30 Operation
The mode selector switch on the drive, mounted on its cover, provides the option of
operating in either MANUAL (mounted speed potentiometer) or AUTO (external
signal source) mode.
Manual mode
Set the mode selector switch to MANUAL if you wish to control the motor speed using
the speed adjust potentiometer mounted on the drive cover. In MANUAL mode, the
motor speed is controlled by the speed adjust knob located on the drive cover. Setting
the speed adjust knob to zero causes the motor to run at the minimum speed
dictated by the MIN SPD trimpot setting. Refer to the Calibration section (page 32) for
information on calibrating the MIN SPD trimpot. Set SIGNAL SELECT switch SW504
to VOLT when in manual mode.
WARNING: If you run the drive in AUTO mode, you
must recalibrate the MIN SPD trimpot to offset any
motor drift caused by the input signal. Refer to the
Calibration section (page 32) for more information.
Enclosed drive operating modes
Auto mode
IMPORTANT: When switching between MANUAL and AUTO modes, you must balance the
MIN SPD trimpot for both operating modes.
Set the mode selector switch to AUTO if you wish to follow an external signal, independent
of the speed adjust knob setting. In AUTO mode, the drive will control motor speed in
proportion to either a 0 – 10 VDC analog voltage or a 4 – 20 mADC current signal. You
must set select switch SW504 to either VOLT to follow a 0 -10 VDC analog voltage or
to CURR to follow a 4 - 20 mADC current signal.
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