3M DBI-SALA Nano-Lok 3101521 User Instruction Manual page 15

• Twin SRD Fixed D-Ring Harness Interface: Older ExoFit Full Body Harnesses with a Fixed D-Ring require a special
Twin SRD Harness Interface to mount two SRDs on the back of the harness just below the Dorsal D-Ring. To mount
two SRDs on an ExoFit Full Body Harness with the Twin SRD Fixed D-Ring Harness Interface (Figure 11):
1. Loosen the Harness Webbing: Pull out on the Web Straps (A) where they pass through the bottom of the
Dorsal D-Ring (B) until there is sufficient space to insert the Twin SRD Interface between the Web Straps and
Back Pad.
2. Open the Harness Interface: With the Twin SRD Interface orientated as illustrated, push the Locking Sleeve
(C) to the right and then turn clockwise to unlock the Gate (D). Swing the Gate (D) down to open.
3. Thread the first SRD onto the Harness Interface: Insert the Nose of the Connector (E) through the Swivel
Eye (F) on the SRD and then rotate the SRD around to the Gate End of the Connector (G). The Gate can be
closed to allow clearance for the Swivel Eye between the Gate and Spine of the Connector.
4. Position the Harness Interface around the Web Straps: Insert the Nose of the Connector (E) behind the
Web Straps (A). Rotate the Connector behind the Web Straps until the Connector surrounds the Web Straps.
5. Add the second SRD on the Harness Interface: Slide the SRD's Swivel Eye (F) over the Nose of the
Connector (E) and position the SRD Swivel Eye in the Nose End of the Connector.
6. Close the Harness Interface: Allow the Gate (D) to swing closed and the Locking Sleeve (C) to rotate back to
locked position. Once the Harness Interface is closed, pull the Web Straps (A) back through the Dorsal D-Ring to
eliminate slack in the webbing and secure the Harness Interface between the Web Straps and Back Pad.
4.0 USE
;
First time or infrequent users of Self-Retracting Devices (SRDs) should review the "Safety Information" at the
beginning of this manual prior to use of the SRD.
4.1 BEFORE EACH USE: Verify that your work area and Personal Fall Arrest System (PFAS) meet all criteria defined
in Section 2. Verify that a formal Rescue is in place. Inspect the SRD per the 'User' inspection points defined in the
"Inspection and Maintenance Log" (Table 3). If inspection reveals an unsafe or defective condition, remove the system
from service immediately. See Section 5 for more information.
4.2 AFTER A FALL: If the SRD is subjected to the forces of arresting a fall or impact forces, it must be removed from service
immediately. Clearly mark the SRD "DO NOT USE" and then either destroy the SRD or contact 3M regarding replacement.
See Section 5 for more information.
4.3 BODY SUPPORT: A full body harness must be worn when using SRDs. For general fall protection use, connect to the
back (dorsal) D-ring.
4.4 OPERATION: Prior to use, inspect the SRD as described in Table 3. Figure 12 shows system connections for typical SRD
applications. Connect the SRD to a suitable anchorage or mount the SRD on the back of a Full Body Harness per the
instructions in Section 3. On anchorage connected SRDs, connect the Hook (D) or Carabiner on the Load Indicator to the
Dorsal D-Ring (A) on the Full Body Harness. On harness mounted SRDs, connect the Hook (D) or Carabiner to a suitable
anchorage. Ensure connections are compatible in size, shape, and strength. Ensure hooks are fully closed and locked.
Once attached, the worker is free to move about within the recommended working area at normal speeds. If a fall occurs
the SRD will lock and arrest the fall. Upon rescue, remove the SRD from use. When working with an SRD, always allow
the lifeline to recoil back into the device under control.
4.5 TWIN SRD INTERFACE 100% TIE-OFF: When two SRDs are mounted side-by-side on the back of a Full Body Harness,
the SRD Fall Arrest System can be used for continuous fall protection (100 % tie-off) while ascending, descending, or
moving laterally (see Figure 13). With the Lanyard Leg of one SRD attached to an anchorage point, the worker can move
to a new location, attach the unused Lanyard Leg of the other SRD to another anchorage point, and then disconnect from
the original anchorage point. The sequence is repeated until the worker reaches the desired location. Considerations for
Twin SRD 100% tie-off applications include the following:
• Never connect both SRD Lanyards to the same anchorage point (see Figure 14A).
• Connecting more than one connector into a single anchorage (ring or eye) can jeopardize compatibility of the
connection due to interaction between connectors and is not recommended.
• Connection of each SRD Lanyard to a separate anchorage point is acceptable (Figure 14B).
• Each connection location must independently support 12 kN (2,697 lbf) or be an engineered system, as with a
Horizontal Lifeline.
• Never connect more than one person at a time to the Twin SRD system (Figure 14C).
• Do not allow the Lanyards to become tangled or twisted together as this may prevent them from retracting.
• Do not allow any lanyard to pass under arms or between legs during use.
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