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Frequency Drive for Traversing Motor
The Best Reach Rigid Roller’s traversing motor uses a 2 HP AC Tech frequency drive,
model SF420 for 480V systems and model SF220 for 230V systems, to provide a soft start,
programmable accel and decel times and braking.
Control wiring used for this drive is the ALTERNATE TWO-WIRE START/STOP CONTROL
found on page 20 of AC Tech’s SCF Series manual. In order for the drive to function
properly in this mode,
a jumper must be in place between the drive’s TB-2 terminals 1
and 2. Forward and Reverse are controlled by the Best Reach’s PLC relay outputs wired
to the drive’s TB-2 terminals 2 (common), 12 (forward) and 13A (reverse).
The AC Tech drive is field programmable. The following list shows the parameters that are
programmed before being shipped with the Best Reach unit. All parameters not shown in
this list remain set to the factory defaults.
Frequency Setting: 60 HZ
This frequency drive has built-in over current protection. If an over current fault occurs,
the drive will shut off current to the motor and will display “PF”. While this error code is
displayed, the conveyor cannot be driven. The frequency drive will reset itself after
approximately 30 seconds. The conveyor can be driven after this reset time if the
conditions that caused the fault have been removed.
AC Tech Frequency Drives
Parameter Value
04 03
10 05
17 02
19 1.0
20 0.5
26 75
28 4.4
29 4.4
Parameter List for Traversing Motor