Use the following as a guideline when specifying Beck Group 22 rotary drives.
Basic Drive Unit
Control drive shall be rated for ____ (3,000 for 22-309, 4,000 for 22-409 or 8,000 for 22-809) lb-ft torque output. An increasing demand signal shall cause the control drive to rotate ___ (CW or CCW).
Model 22-309 control drive shall operate from ___ (120 or 240) volt AC, single phase, __ (50 or 60) Hz. The timing for 100° rotation of the control drive output shall be adjustable down to 30 seconds.
Model 22-409 control drive shall operate from 208 volt AC, three phase, __ (50 or 60) Hz, 1 kV A. The timing for 100° rotation of the control drive output shall be adjustable down to 15 seconds.
Model 22-809 control drive shall operate from ___ (208, 240, 480 or 575) volt AC, three phase, __ (50 or 60) Hz, 2 kV A. The timing for 100° rotation of the control drive output shall be adjustable down to 15 seconds.
Control drive shall have integrated electronics and be able to operate in ambient temperatures of –40°F (–40°C) to 185°F (85°C).
Control drive shall have typical minimum movements of 0.1 degrees, and shall be able to make movements of this size at a 100% duty cycle on a time basis without overheating the electronics or motor. (Motor shall be capable of withstanding unlimited starts / stops per minute or an indefinite stall). Design of the motor shall be such that electrical and thermal overloads are not required. Motor shall be non-coasting with instant magnetic braking without the use of a separate brake winding or mechanical brake.
Control drive shall monitor output torque and be able to stop on overtorque conditions. Torque switches shall not be required. Torque information shall be available to a computer system as a numeric value with a resolution of 2% or finer.
A low-speed, disc-type motor Handwheel (and Handcrank on model 22- 809 drives) shall permit manual operation of the drive without electrical power and without a declutching mechanism.
A five-position, drive-mounted electric Handswitch shall be provided to permit local electrical operation of the unit. Local control can permit or override remote control signals.
The control drive will automatically stay in place on loss of power, and can be set to stay in place on loss of control signal. Optionally, the control drive may be set to move to any customer specified position on loss of the control signal (with power still applied).
Two electrical over-travel protection switches shall be provided. The actuation points of these switches shall be field adjustable. In addition, two undedicated SPDT switches shall be provided for indication of drive position. The actuation points of these switches shall be field adjustable, the wiring points of these switches shall be accessible in the customer terminal area, and the switches shall be rated for 1 amp at 250 volts AC.
Integral mechanical stops shall be provided, and shall be capable of limiting the travel of the drive and load, with or without power.
All bearings and gears shall be permanently lubricated. Motor bearings shall be maintenance-free. Gear train shall have high efficiency spur gears constructed of heat treated alloy steel or ductile iron only. No worm gear mechanisms shall be used in the drive train and all parts shall be permanently lubricated.
Motor shall be TENV, and shall be weatherproof and dust-tight. All field connections shall be made at the customer terminal area. Separate conduit entrances shall be provided for power wiring and control wiring.