501Rla Tube Loading (Rotor And Drive Shaft Do Not Freely Rotate) - Watson Marlow Pumps 501RLA ATEX Manual Del Usuario

15 501RLA Tube loading (Rotor and drive shaft do not freely
rotate)
In some cases the shaft cannot be freely rotated, for example pumpheads incorporated into duplex
units (twin pumpheads) with a fixed shaft or pumpheads used with drives that have mechanical
variators.
Isolate the pump from mains supply.
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Unlock and open the hinged guard.
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Swing out the rotor crank handle until it locks into position.
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Loosen the rotor screw and give the rotor a sharp tap to release it.
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Pull the rotor slightly forward from its seated position on the drive shaft so that the pinned collet
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clears the drive shaft dog and it can rotate freely .
Select the length of tubing required, noting that approximately 240mm is required for the track
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systems.
Note: Due to the common gearbox, the two pump rotors run in opposite directions. This means that
one rotor runs in a clockwise direction and the other runs in an anti-clockwise direction. Please consider
that the tubes may wear at different rates and the effect on the piping arrangements (suction and
discharge) during installation.
Fit one end of the tubing into one of the spring loaded clamps, and then, whilst rotating the rotor
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with the crank handle, feed the tubing between the rollers and the track, aligning it within the rotor
tube guides. The tubing must lie naturally against the track and must not be twisted or stretched.
Refit the rotor on the drive shaft by pushing it back towards the track. The rotor and collet should be
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by engaged with the shaft.
Tighten rotor screw to 3Nm and close hand lever.
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Close guard and ensure locking latch is engaged.
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Note: Images show transparent non-ATEX guard. ATEX guard is opaque because it has a conductive
coating.
PB0346:m-501atex-en-03 28