Magna-Power SX500-100

FEATURES

A crossover feature protects both power supply and load in constant voltage operation. Automatic crossover circuitry switches the power supply from constant voltage to constant current operation if the output current exceeds a preset limit. This crossover circuitry also protects the load from over voltage during constant current operation by automatically switching the power supply into constant voltage operation The user can adjust the crossover point via the front panel controls.

SX series power supplies are engineered from standardized modules, standardized control panels, and modular cabinets. Modules are configured for system specific applications.

SX series power supplies are fully programmable via resistance, voltage, current, or optional IEEE-488/RS232. Program lines are constantly monitored for range of operation. If a line should open or if a programmable input is set beyond that anticipated, the unit safely shuts down protecting the load.

Differential amplifiers isolate the programming lines from the dc output allowing programming at any distance from the load. Additional differential amplifiers are provided for master/slave series or parallel operation.

Diagnostic functions are contained directly within the supply's control loop. Exclusive circuitry eliminates guesswork as to which function has control -- voltage, current, soft-start, or a fault condition. If the fault condition requires user attention, mains power is disconnected. All diagnostic functions are monitored with optical isolators to be paralleled for master/slave operation. In addition, control functions are also set through optical isolators to allow simultaneous control of one or more SX series units.

Transient response is enhanced by means of feedforward compensation and optional electronic loading. Feedforward compensation detects line and load changes and offsets feedback signals before being corrected with the slower, error amplifiers. Optional electronic loading maintains output rectifiers with continuous current regardless of load conditions. This prevents peak charging of output capacitors and drooping under transient loading.

SX series supplies have three levels of over voltage protection: shutdown of controlling thyristors, disconnect of main power, and optional SCR crowbar. Upon an over voltage condition, the supply must be reset forcing the user to observe the over voltage setting.