Multimode electronic brake monitor system

An electronic brake monitor for determining when the braking time of a power driven machine exceeds at least one of a plurality of preset braking times, said machine having a rotary member connected to a reciprocating member and means for braking said members and means for initiating said braking, said monitor comprising:

• (a) shaft encoder means coupled to said rotary member for providing an absolute shaft position output of said rotary member;
• (b) a generator for producing clock pulses;
• (c) a digital counter connected to said generator and enabled to accumulate clock pulses in response to said initiating means;
• (d) first preset means connected to said encoder, for providing sector signals designating first and second predetermined portions of said shaft position;
• (e) second preset means responsive to said initiating means and said sector signals for establishing at least a first and second mutually independent preset braking time, and for selection of a first preset braking time when said sector signal designates a first portion of said shaft position and for selection of a second preset braking time when said sector signal designates a second portion of said shaft position;
• (f) memory means connected to said counter and responsive to changes in said encoder output for accepting the accumulated contents of said counter;
• and
• (g) comparator means connected to said preset means and to said memory means for producing an alert condition when the contents of said memory means exceeds said selected preset braking times.

An electronic brake monitor for determining the braking time of a power driven machine, said machine having a reciprocating member and means for braking said member and means for initiating said braking means in response to a conincidence signal from said brake monitor, said monitor comprising:

• (a) encoder means coupled to said member for providing an output corresponding to the absolute position of said member;
• (b) preset means for establishing an output corresponding to a predetermined position in the traverse of said reciprocating member;
• (c) comparator means connected to said encoder means and to said preset means for generating said coincidence signal when the encoder output and the preset output are coincident;
• (d) a pulse circuit for producing count pulses;
• (e) a digital counter connected to said pulse circuit and enabled to accumulate count pulses in response to said initiating means;
• (f) memory means connected to said counter and responsive to changes in said encoder output for accepting the accumulated contents of said counter;
• (g) display means connected to said memory means for displaying the contents of said memory.