PowerWalker Rack Kit for 1-10KVA 19" UPS - Manual (Page 2)

Step 2: Use 4 screws to mount rail sliders in back. See chart below:
Step 3: According to UPS height, put nuts on proper location.
Fig. 6 Jumper setting for ACTIVE
CLOSE
Fig. 7 Jumper setting for ACTIVE
OPEN
Step 4: Put UPS on the rail support
Step 5:
Fix the UPS in position with screws
Step 6: Assembly complete
Nut
Nut