Baldor BC140, Installation & Operating Manual

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2-5 MN703
Startup & Adjustments
The Voltage Select Switch is located under the cover and must be set before applying power to the
control. Figure 2-4.
For 208/230 Volt AC Line Input
Set the Voltage Select Switch to the 230 position (factory setting). The switch toggle should be in the
lower position with 230 displayed at the top.
For 115 Volt AC Line Input
Set the Voltage Select Switch to the 115 position. The switch toggle should be in the upper position
with 115 displayed at the bottom.
Figure 2-4 Voltage Select Switch Setting
After the control has been mounted properly and electrical connections have been completed,
1. Verify the speed adjust potentiometer is set fully counterclockwise.
2. Apply AC power.
3. Observe the Power ON LED indicator is illuminated. If not on, refer to troubleshooting.
4. Verify correct direction of motor rotation.
Start the control. The motor shaft should begin to rotate as the potentiometer knob is turned
clockwise, or the analog speed reference signal is increased.
Verify the motor shaft is rotating in the desired ‘forward’ direction.
If the direction of rotation is incorrect, stop the control and disconnect AC power.
Switch the motor lead connections at the A+ and A- terminals.
If a tachometer is connected, the leads may also need to be switched for correct signal polarity.
If the CL LED is on, refer to troubleshooting.
WARNING: If possible, do not adjust trim pots with the main power applied. Electrical shock can cause serious or
fatal injury. If adjustments are made with the main power applied, an insulated adjustment tool must
be used to prevent shock hazard and safety glasses must be worn.
TRIMPOT ADJUSTMENTS
The control contains trimpots which have been factory set for most applications. Some applications
may require readjustment to tailor the control for a specific performance requirement.
Minimum Speed Trimpot (MIN)
The MIN Trimpot sets the minimum speed of the motor when the Main Speed Potentiometer is set
fully counterclockwise. The MIN Trimpot is factory set to 0% of base motor speed. To increase the
minimum speed, rotate the MIN Trimpot clockwise. To decrease the minimum speed, rotate the MIN
Trimpot counterclockwise. The MIN Trimpot range is 0% – 30% of base motor speed.
Note: Readjusting the MIN Trimpot will affect the maximum speed setting. Therefore, it is necessary
to readjust the MAX Trimpot if readjusting the MIN Trimpot. It may be necessary to repeat these
adjustments until both the minimum and maximum speeds are set to the desired levels.
Maximum Speed Trimpot (MAX)
The MAX Trimpot sets the maximum speed of the motor when the Main Speed Potentiometer is
set fully clockwise. The MAX Trimpot is factory set to 100% of base motor speed. To increase the
maximum speed, rotate the MAX Trimpot clockwise. To decrease the maximum speed, rotate the MAX
Trimpot counterclockwise. The MAX Trimpot range is 50% – 110% of base motor speed.
Note: The MAX trimpot is inoperative in the voltage following mode.
Caution: Do not set the maximum speed above the rated motor RPM since unstable motor operation ay occur.
Note: Do not adjust the maximum speed above the rated motor RPM or unstable operation may occur.
208/230 Volt AC Line Input
(Factory Setting) 115 Volt AC Line Input