2-9
MN716
J6 - Current Limit Mode
(Factory set for TCL). The BC200/BC201 contains electronic current limiting which limits the maximum
DC current to the motor, (the current limit set point is established with the setting of the CL trimpot).
Two modes of current limit operation are provided:
Timed Current Limit, TCL
Note: For the Timed Current Limit feature to operate, the Start/Stop control circuit must be used.
Also, the Timed Current Limit feature cannot be used in either torque mode since nuisance tripping
will occur.
In Timed Current Limit mode the drive will turn off after being in current limit for a preset time.
This time period is adjustable with the TCL trimpot from 0.5 – 15 seconds and is factory set for
approximately 5 seconds. To restart the control after it has timed out, the start button must be
pressed.
Non-Timed Current Limit, NTCL
In this mode, the drive will reach preset Current Limit during overload and stay at that level until drive
is turned off or fuse blows. If Non-Timed CL is desired, move jumper J6 from the factory set TCL
position to the NTCL position. The NTCL position must be used when operating in the torque mode.
J7 - Speed or Torque Control
Described in Operation section of this chapter.
J8 - Speed Linear Torque (S/L) and Non Linear Torque (NLT)
Described in Operation section of this chapter.
Startup
After the control has been mounted properly and electrical connections have been completed and
jumpers are correctly set, start the control as follows:
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.
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