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

28

CALIBRATION 

 2.  Remove jumper from terminals CC to DD and 

replace with a 3.01K ohm resistor (see Table 
11, page 46).  This shifts the range to 4–20 V 
dc.

 3. Using a voltmeter at the appropriate output 

terminals, adjust the Zero Potentiometer with 
the drive at minimum input signal position so 
that output reads 0 V dc.  This changes the 
range to 0–16 V dc.

 

CPS-2 models 20-3400-12, -13, -14, and -15 

are provided with a Monitor / lsolator board which 
delivers an isolated position feedback signal to 
the Electronic Signal Receiver (ESR-4).  The 
Monitor function monitors the CPS-2 position 
signal and compares it to established limits.  If 
the output is outside normal signal conditions, 
the monitor relay contact opens.  This relay may 
be used for either a remote signal indication 
or activation of Loss of Signal operation of the 
drive.
 

No adjustments should be made on the 

Monitor / Isolator board.

 

A red LED indicator and an SPST relay are 

mounted on the Monitor / lsolator board to indicate 
that power is on and that the CPS-2 output signal 
is within normal range.  Normal operating range 
is -1% to +101% (contacts closed) and -4% to 
+104% (contacts open).
 

The SPST relay is rated for 0.1 amp resistive 

at 100 V dc and can be used for remote monitoring 
of the drive’s power or to signal a system failure.

 

Group 14 drives equipped with Electronic 

Signal Receivers (ESR-4) are configured so that 
the input control signal is connected through the 
relay on the monitor board of the CPS-2.  The 
Loss of Signal (L.O.S.) function of the ESR-4 may 
therefore be activated when the CPS-2 signals 
are outside the normal range (see above).  To 
have an out-of-range CPS-2 signal trigger the 
L.O.S.  mode, remove the jumper across the 
relay contacts on the monitor board.  See the 
schematic on page 48 for jumper location.  For 
details on L.O.S.  function, review the following 
section on Input Signal Calibration.

   ends.  CCW movement of the Potentiometer 

decreases the span equally at both ends 
(see Figure 9, page 29, for location of Span 
Potentiometer).

 8.  Loosen the rotor clamp and reset its position 

(use the thickness gauge; see Figure 8, page 
29) to achieve the desired value of maximum 
output signal.  For example, 20 mA. NOTE:  
Rotor adjustment moves the entire span up or 
down.  Also observe the meter as you rotate 
the rotor to ensure that the signal is changing 
in the proper direction.

 9.  Tighten the rotor clamp to 5 Ib-in torque.

 10. Move the output shaft to the fully extended 

and fully retracted positions and check the 
output signal for desired span.  If not correct, 
repeat the procedure from step 5.

11. Remove the meter and resistor, reconnect 

feedback wires, and replace covers.

 12. Torque the terminal cover bolts to 10 Ib-ft. 

Tighten the top cover bolt just enough to 
compress the O-ring seal.

 13. Return electric Handswitch to AUTO position 

and process controller to automatic mode.

 14. On Model 14-108, recalibrate the ESR-4 

board.

 

The Zero Potentiometer is provided on 

CPS-2 models 20-3400-03 and -13 to change 
from a suppressed zero to a zero-based range 
(e.g.  from 1– 5 V dc to 0–16 V dc).  The zero is 
adjustable from - 5% to +30% of span.

 

The following example is given to illustrate 

how the zero is adjusted to effect a range change 
from 1–5 V dc to 0–16 V dc.
 1.  Install the 1–5 V dc unit as a 1–5 V dc range.  

Do not make any adjustments other than 
setting the rotor position.