System to control a motor for the assembly or dis-assembly of two members

A system for controlling the operation of a motor being used for the rotational assembly or dis-assembly of two operatively inter-engaging threaded members of a threaded tubular connection comprising:

• means for monitoring and generating a torque signal representative of the torque exerted by the motor on one threaded member relative to the other threaded member;
• first processor means and second processor means;
• first relay means for relaying the torque signal to said first processor means;
• second relay means for relaying the torque signal to said second processor mean, wherein said first processor means including a computer which digitally analyzes the torque signal and is programmed as to generate a digital first control signal in response to the torque signal;
• digital-to-analog converter means converting the digital first control signal into an analog signal, said second processor means including means for comparing the analog signal with the torque signal and for generating a second control signal representative of the difference between the analog signal and the torque signal;
• and
• motor control means connected between said second processor means and the motor, wherein said second processor means transmitting the second control signal to said motor control means for controlling operation of the motor to an extent proportional to the magnitude of the second control signal.