SIEMENS

Item: HM656A

For use with: 400A & 600A VBII Safety Switches, Series "A"

Use only with Siemens certified components.

NOTE - These instructions do not purport to cover all details or variations in equipment, or to provide for every possible contingency to be met in connection with installation, operation or maintenance. Should further information be desired or should particular problems arise, which are not covered sufficiently for the purchaser's purposes, the matter should be referred to the local Siemens sales office. The contents of this instruction manual shall not become part of or modify any prior or existing agreement, commitment or relationship. The sales contract contains the entire obligation of Siemens. The warranty contained in the contract between the parties is the sole warranty of Siemens. Any statements contained herein do not create new warranties or modify the existing warranty.

Recommended tools: 5/16" socket, Extension bar, Torque wrench

TRADEMARKS - Unless otherwise noted, all names identified by ® are registered trademarks of Siemens AG or Siemens Industry, Inc. The remaining trademarks in this publication may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.

Cat. #: HM656A

Components:

• #10-32 x .312"L (4) Mechanism Mounting Screws (All Unit Types)
• Sealing washer (4) (Type 4X units only)
• Handle Grommet (1) (Type 3R, 12 & 4X units only)
• Interlock Grommet (1) (Type 3R, 12 & 4X units only)
• Mechanism (1) (All Unit Types)

Installation Steps

1. Prepare switch for mechanism replacement. Turn OFF and lock out all power supplying this device before working on the device. Turn OFF the switch. Verify that NO voltage is present at the wire grips. Remove any installed fuses (Fusible Switches). Rotate line shields for access to line base mounting screw as shown in Figures 1 & 2. Remove all conductors from the line base.
2. Remove the Line Base Mounting Screws as shown in Figure 2. Keep hardware for re-installation.
3. Slide the Line Base assembly away from mechanism assembly until the rotor clears the mechanism assembly as shown Figures 3 & 4.
4. Lift the line base assembly and enclosure barrier out of enclosure as shown Figure 5.
5. Remove all 3 existing handle guard mounting screws, sealing washers (type 4X), #10-32 nuts (type 4X) and handle guard as shown in Figure 6. Do not throw components away.
6. Remove the two existing handle mounting screws and handle as shown in Figure 7. Do not throw away components.
7. Remove the mechanism mounting screws and sealing washers as shown in Figure 8.
8. Dispose of the mechanism and its hardware as shown in Figure 9. [trash can]
9. For Type 3R, 12 & 4X enclosures, place the new handle grommet and interlock grommet onto the enclosure as shown in Figure 10. When properly seated, the enclosure sidewall will be captivated within the groove in the grommet.
10. Align the new mechanism through the grommets openings. Mount the Mechanism with the Mechanism Mounting Screws (and sealing washers for type 4X) as shown in Figures 11 & 12.
11. Place the handle onto the Mechanism as shown in Figure 13. Secure with (2) #10-32 x 0.5" screws (saved from Step 6 above). Torque to 30 lb-ins. (3.39 Nm).
12. Place the handle guard onto the enclosure as shown in Figure 14. Secure with (3) #10-32 x 0.312" screws (saved from Step 5 above). Include sealing washers and #10-32 nuts for type 4X enclosures only. Torque to 30 lb-ins. (3.39 Nm).
13. Place the enclosure barrier and line base assembly into enclosure as shown Figure 15.
14. Slide the line base assembly towards the mechanism assembly. Insert the end of rotor into the mechanism assembly until the line base mounting holes are aligned as shown in Figures 16 & 17.
15. Secure the line base assembly with six #10-32 x 5/8" screws (from Step 2 above) into the enclosure as shown in Figure 18. See Figure 19 for the sequence of the line base mounting screw placement. Torque to 30 lb-ins. (3.39 Nm).
16. While all power supplying the Safety Switch is still OFF and locked out:
    • a. Hold Interlock Lever below the front of the enclosure to operate switch with the door open. (See Figure 14) Move the safety Switch handle to the ON position.
    • b. Cycle the mechanism while checking for smooth switch operation and moveable contact movement. If the switch does not operate in a smooth manner, or if there are any questions about the replacement kit installation, contact Customer Service 1-800-241-4453.
    • c. Turn the Safety Switch OFF.
17. Reinstall line conductors. Torque lugs to the wire tightening torque values listed in the Terminal & Wire Information Table on the interior label.
18. Rotate line shields as shown in Figure 20.
19. Install fuses, if removed in step 1.
20. Close cover before restoring power to the safety switch.

Diagram Descriptions

Figure 1 & 2: Illustrate the line base mounting screws and show the line shield rotated for access.

Figure 3 & 4: Depict sliding the line base assembly away from the mechanism assembly to clear the rotor.

Figure 5: Shows lifting the line base assembly and enclosure barrier out of the enclosure.

Figure 6: Illustrates the removal of the handle guard and its mounting screws.

Figure 7: Shows the removal of the handle and its mounting screws.

Figure 8: Depicts the removal of the mechanism mounting screws.

Figure 9: Illustrates the disposal of the old mechanism and its hardware.

Figure 10: Shows the placement of the new handle grommet and interlock grommet onto the enclosure for Type 3R, 12 & 4X enclosures.

Figure 11 & 12: Detail aligning the new mechanism through the grommets and mounting it with screws, including a torque specification of 30 lb-ins. (3.39 Nm).

Figure 13: Shows placing and securing the handle onto the mechanism with screws, including a torque specification of 30 lb-ins. (3.39 Nm).

Figure 14: Illustrates placing and securing the handle guard onto the enclosure with screws, including torque specifications and notes on sealing washers and nuts for Type 4X enclosures.

Figure 15: Depicts placing the enclosure barrier and line base assembly into the enclosure.

Figure 16 & 17: Show sliding the line base assembly towards the mechanism assembly and inserting the rotor into the mechanism assembly until mounting holes align.

Figure 18: Illustrates securing the line base assembly with six #10-32 x 5/8" screws, including a torque specification of 30 lb-ins. (3.39 Nm).

Figure 19: Details the sequence for placing the first two of the six mounting screws to secure the Line Base Assembly.

Figure 20: Shows rotating the line shields and identifies the Interlock Lever.

WARNING: Electrical Shock Hazard. Could cause death or serious injury. Ensure the Enclosure Barrier is properly installed before restoring power.