MFJ MFJ-1924, Инструкция по эксплуатации, Страница: 7 / 13

MFJ-1924 Screwdriver Controller with Memory Instruction Manual
After entering setup, the setting and the value are displayed. Pressing Up or
Down changes the value. Pressing Buttons 1 – 10 will save the selected value
and move to the next setting. After the end is reached the last value is saved and
the controller continues with normal operation.
Trip Current
This is shown in the menu with a “C” in the left-most digit. The other 3
digits will display the currently selected value. The trip current value is
used to determine when the motor has stalled and immediately shuts the
motor off. This feature protects the motor from damage if the antenna
becomes stalled. The current is displayed as Cxxx, which translates into
x.xx amps. The default setting is C075 or 0.75 amps. This is also the
setting for use with the Ameritron SDA-100 Screwdriver Antenna.
Trip Current Selection
The trip current value is used to determine when the motor has stalled
and immediately shuts the motor off. In order to determine the trip
current value that needs to be set, the controller can be turned on in
current mode to display the current that is read from the current sensor.
In this mode, when the antenna is moved, the current drawn by the
motor is shown. Stalling the motor by moving the antenna all the way
down will show the stall current of the motor. A value between ¼ and
¾ of the stall current should be enough for the trip current setting and is
shown on the display in the same way as setting the trip current.
Relay Delay
This setting controls the amount of time the relays are reversed when
the motor is stopped. When the motor is stopped, the relay that was
moving the motor is deactivated and the opposite relay is activated for
the duration set in the menu. The default setting is 20ms. The values
range from 0ms – 200ms.
UP
This determines which button will move the antenna up. This can also
be used to move the antenna correctly if the motor terminals are
reversed. When UP is on the display, press the corresponding button
(
Up or Down ), which moves the antenna up. This is then saved to
memory. Pressing any other key will not make any changes and simply
exit setup. Since this is the last setting in the setup menu. The controller
will proceed with normal operation.
Saving Memory Positions
To store memory press and hold any button 1 thru 10 until the display
reads done.
©
2006 MFJ Enterprises, Inc. 5