SECTION 1 GENERAL DESCRIPTION
1.0 DESCRIPTION
The Model AEC-432 is a power supply system designed to power a CAMAC Modular Instrumentation System Crate and provide air cooling for the Crate and its Modules.
Designed with a maintenance-free life expectancy of 5 years, materials and construc- tion utlized are consistent with this requirement. Semiconductors are all-silicon devices and hermetically sealed in metal or ceramic cases. Components are derated based on maxi- mum operating stress conditions including temperature rise.'
A portion of the Specification dated May 10, 1972 entitled "Specification for a Typical CAMAC Power Supply" is appended to this manual. The performance of the Model AEC-432 equals or surpasses the requirements of the Specification. An automatic system for monitor- ing the power supply status is provided. (See paragraph 2.12).
2.0 ELECTRICAL CHARACTERISTICS
2. 1 INPUT: 103-129/206-258 VAC, 47-65 Hz. Maximum input power at maximum input line voltage is less than 750 watts.
2.2 OUTPUT: Four DC outputs are provided as follows:
+6 VDC at 0-25 A
-6. 00 VDC at 0-25 A
+24. 00 VDC at 0-6 A
-24. 00 VDC at 0-6 A
The four outputs are simultaneously available at PG-26, the Power Supply/CAMAC Crate Interface Connector. Maximum output power is 294 VA. The +/-6.0 V sources operate on a current sharing basis with the total combined output current limited to 25 A. The +/-24 V supplies are similarly current shared with the combined output current limited to 6 A. Rated output current is also available for loads connected between the positive output terminal of the +6 V supply and the negative output terminal of the -6 V supply. Similarly, rated output cur- rent is available for loads connected between the positive output of the +24 V supply and the negative output of the -24 V supply. Remote sensing is provided on all four outputs so that the points of regulation (junction of load and sense leads) may be made as close to the CAMAC Crate modules as possible.
2.3 REGULATION AND STABILITY (Measured at PG-26 with jumpers between load and sense leads):
2.3. 1 +/-6. 0 V Output: Maximum output voltage change is less than 0. 1% due to changes of input line voltage and output current over the operating range for a 24-hour period.
2.3.2. +/-24 V Output: Maximum output voltage change is less than 0. 1% due to changes of input line voltage and output current over the operating range for a 24-hour period.
2.3.3 Long-Term Stability: After a 24-hour warm-up and for a period of six months at constant load, line and ambient temperature, the +/-6 V outputs will not drift more than +/-O. 5% and the +/-24 V outputs not more than :LO. 3%.
2.3.4 Turn-On Stabilization: All power supply output voltages stabilize to within +/-1% of their final value within one minute under constant line, load and ambient temperature conditions.
2.4 NOISE AND RIPPLE: The maximum output noise and ripple as measured on an oscilloscope with a bandwidth from DC to 50 MHz is less than 5 millivolts peak-to-peak.
2.5 TEMPERATURE; Operating: 0-50'C Storage: -20'C-+85'C
2.6 TEMPERATURE COEFFICIENT-. The temperature coefficient of output voltage is less than .02%/'C over the range 0-50'C.
2.7 RECOVERY TIME. All outputs recover to within +/-O. 2% of their steady state value within 1 millisecond for any line voltage change over the operating range and for 50% step change s in r ated lo ad current (with a minimum lo ad of 5% on any output) .
2.8 TURN-ON/TURN-OFF TRANSIENTS: No observable transients are present during turn-on and turn-off.
2.9 MAGNETIC FIELDS: Magnetic fields of up to 50 gauss in any direction do not affect the electrical characteristics of the power supply.
2. 10 TERMINALS:
2. 10. 1 Input: A 7 foot UL Approved, 3 wire power cord with molded NEMA plug.
2. 10.2 Output: Available at a 26-pin connector, AMP Type 200512-3, designated PG-26 in the CAMAC Specification. Wire size, pin types and location assignments are in accordance with this specification.
2.10.3 Tip Jacks- Provided at the rear of the power supply for monitoring each output voltage. Adjustment of the output voltage may be made, if necessary, by an adjacent screw-slot adjustment potentiometer.
2. 11 PROTECTION
2. 11. 1 Input: Fuses accessible at fuse holders on the rear top surface of the power supply wired in each side of the AC line are provided. Full ratings for both 117 V and 234 V are indicated on a nameplate at the rear.
2.11.2 Overload or Short Circuit: An additional current-summing limiter is provided for the +/-6 V and +/-24 V current-shared supplies. This current limiter monitors the sum of the output currents from each current-shared pair (+/-6 V and +24 V) and operates to limit the total available output current to the maximum permissible value. If this summing current limiter is activated by an overload, it functions to restrict the output current of the negative polarized current- shared source (-6 V and -24 V) to maintain a maximum rated combined current. For example, if an increase in output current occurs on the +6 V or +24 V source such that the total currents for either the +/-6V or the +/-24 V sources exceed rated value, the output current of the -6 V and -24 V supply is limited to keep the maximum output current within rated levels. In practice this results in a sharp reduction in voltage of the -6 V and -24 V outputs since this summing limiter is also of the "fold-back" type.
2. ll.4 Overvoltage Crowbar: An overvoltage crowbar is provided across the output terminals in each of the DC sources. This crowbar operates to short-circuit the out- put terminals of any power supply if any 6 V power supply exceeds 7.5 V or any 24 V supply exceeds 34 V. In the event of crowbar firing due to an internal malfunction, the AC line fuses will fail if a fault occurs in the +/-6 V supply, or an internal fuse will fail if a fault occurs in the +/-24 V supply.
2. 11. 5 Thermal Warning: A thermostat monitoring the maximum hot spot temperature of the supply operates to illuminate a panel indicator when this temperature exceeds 116 +/-3'C. A second thermostat operates to interrupt an AC input line to the power supply If the maximum monitored temperature exceeds 135 +/-4'C.
2.12 MONITORING: The monitoring requirements of paragraph 0 "Monitoring" of the CAMAC Specification have been subtituted by a logic system which perform,$ the manual voltage and current monitoring functions of the Specification automatically.
2.12. 1 Fault Indication: Two panel LED indicators monitor all voltage levels to +/-4% of their value and all maximum current levels (for each output and the sum of each current- shared output). In the event of an overload or malfunction, one or both of these indicators is illuminated.
2. 12. 2 Status Signal: A Logic signal (+5 V) is provided at a binding post on the rear of the supply. This signal monitors operation of the LED fault indicators, the Thermal Warning indicator and the presence of AC input. This signal falls to zero volts (Logic "1") under a fault condition and may be used in a CAMAC System to avoid collection of erroneous data.