Beck, R&J Automobile Parts 14-10 Manual De Usuario

21

 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.

 

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.