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OPERATING INSTRUCTIONS
WARNING
Explosions, fires, or electric shock hazards can be reduced through
thermal and over-current protection, good maintenance, proper
grounding, and enclosure selection. Review safety considerations
outlined in “Safety Precautions” and “Installing the Control.”
Preliminary Checks
1. Before starting the control, check all fuses, connections, and adjustments
such as horsepower DIP switch settings.
2. Proper consideration should be given to all rotating members. Before
starting, be sure keys, pulleys, etc. are securely fastened. Proper guards
should be provided to prevent hazards to personnel while the equipment
is rotating.
3. Mechanical considerations such as proper mounting and alignment of
products, and safe loads on shafts and gears should be reviewed. Do not
depend upon gear friction to hold loads.
4. The motor or gearmotor should be securely mounted (because of possible
reaction torque). Test the motor/gearmotor unloaded to be certain that
proper connections have been made.
Operating the Control
WARNING
The 115 VAC line cord should be disconnected before starting
1. Toggle the input power switch to OFF and set the speed potentiometer to
ZERO (fully counterclockwise).
2. Set the F-B-R switch to the “Brake” position.
3. Connect the 115 VAC power cord to the external power source. Then toggle
the 115 VAC input power switch to the ON position.
4. Set F-B-R switch to forward or reverse depending on the direction of shaft
rotation you require.
5. Turn speed potentiometer knob until motor rotates. Then adjust the
potentiometer to achieve the desired speed. If you wish to reduce the
torque level, refer to Internal Adjustments below.
6. If the motor does not operate, check first if the POWER lamp on the outside
of enclosure and the red FAULT light on the inside are on. Then disconnect
the AC power cord and check all connections and fuses. If a fuse is blown
and the motor is not locked (stalled) or overloaded, do not replace the fuse.
The control may be damaged. Refer to Troubleshooting on page 15 and
follow instructions. If the motor is overloaded, reduce the load and replace
blown fuses with new ones of the proper type and rating. (See Figure 3.)
Summary of Contents for 3912
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