Abacus Lighting, Sutton-in-Ashfield, Nottinghamshire, NG17 5FT, England. Tel: (+44) 01623 511111, www.abacuslighting.com
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3. If the mast is supplied with a gear cubicle this should now be fitted. Ensure that the box sits on
the rear pair of bolts and that the cable entry gland between the box and mast is in place. Using
the fixing bracket as a guide, drill and tap M8 holes in the mast, as required, and secure the box
with the stainless steel screw provided. Fit the retaining washers and nuts to the 4 bolts and
roughly ‘plumb up’ the base section.
Referring to the operating instructions fit the counterbalance
unit and lower the mast base to the horizontal.
4 - 5. Before assembly lay the shaft sections end to end on the ground and ensure by sighting from
one end that the shafts are straight. Check the overlap area for any signs of damage, excess zinc or
weld that may impede fitting of the shafts together and rectify if necessary. It may be necessary to
rotate one or all of the sections to achieve the best alignment. The orientation of the shaft seam
weld relative to the joining section is not important.
With the base section lowered, pick up, locate and slide home as far as possible the larger shaft
section. The minimum overlap distance must be achieved. It may be necessary to tap the shaft as
illustrated to achieve this. Repeat this exercise until all the shaft sections are in position.
6 - 7. Fit the floodlight mounting bracket to the top shaft section and secure with the screws
provided. It should be noted that the power supply cable can be installed during assembly or, if
preferred, after assembly is completed, but prior to fixing the floodlight bracket.
8 - 9. Follow the counterbalance operating instructions (see section 3.6) and raise the mast into its
vertical position and close the mast. Remove and store the counterbalance unit.
After completion of assembly and with the mast raised, recheck for vertical alignment. Use the
levelling nuts to accurately ‘plumb up’ the
mast shaft. It should be noted that the shafts taper
approximately 14mm per metre overall, 7mm per side.
Once satisfactory, all bolts should be tightened to a torque setting of 310Nm on the HL250 and
850Nm on the HL330.
If the gap below the flange is to be grouted it is essential that adequate provision is made for
ventilation and drainage of any water collecting inside the base.
The mast can then be commissioned.
‘Plumbing up’ in
hot weather or climates.
To minimise the effect of the sun on one side of
the mast, which can cause considerable temporary curvature of the mast it is recommended that
the ‘plumbing up’ be carried out very early or late in the day.
