User manual ACOPIAN POWER SUPPLIES-NARROW PROFILE A

[. . . ] Avoid blocking air flow through vented surfaces. If the perforated bottom of a supply is mounted to a solid surface, use spacers at least 3/16" thick between it and the surface to which it is fastened, to permit convection air flow, or punch ventilation holes in the mounting surface. Allow free air to circulate around heat sinks. [. . . ] Outputs may be connected in series to obtain a higher voltage provided that a reverse-biased diode, having PIV and current ratings exceeding the combined output, is used across each output; however, keep in mind that the output current to be drawn cannot exceed the output current rating of the lowest rated supply used. Frequent fuse failure is symptomatic of power supply overload, a short circuited output, a tripped overvoltage protector, or power supply failure. Do not overfuse; this can result in damage to the power supply. If the AC input power contains large voltage spikes (`noise') induced by the switching of high currents, inductive loads, electro-mechanical components, etc. , the input power leads to the supply should include some means of transient suppression. Otherwise, a portion of the noise may be coupled through the supply to the load. The means of suppression that is easiest to install is a 1 mfd capacitor or a metal oxide surge suppressor (MOV) across the AC input terminals of the supply. In extremely severe cases, the use of RF chokes in series with each side *W 2. 87 of the line may also be required. These power supplies operate as constant voltage sources when used at load current equal to or less than their ratings. If the power supply is overloaded, the current limit circuit will automatically reduce the output voltage, and it will then attempt to recover to its normal operating point. Therefore, A TRANSITORY OVERLOAD RESULTS IN A MOMENTARY DROP IN OUTPUT VOLTAGE. However, if the overload is still present when the voltage attempts to recover, the voltage will continue to alternately drop and recover, which will appear as a sawtooth oscillation of the output. Do not operate the power supply in this mode; reduce the load so that an output current equal to or less than the rating of the supply will be drawn. HEATSINK Voltage Adj. TRANSISTOR L N 1. 68 . 62 1. 31 OUT SENS + +­ ­ OUT AC AC Barrier Strip . 375 (Typ. ) with 6-32 terminal screws . 59 . 58 (max. ) 1. 0 8. 47 L N A L L A C O P IA P L IE S P P O WE R S U . A . A D E IN U . S M WARRANTY: Acopian power supplies are warranted to be free from defects in material and workmanship for a period of five years (encapsulated devices and fans, for one year) from date of original shipment. Acopian's obligation under this warranty is limited to repairing any power supply returned to the factory Service Department in Easton, PA and replacing any defective parts. Authorization must be obtained from Acopian before a power supply may be returned for repair. Transportation charges are to be paid by the purchaser. A reinspection and handling charge will be applied to returned units found to have no defects. If a failure has been caused by misuse, operation in excess of specifications, or modification by the customer, repairs will be billed at cost; in such cases, a cost estimate will be submitted before work is started. [. . . ] All models have floating outputs which may be used floating, with either the positive or negative side grounded, and/or in series with another supply(ies). All have built-in short circuit protection and provision for remote sensing of output voltage at the load for applications where voltage regulation is critical. They are conservatively rated for operation at ambient temperatures to +71°C. Connecting Power Supply to the LOAD: T1 K3 K4 K1 Q1 K2 R13 R12 R25 T Q2 Q3 R3 + +OUT +OUT + SENS R4 K8 R14 K7 + C8 Q4 C6 K6 + OVERVOLTAGE PROTECTOR (optional ) * ­ SENS ­ OUT ­ OUT remote V adj LOAD C5 CW C3 R21 R11 + C7 L AC INPUT + C4 R17 R7 K10 K9 + SENS R16 R18 R8 Z3 ­ SENS *THE DOTTED LINE CONNECTION IS REQUIRED, unless remote voltage adjustment is used. [. . . ]