Abstract: A method of checking to determine (a) whether the heating elements and temperature sensors of the various components of a hot melt heating and dipensing system, such as, hot melt dispensers, hoses, and associated reservoir and manifold, are connected in proper circuit configuration, (b) whether any of the heating circuits are in an open-circuit condition and/or their respectively associated signal-controlled switches which control energization of the heaters thereof are short circuited, and (c) whether any of the temperature sensors are open-circuited. The checking is performed by a microprocessor having multiple channels to different ones of which are connected the sensors and signal-controlled switches of the different system components.

Abstract: A method of checking to determine (a) whether the heating elements and temperature sensors of the various components of a hot melt heating and dispensing system, such as, hot melt dispensers, hoses, and associated reservoir and manifold, are connected in proper circuit configuration, (b) whether any of the heating circuits are in an open-circuit condition and/or their respectively associated signal-controlled switches which control energization of the heaters thereof are short circuited, and (c) whether any of the temperature sensors are open-circuited. The checking is performed by a microprocessor having multiple channels to different ones of which are connected the sensors and signal-controlled switches of the different system components.

Abstract: A solid-state event-logging system records the occurrence of specified events in a removable, solid-state, memory cartridge. Counters continuously count pulses produced by a plurality of electrical energy measuring devices. Sample values of the continuous counts are produced and input to a microprocessor wherein each sample value has the previous sample value subtracted therefrom. The difference is added to an interval sum stored in a random access memory. The interval sums, together with real time information produced by a clock, are input to the memory cartridge according to a predetermined format. The clock is maintained in synchronization with the frequency of the line voltage by the microprocessor.

Abstract: A battery charging circuit for continuously charging a back-up battery is disclosed. A switch conducts a charging current to the battery in response to a temperature variable resistor. The charging current is a function of both the temperature and the battery voltage such that the charging current is matched to the charging characteristics of the battery. Additional features include the establishment of a minimum charging current and the capability of testing the battery under load conditions.

Abstract: A current divider having two major current paths and a shunting current path is disclosed. The shunting current path connects the two major current paths at a point on each major current path such that the shunting current path connects points which have slightly different voltage potentials. This slight difference in voltage potentials causes a current to flow in the shunting current path. The current that flows in the shunting current path is a predetermined fraction of the total current and is primarily dependent on the difference in voltage potentials which is a function of the location of the shunting current path. The current that flows in the shunting current path is substantially independent of the ratio of the cross-sectional areas and/or the inverse lengths of the current paths in that for a given cross-sectional area of the shunting current path various values for the current split off may be obtained by varying the location of the shunting current path.

Abstract: A current sensing transducer includes a conductive current divider including a branch path for conducting a fractional current proportional to a current to be sensed and being applied through the divider. A compensated transformer includes a primary circuit responsive to the fractional current and two secondary windings. An amplifier circuit controls the current input to one secondary winding in response to the output of the other secondary winding so that the flux of the primary circuit is virtually compensated in the core and the secondary winding current is a measure of the current to be sensed.