cooling
Natural convection.
Insulation
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
Protections
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
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).
The RCS-PS operates in low and high temperature
operating conditions without experiencing physical
damage or deterioration in performance test conditions
of -40°C to +71°C, per MIL-STD-810D,
Method 502.2 - Low Temperature, Procedure II,
(-40°C for 24 hours).
MIL-STD-810D, Method 501.2 - High Temperature,
Procedure II, (+71°C 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. .