KB Electronics KBWM-240 - Manual (Page 10)

E. Fusing – As indicated in Section IIB, the KBWM™ contains a single AC line fuse on
208/230 VAC applications. In the USA and other countries where the 208/230 volt is
derived from two (2) “hot” leads, both AC lines should be connected to a separate dual cir-
cuit breaker. Do not fuse neutral or grounded connections.
F. AC Line Switch – The KBWM™ contains a double pole AC line switch which opens both
legs of the AC line.
V. OPERATION
After wiring is complete, recheck connections to be sure they are correct. Also be sure cor-
rect armature fuse and Plug-in Horsepower Resistor® are installed. Turn main power on.
Internal lamp in power switch should be lighted indicating control is receiving AC line voltage.
Gradually increase main speed dial setting. Motor should rotate in proportion to dial setting.
Note: if motor runs in opposite direction to what is required, turn power off and reverse arma-
ture leads.
WARNING! If control is operated with cover off, be sure to wear safety glasses
and use insulated tools if any adjustments are to be made.
CL LED – A red light-emitting diode (LED) can be found on the speed control PC board. It
lights when the current limit circuit activates, indicating an overload condition. This is normal
when the motor accelerates to full speed or when a transient peak load condition exists.
However, if the LED lights continuously, a severe overload condition may exist. A DC amme-
ter should be installed in series with either armature lead to observe motor current during
actual operation. (See Safety Warning on page 1.) If the actual DC current exceeds the
motor rating, a higher horsepower motor should be used. If actual current is equal to or less
than the rated motor current, the CL adjustment may be incorrect, or the Plug-in Horsepower
Resistor® value may be too high. Refer to the CL trimpot adjustment procedure and the
Plug-in Horsepower Resistor® chart on page 5.
VI. TRIMPOT ADJUSTMENTS AND CONTROL FUNCTIONS
WARNING! If adjustments are made under power, insulated adjustment tools must
be used and eye protection must be worn.
The KBWM™ has been factory adjusted to provide 0 - full speed using the speed control
knob. Minimum (MIN) and Maximum (MAX) speed trimpots are provided to change the
speed settings. The acceleration (ACCEL) trimpot is provided to allow for a smooth start over
an adjustable time period each time the AC power is applied or the Main Speed
Potentiometer is rotated. The DECEL trimpot controls the amount of ramp-down time when
the Main Speed Potentiometer is adjusted to a lower speed. The Current Limit (CL, or torque
output) adjustment is factory set to approximately 1.5 times the motor rating. The IR
Compensation (IR) is factory adjusted to provide excellent motor regulation under normal
operation.
Note: For the IR Comp. and CL trimpot settings to be correct, the proper Plug-in Horsepower
Resistor® must be installed. (See Table 3 on page 5.) Do not attempt to change the set-
tings of the trimpots unless absolutely necessary since they are factory adjusted to near opti-
mum settings.
The following procedure, presented in order of adjustment sequence, should be used when
readjusting all trimpot functions:
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