Description

This a VME64X 19-inch rack-mounting crate, with a horizontally mounted seven-slot monolithic VME64X backplane, which takes up to seven standard 6U 160 mm cards in front slots (with all three connectors fitted). It has seven rear-facing 80 mm transition slots, (it will take 160mm transition cards in an emergency with a small overhang).

The unit is fitted into a 19-inch rack mounting case, which is RFI protected. It has a single-phase mains driven 440-watt output, power supply. It gives the following outputs: +3.3 V at 35 A, +5 Volts at 40A, +12 Volts at 10A and –12 Volts at 6A. Total power must be less than 440 Watts at 35 C ambient.

Specification 

The Crate is 178 mm high, 435 mm wide and 370mm deep.

The power supply is a single-phase universal input voltage type with an input voltage range of 85 Volts to 265 Volts AC 47-120 Hz. Leakage current <1.24mA at 264V 50 Hz. 

The power supply is a high efficiency (75%) switching type; noise and ripple are less than 1% using the EIAJ test method. A two pole, front mount mains switch controls it.

Power is provided via the IEC 320 connector.  

An international 20 x 5 mm fuse mounted on the rear panel protects the crate. Rated at 5 Amps, (T. HRC 20 x 5 mm type) for 220 to 250 Volt operations. 10 Amps (T. HRC 20x5 mm) type for 100- 115 Volt operations. There is also an internal power supply fuse, which has no user access

The power supply provides up to a maximum power output of 440 Watts at the back plane, at up 35C ambient, this reduced to 400 Watts at 50 C

There are four power lines provided:
+3.3 volts at up to 35 Amps (fully sensed)
+5 volts at up to 40 Amps (fully sensed)
+12 volts at up to 9 Amps.
-12 volts at up to 6 Amps.
Note: The +5 Volt standby line is not connected.

 All the sensed power lines are maintained at +/-1 % over the full line load conditions, there no minimum load requirement. The +/- 12 volt lines are +/-1% at the power supply terminals, and +1%-2% at the backplane under full line load change.

 The total load (the sum of V x I on all output lines) must not exceed the stated power output at the crates actual ambient temperature.

There are front mounted voltage test points, connected to the backplane to test the power supply, together with LED’s to show that the voltages are present. There is also a LED to show if the fan fails. The backplane has connectors to provide additional control outputs and inputs.

All power line output voltages may be adjusted at the factory.

Up to 0.5 volts drop in each power feed circuit to the +3.3 and 5 volt outputs.

Over voltage protection is set at  +120-130%, Auto restart.

Over current protection is 105% -125% typical; it is a constant current type.

Temperature coefficient is 0.02% /C

Inrush current <40 Amps (cold start).

Hold up -16 mS minimum at full load on any output

Isolation: Input to output 4000Vac. Input to Ground 1500Vac, Output to ground 200Vdc

Altitude 3000 meters at 40 C de-rate at 3%/C over 40C max 55C

Humidity: 5%-95% RH (non-condensing).

Power supply Shock and vibration 3000 bumps, 10G 16mS half sine wave 6G triaxial for 15v minutes 10-500Hz, 2G. 

Safety Approvals on the power supply unit: -

UL1950, CSA22.2, No950, EN60950, EN61010-1, IEC61010-1, CE marked for LDV, EN60601, UL2601.

POWER SUPPLY MONITOR 

There is a monitor on the fan, and test points for the backplane voltages. 

A CANBus monitoring system is being designed, which will be available at extra cost

 Special versions with Mains fail, Global Inhibit, Output Good, signal options can be offered at extra cost.

 The Chassis of the Crate is earthed via the IEC 320.

 The power supply outputs are floating as standard. ( see Isolation specification).

 BACKPLANE 

The backplane is a high-speed strip line monolithic type, made by Bustronic Inc which incorporates active termination and automatic interrupt and DMA grant chain linking.

Full details of the backplane are available from the manufacturer Bustronic via their Web site www.bustronic.com under VME64X back-planes. We use the M4 screw type with automatic bus grant.

Copyright © 2001 [Hytec Electronics Ltd]. All rights reserved. Information in this document is subject to change without notice. Other products and companies referred to herein are trademarks or registered trademarks of their respective companies or mark holders. send mail to paul@hytec-electronics.co.uk with questions or comments about this web site.