WHAT IS A CONTROL OPTION?

Group 31 Compact Rotary actuators have one of several model numbers. Each of these Group 31 model numbers is equipped with an electronics package, which are called control options. While other Beck actuator products append the control option to the model number, the Group 31 product line has an inherent association between model number and control option that does not change. The control option number for Group 31 actuators is simply a reference to determine appropriate parts for maintenance. A basic description for each control option is provided below. For details on the electronics components, please visit the Group 31 Electronics section.

CONTROL OPTION	DESCRIPTION	MODEL NUMBERS	CONTROL MODE	STANDARD CONTROL INPUT	STANDARD POSITION FEEDBACK
3	The standard modulating drive offering, models 31-M50 and 31-M30 are equipped with control option 3 electronics. Control option 3 electronics have an analog control board that may be controlled with a 4-20 mA or 1-5Vdc signal and provide an integral 4-20 mA or 1-5 Vdc position feedback signal. The position feedback signal may be of the 2-wire variety if specified at the time of order. Option 3 units are equipped with an electric handswitch for manual electric operation as well as stall protection with annunciation.	31-M50 31-M30	Modulating	4-20 mA	4–20 mA (4-wire)
2	The control option 2 drive, consisting of model numbers 31-350 and 31-330, is a modulating unit controlled with 120 VAC direct to the motor. These units provide an integral 4-20 mA or 1-5 Vdc position feedback signal that is configured for a 4-wire setup, but may be of the 2-wire variety if specified at the time of order. When the drive hits the limit switch at either of the two end-of-travel positions, power is cut to the motor.	31-350 31-330	Modulating	120 V ac	4–20 mA (4-wire)
1	The control option 1 drive is an open/close unit controlled with 120 VAC direct to the motor. When the drive hits the limit switch at either of the two end-of-travel positions, power is cut to the motor.	31-250 31-230	2-position (open/close)	120 V ac	None