System and method for detecting fluid delivery system conditions based on motor parameters

An apparatus for detecting a condition in a fluid delivery system, said apparatus comprising:

• a motor control configured to provide electric power to an electric motor;
• a logic circuit in communication with the motor control;
• and
• a memory in communication with the logic circuit, wherein the memory is configured to store a first rate threshold associated with a register condition;
• wherein the logic circuit is configured to (1) determine at least one motor parameter at a plurality of different times, and (2)compute a rate of change value in the at least one motor parameter, and (3) determine a register condition if the computed rate of change value exceeds the first rate threshold;
• wherein the at least one motor parameter is system current, system power, system efficiency, motor current, motor power, or motor efficiency;
• and
• wherein the system comprises a cooling coil,
• wherein the memory stores a second rate threshold associated with a frozen coil condition, and
• wherein the logic circuit is configured to determine the frozen coil condition if the rate of change parameter exceeds the second rate threshold.

An apparatus for detecting a condition in a fluid delivery system, said apparatus comprising:

• a motor control configured to provide electric power to an electric motor;
• a logic circuit in communication with the motor control;
• and
• a memory in communication with the logic circuit, wherein the memory is configured to store a first rate threshold associated with a first system condition;
• wherein the logic circuit is configured to (1) determine at least one motor parameter at a plurality of different times, (2) compute a rate of change value in the at least one motor parameter, and (3) determine a first system condition if the computed rate of change value exceeds the first rate threshold;
• wherein the at least one motor parameter is system current, system power, system efficiency, motor current, motor power, or motor efficiency;
• wherein the memory is configured to store a second rate threshold and wherein the logic circuit is configured to determine a second system condition if the computed rate of change value exceeds the second rate threshold but not the first rate threshold;
• and
• wherein the first system condition comprises a register condition and wherein the second system condition comprises a frozen coil condition.

An apparatus for detecting a condition in a fluid delivery system, said apparatus comprising:

• a motor control configured to provide electric power to an electric motor;
• a logic circuit in communication with the motor control;
• and
• a memory in communication with the logic circuit, wherein the memory is configured to store a first rate threshold associated with a first system condition;
• wherein the logic circuit is configured to (1) determine at least one motor parameter at a plurality of different times, and (2)compute a rate of change value in the at least one motor parameter, and (3) determine a first system condition if the computed rate of change value exceeds the first rate threshold;
• wherein the at least one motor parameter is system current, system power, system efficiency, motor current, motor power, or motor efficiency;
• wherein the memory is configured to store a filter threshold, and wherein the logic circuit is configured to determine a filter condition if the determined motor parameter exceeds the filter threshold;
• and
• wherein the memory is configured to store a register variable corresponding to the number of closed registers, and wherein the logic circuit is configured to update the register variable in the memory in response to a determined register condition.