80-4281-05
Rev. 03
PURPOSE
The purpose of these instructions is to provide
a step-by-step method for replacing the Beck
Group 22 Control End assembly. The control end
is located on the rear face of the drive beneath the
Handswitch.
The screws and washers included in Table 1 are
provided as part of the replacement kit in the event
that some are lost while servicing the drive. The
subassemblies listed in Table 2 are included with the
control end assembly.
The replacement control end assembly has been fully
calibrated at the factory. This replacement procedure will
return the drive to a close approximation of its original
calibration. Do not calibrate the drive until this procedure
is complete, and then only if necessary. Refer to Beck
Instruction Manual 80-4280-02 for calibration instructions.
REQUIRED TOOLS
1/2” socket
3/32” hex driver
Torque wrenches appropriate for 12 lb-in (1 N•m)
and 10 lb-ft (14 N•m)
Fine point marker
3/16” flat-tipped screwdriver
Grounding strap
WARNING
Electrical shock hazard—disconnect
power before proceeding. Remove
the drive from line voltage and shut off
any external power sources feeding the
auxiliary switches.
PROCEDURE
Refer to Fig. 1 for component identification.
Remove the old control end assembly:
1. Remove power from the drive.
2. Remove the control end cover, using care not to bend
the control shaft or damage the position-sensing
assembly inside.
CAUTION
To prevent Electro-Static Discharge damage
to the electronics, wear a grounding strap
during this procedure.
3. Disconnect the control end assembly electrical
circuits by unplugging the three multi-pin connectors
from the drive. Two connectors lead from the switch
subassembly and the other connector leads from
the Printed Circuit board. To disconnect the switch
subassembly connnectors, use a 3/16” flat-tipped
screwdriver to press the release tab straight back (see
Fig. 1) and pull the plug out of its socket. The connector
leading from the P.C. board slides off with modest force.
4. Loosen the two outermost setscrews on the coupling.
Do not
loosen the inner setscrews.
5. Use a fine point marker to note the position of the
control end relative to the drive body. Mark the drive’s
face immediately adjacent to the top of the notch (see
Fig. 2).
6. Loosen (do not remove) the four mounting clamp button
head screws (3/8” long) and slide the top clamp up over
the edge of the shoulder in the body, immediately above
the stator flange (see Fig. 2). Snug one of the screws to
hold the clamp up while replacing the assembly. Allow
the bottom clamp to hang by the screws.
7. Slide the control end assembly away from the drive
body until it clears the control end shaft.
Install the new assembly:
8. Inspect the control end gasket and replace as necessary.
If the gasket’s condition is good, skip Steps 9–13.
9. Protect the CPS-4 with a static-free cover.
10. Clean the mating face of the drive body to remove any
remaining gasket material and adhesive. Use caution
not to damage or bend the control shaft. Ensure that
the mating surface is free from damage (such as dents
or gouges).
11. Apply a thin film of gasket adhesive (Scotch™ 847 or
equivalent) to the body’s mating face to adhere the
gasket.
12. Press the new gasket into place.
13. Remove the protective cover from the CPS-4.
REPLACEMENT INSTRUCTIONS
CONTROL END ASSEMBLY, CPS-4
REPLACEMENT KIT P/N 12-8061-05 & 12-8061-35
MODEL GROUP 22
E L E C T R I C A C T U A T O R S F O R I N D U S T R I A L P R O C E S S C O N T R O L