Beck, R&J Automobile Parts 14-10 Benutzerhandbuch

30

 

All Group 14 drives equipped for milliamp 

or dc analog modulating applications include 
a fourth generation Electronic Signal Receiver 
(ESR-4).  The ESR-4 board consists of a voltage 
regulator, a signal amplifier, an error amplifier, 
and three solid state output switches.
 

The ESR-4 board controls the position of 

the Beck drive according to the input signal it 
receives.  A feedback signal is delivered to the 
board from either a potentiometer or the CPS-2, 
which is then compared with the input signal.  
The error signal is amplified and used to actuate 
either of two switches to retract or extend the 
output shaft until the signals balance and the 
error is zero.
 

The third output switch is energized when 

the signal falls below a given setting.  This 
L.O.S.  can be used to drive the output shaft to a 
predetermined position.  See section on L.O.S., 
page 28, for further details.

 

Using the input control signal, drive the 

output shaft through its complete range.  Check 
the position feedback signal to confirm that a 
10% input signal delivers a 10% position, a 50% 
signal delivers a 50% position, and a 90% signal 
delivers a 90% position.  If the feedback signals 
do not correspond to the appropriate input 
signals, then the ESR-4 must be calibrated.  The 
tolerance on factory calibration is ±0.5% of span.

 

The input signal can be varied by the 

automatic controller, but if that is impractical, a 
test box may be used.  Connect the test box to 
positive terminal AA and negative terminal BB of 
the terminal block in place of the controller input.

 

Span and zero adjustments are located near 

the edge of the ESR-4 board (see Figure 11, 
page 31).  Monitor the FWD and REV lamps to 
make adjustments.  When the drive is balanced 
or in L.O.S. mode, both lamps are on.  When 
the output shaft is moving, the lamp designating 
its direction of travel goes out.  When the drive 
reaches its end of travel before balance is 
achieved, the lamp will stay out.  Trim the adjust-
ment so that the drive just reaches the limit switch 
and the motor does not run.  Clockwise rotation 
of either span or zero adjustment causes the 
output shaft to drive toward the zero (minimum 
input signal) position.

 

The following procedure should be followed 

to calibrate the ESR-4 board.
 Tools 

required:

 3/32" 

Screwdriver

 

1/2" Combination Wrench

 1. Open the Electronic Signal Receiver and 

Terminal compartment cover (1/2" bolt 
heads).

 2.  Short input terminals AA and BB.
 3.  Turn electric Handswitch to AUTO position.
 4. Short out resistor R35 temporarily with a clip 

lead (see Figure 11, page 31, for location of 
R35).  NOTE:  Drive will retract.

 5. Using a 3/32" screwdriver, turn the zero 

adjustment potentiometer clockwise to its 
maximum position.  Drive will run to zero 
position travel limit (full extension).

 6. Remove short on input terminals and, using 

controller or test box, apply an input signal 
equal to span (e.g. 16 mA for 4–20 mA span) 
NOTE:  Drive may run.

 7. Using a 3/32" screwdriver, turn the span 

adjustment potentiometer clockwise until 
drive runs, then counterclockwise until drive 
just reaches 100% position.

 8. Remove the clip lead on resistor R35 so 

that it is not shorted.  Apply 100%, full range 
position signal (e.g. 20 mA).

 9. Turn zero potentiometer counterclockwise to 

position the drive at the 100% position (may 
require 10–15 turns).

 10. Drive the output shaft to the minimum input 

signal position (e.g. 4 mA).  If necessary, 
turn the zero potentiometer to trim the zero 
position.

 11. Return the drive to the 100% position.  If 

necessary, position the drive using the span 
potentiometer.

CALIBRATION