Selection Process: 700A121/124 DC Motor Speed Control

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MOTOR SELECTION: From our extensive line of DC motors, choose a 6, 12, 27 or 50 VDC motor that has a speed/torque curve beyond the maximum load and maxium speed point at which you would like to operate. To assure that you will have some accelerating torque under the most extreme operating conditions, allow a 15% overload margin as shown. For applications with high inertia in the system (i.e.: more than five times the armature inertia), you may need to increase the overload margin to as high as 25%. When selecting a motor, the only limits on the speed/ torque combination at which the motor can run are the 10 ampere rating of the control and/or the continuous duty rating of the motor you select.

Control Selection   Once you know which DC motor you would like to use, you can select and order a control based on the ratings shown below:

Control Part No.	Input, VDC	Motor Armature** Resistance - OHMs
700A121	30 - 80 VDC	< 5 OHMs
700A122	30 -80 VDC	> 5 OHMs
700A123	12 - 40 VDC	> 5 OHMs
700A124	12 - 40 VDC	< 5 OHMs

**The nominal armature resistance of a motor can be calculated by dividing the motor's rated voltage by the motor's stall current. The rated voltage and stall current of a motor can be found on the "Motor Data" page of that particular motor model.  

 

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