Beck Group 22 CPS-4 Guide

PURPOSE
The purpose of these instructions is to provide
a step-by-step method for replacing the Beck
Group 22 CPS-4 switch assembly. The switch
assembly is a subassembly of the control end and the
switches are preset; no adjustment of the switch arms is
necessary. The assembly is not user-serviceable and
should not be disassembled in the eld. Components
of the switch assembly are listed in Table 1.
The switch assembly is located in the control end on
the rear face of the actuator beneath the Handswitch.
REQUIRED TOOLS
The following tools will be needed:
1/2” socket wrench
Cross-tipped screwdriver
Multimeter
Torque wrenches appropriate for 12 lb-in (1.4 N•m)
and 10 lb-ft (14 N•m)
Scotch™ 847 gasket adhesive or equivalent
Grounding strap
3/16” at-tipped screwdriver
WARNINGWARNING
Electrical shock hazard—disconnect
power before proceeding. Remove the
actuator from line voltage and shut o󰀨
any external power sources feeding the
auxiliary switches.
PROCEDURE
Refer to Figure 1 for component identication.
Remove the old switch assembly:
1. Remove power from the actuator.
2. Remove the control end cover.
CAUTION
To prevent Electro-Static Discharge
damage to the electronics, wear a
grounding strap during this procedure.
3. Disconnect the switch assembly by unplugging the
two connectors leading to the actuator body. To
unplug the connectors, use the 3/16” at-tipped
screwdriver to press the release tab straight back
and slide the plug out of the socket (see Fig. 1).
4. Using the cross-tipped screwdriver, remove the
(2) cross-recessed screws fastening the switch
assembly to the stator (see Fig. 1).
5. Slide the assembly away from the actuator body
until it clears the coupling. Ensure the switch
arms do not catch on the cams or coupling while
removing the assembly.
Install the new switch assembly:
6. Slide the new assembly onto the shaft, ensuring
the switch arms do not catch on the coupling
or cams. Ensure that the small alignment pin
directly adjacent to the large opening in the switch
assembly mounting plate slides into the alignment
hole provided.
7. Check the mounting of the switch assembly to
ensure that it is ush and square to the rectangular
ange on the CPS. Install the (2) provided screws
(and washer, if applicable) and tighten to 12 lb-in
(1.4 N•m) torque.
8. Inspect the control end gasket; replace as
necessary. If the gasket is in good condition, skip
steps 9–10.
9. Clean the mating face of the actuator body to
remove any remaining gasket material and
adhesive. Ensure that the mating surface is free
of defects such as dents or gouges.
10. Peel the backing o󰀨 the replacement gasket and
carefully apply to the actuator body.
Test for proper operation—check switch operation:
11. Plug the connectors into their respective sockets.
12. Connect power to the actuator.
13. Run the actuator through its full range of motion.
Observe the actuator to verify the correct response.
Note whether or not the actuator stopped at the
correct position.
80-4281-06
Rev. 3.4
REPLACEMENT INSTRUCTIONS
CPS-4 SWITCH ASSEMBLY
REPLACEMENT KIT P/N 12-8061-06 & 12-8061-36
MODEL GROUP 22
ELECTRIC ACTUATORS FOR INDUSTRIAL PROCESS CONTROL

14. Using the Handwheel (with the Handswitch in
“STOP”), test the over-travel limit and auxiliary
switches for continuity at their pin connections. The
over-travel limit switches should change state within
half of a degree beyond the electronic stops. The
auxiliary switches are factory set to change state
about 2 degrees before the electronic stops unless
otherwise noted in the actuator’s specication.
15. If the switches do not operate automatically, the
cams need to be adjusted. See Beck instruction
manual 80-4280-02 or 80-4280-10.
16. When the switches have been tested and the
actuator is operating correctly, replace the control
end cover and tighten the cover bolts to 10 lb-ft (14
N•m) torque.
17. Return the actuator to service.
Table 1: CPS-4 Switch Assembly
Replacement Kits
Description Part Number
Kit No. 12-8061-06
Switch Assembly 20-3200-20
Screw #8-32 x .375" (2) 30-0329-42
Gasket, Control End 10-8080-02
Kit No. 12-8061-36
Switch Assembly 20-3200-28
Screw #6-32 x .312" (2) 30-0323-71
Washer (1) 14-9890-05
Gasket, Control End 10-8080-02
6/21
11 TERRY DRIVE NEWTOWN, PENNSYLVANIA 18940 USA
PHONE: [phone] FAX: [phone] E-MAIL: [email protected]
www.haroldbeck.com
HAROLD BECK & SONS, INC.
R
R
Made in USA
Figure 1
SWITCH ASSEMBLY
SWITCH
ASSEMBLY
THUMB
NUT
PIN CONNECTOR
PIN CONNECTOR
PRINTED
CIRCUIT
BOARD
PRINTED
CIRCUIT BOARD
Press tabs straight back to
release connectors
KEEPER
ASSEMBLY
KEEPER
ASSEMBLY
PIN
CONNECTORS
PIN
CONNECTORS
SWITCH CAMS
CROSS-RECESSED
SCREWS
COUPLING
INNER SETSCREWS (2)
(Do Not Adjust)
OUTER SETSCREWS (2)
NOTE: Tighten the setscrew
on the at of the shaft rst.
Please note: The printed circuit boards used with the CPS-4, 2-wire congurations have
a pin connector oriented horizontally (rather than vertically as pictured above with the
4-wire congurations). Other dierences include pot and switch locations, but they do not
aect the procedures in this instruction.