2-10
MN716
Trimpot Adjustments
The BC200/BC201 contains trimpots, which are factory set for most applications. Figure 2-1 illustrates
the location of the trimpots and their approximate calibrated positions. Some applications may require
readjustment of the trimpots to tailor the control for a specific requirement. Readjust trimpots as needed.
Forward Acceleration (FWD ACCEL)
The FWD ACC trimpot determines the amount of time it takes the control voltage to reach full output
in the forward direction. It also determines the amount of time it takes for the control voltage, in the
reverse direction, to reach zero output. (FWD ACCEL also sets the Reverse Decel.)
Reverse Acceleration (REV ACCEL)
The REV ACC trimpot determines the amount of time it takes the control voltage to reach full output
in the reverse direction and the time it takes for the control voltage, in the forward direction, to reach
zero output. (REV ACC is the Forward Decel)
The FWD and REV ACC trimpots are factory adjusted to 1 second.
The acceleration times are adjustable to a maximum of 15 seconds.
Notes:
1. The FWD and REV CL trimpots settings may override the rapid accel and decel settings.
2. BC211 4-quadrant ACC / DECEL accessory module is available as an option. It provides separate
control of FORWARD acceleration and deceleration and REVERSE acceleration and deceleration.
See Figure 2-10.
Figure 2-10 Accel/Decel Trimpot Adjustment
FW
D
DE
CE
L
RE
V D
EC
EL
FW
D
AC
CE
L
0
-100
RE
V A
CC
EL
100
Sp
ee
d
(%)
Time
Offset
This trimpot determines the amount of bias in the forward or reverse direction. The trimpot is factory
set to provide approximately zero offset, which means neither the forward nor the reverse speed is
favored. Adjust offset to suit application requirement. See Figure 2-11.
Deadband (DB)
The DB trimpot sets the amount of main speed potentiometer rotation required to initiate control
voltage output. It is factory adjusted to approximately 25% of rotation. Adjust Deadband to suit
application requirements by rotating the DB trimpot cw, (increase) or ccw (decrease). See Figure 2-12.
The DB trimpot also determines the amount of delay that will occur before regeneration starts.
(Regeneration occurs when the applied load torque is in the same direction as the motor rotation.)
To readjust the DB to factory setting:
a. Set Main Speed pot to zero speed position.
b. Set DB trimpot to full CCW position.
c. Adjust DB trimpot CW until motor hum is eliminated.
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