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21
POSITION FEEDBACK: FILM
POTENTIOMETER
The film potentiometer produces a voltage
that is some fraction of the voltage applied across
its resistive element. That voltage fraction is
determined by the position of the wiper on the
resistive element. The potentiometer assembly
also includes two fixed resistors, one on each
end of the resistive element. These resistors
permit suppressed ranges as well as zero-based
position feedback voltages. If position feedback
is desired on drives equipped with an ESR-4
board, two film potentiometers are required: One
for position feedback and the second to supply a
feedback signal to the ESR-4.
LOSS OF CONTROL SIGNAL
(L.O.S.)
Beck drives equipped with the ESR-4 have
the ability to move to a predetermined position
upon loss of input control signal. When the
input signal drops to 13% of span below the zero
setting, the ESR-4 provides an annunciating
signal with one of the following options:
1. STALOS = Stay in place, lock in last position
(triac output available for remote alarm 0.12
to 5A, 120V, 50 or 60 HZ).
2. REVLOS = Extend to the end-of-travel limit
switch position. Connect terminal E to F.
3. FWDLOS = Retract to the end-of-travel limit
switch position. Connect terminal E to D.
4. INTLOS = Move to predetermined intermediate
auxiliary switch position. Consult factory.
When the input signal is lost but the power
remains on, the L.O.S. switch on the ESR-4
board is energized, a red LED on the board
lights and the directional switches are turned off.
The output of the L.O.S. switch is connected
to terminal E which is wired for one of the
predetermined operating modes listed above.