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

15

 

Beck Group 14 drives configured for milliamp 

or dc analog modulating applications include an 
Electronic Signal Receiver (ESR-4).  Several 
control options are available with the ESR-4, 
such as operating more than one drive with a 
single signal source.
 

The instructions below apply to applications 

that require a signal change or to situations 
calling for operation of multiple drives from a 
common input signal.

 

If it is necessary to change the range of an 

ESR-4 board to receive a different input signal 
current, the “R-in” resistor must be changed.  See 
Table 3, below, for the proper value, and Figure 
11 on page 31 for its location on the board.  It is 
mounted on turrets to facilitate the change.  After 
soldering the new resistor in place, recalibrate in 
accordance with the instructions on page 30.  If 
a proper resistor with ±1% tolerance cannot be 
obtained locally, it can be ordered from Beck.

 

Beck drives can be connected in series from 

the same signal for concurrent operation.  Care 
must be taken to keep the polarity correct in each 
drive’s input terminals.  Two or three drives may 
usually be connected in series.  The number 
of drives that may be connected in series is 

limited only by the controller’s (signal source) 
capability to feed current into the total resistance 
of the circuit involved.  Consult the controller 
manufacturer’s recommendations.
 

No change is required to the drive’s cali-

bration for series operation.  An interruption in the 
circuit will actuate loss of input signal (L.O.S.) on 
the drives in the circuit.

 

Beck drives can be connected in parallel to 

the same signal for concurrent operation.  Up to 
four drives may be connected in parallel.
 

For parallel operation, use ESR-4 board no.  

13-2245-05 in each drive, and add a shunting 
resistor across input terminals AA and BB on one 
of the Beck drives.  The value of the resistor is:

Where N = the number of drives.  
Refer to Table 3, below, for the input resistance.  
For example, a 278 ohm shunting resistor should 
be used for four drives in parallel with a 4–20 mA 
input signal.  If the resistance calculation is not a 
standard value, then select the nearest standard 
value.
 

A minor span adjustment is required for each 

drive in a parallel circuit.  An interruption in the 
circuit to one drive will not prevent the other 
drives from functioning, but there will be a slight 
calibration shift.

INSTALLATION