Beck, R&J ELECTRIC ACTUATORS FOR INDUSTRIAL PROCESSCONTROL 11-1_9 Manual Do Utilizador

25

 

All Beck drives are shipped completely 

calibrated to the customer’s specifications that 
were written into the equipment order and are 
ready to be installed.  If the need arises to change 
the drive calibration, first confirm that the drive is 
installed as specified and operating properly before 
proceeding with the change.
 

Position reference and demand calibration are 

performed using the DCM-2 customer interface 
panel, but may also be configured using the HART 
or Serial interface.  Calibration of over-travel limit 
and auxiliary switches must be performed using 
the procedure beginning on page 26.
 

 

Standard Group 11 drives are equipped with 

fixed, non-adjustable, built-in mechanical stops.  
All output shaft rotation must occur within these 
stops, which are approximately 108° apart.

 

The over-travel limit switches are used to limit 

the electrical control range of the drive.  These 
switches are cam operated and are set slightly 
wider apart then the drive’s intended full range 
of electronic operation (typically 100°).  The limit 
switches are positioned to provide an electrical 
overtravel protection (typically 101°).  

 

If the drive is short-stroked—i.e., the full travel 

rotation from 0–100% is reduced to less than the 
standard 100° rotation (see page 30)—it may be 
desirable to reset the over-travel limit switches 
(see page 26).  If the limit switches are not reset, 
Handswitch operation of the drive (CW, CCW) 
will still result in the original full range of travel.  
It is best to calibrate the drive and then set the 
limit switches when short-stroking the drive.  The 
switches should be set just outside the calibrated 
range to avoid tripping the switch at the 0% and 
100% positions.  

 

The auxiliary switches are also cam operated, 

but have no affect on drive and DCM-2 operation.  
Therefore, the auxiliary switches can be adjusted 
at any time without affecting performance or 
calibration. 

 

Standard Group 11 drives are equipped with 

fixed, non-adjustable, built-in mechanical stops.  
All output shaft rotation must occur within these 
stops, which are approximately 108° apart; except 
for the 11-169 stops, which are 98° apart.

 

The over-travel limit switches are used to limit 

the electrical control range of the drive.  These 
switches are cam operated and are set slightly 
wider apart then the drive’s intended full range 
of electronic operation (typically 90°).  The limit 
switches are positioned to provide an electrical 
overtravel protection (typically 91°).  

 

If the drive is short-stroked—i.e., the full travel 

rotation from 0–100% is reduced to less than the 
standard 90° rotation (see page 30)—it may be 
desirable to reset the over-travel limit switches 
(see page 26).  If the limit switches are not reset, 
Handswitch operation of the drive (CW, CCW) will 
still result in the original full range of travel.  Because 
the over-travel limit switches define the maximum 
electrical drive range, if they are to be reset, they 
should be adjusted before performing DCM-2 
(demand and position) calibration procedures.

 

The auxiliary switches are also cam operated, 

but have no affect on drive and DCM-2 operation.  
Therefore, the auxiliary switches can be adjusted 
at any time without affecting performance or 
calibration.

DCM-2 LOCAL INTERFACE