Scroll Medical & Laboratory Compressed Air Systems
Powerex
•
150 Production Drive
•
Harrison, OH 45030
•
USA
P 1.888.769.7979
•
F 513.367.3125
•
www.powerexinc.com
IN907800AV
•
08/2018
Page 29 of 40
Procedures for System Maintenance
Risk of Injury. Lock out and tag out the motor
branch disconnect before performing work on the
pump-motor module.
The Powerex scroll system is designed for a small overall footprint.
To provide access to the scroll pumps and motors, each bay has a slide
out system for the baseplate. Review the image below to understand
the general configuration of the slides. The fasteners that secure the
baseplate to the slide rails should be loosened but not completely
removed so that the baseplate cannot be inadvertently removed from
the support frame while working. After completing work, restore the
slide to the original position and tighten the fasteners.
General Procedures for utilizing the service slide rail system to
access the pumps and motors.
Each pump-motor assembly is mounted to a baseplate. The
baseplate is supported by slotted rails that allow the complete
assembly to be pulled out of the frame for access.
In the view above left, the pump-motor assembly will slide out after
the aftercooler assembly is removed.
First select the pump motor assembly to be serviced. Use the
electric panel to Lock out and tag out the Motor Protector Circuit
Breaker (MPCB) for that assembly. If work is to be performed on
the temperature switch for that assembly it must be disconnected
from the power feed in the panel while the panel is de-energized and
locked out. IN some cases multiple pumps are grouped together to
operate as a 10 or 15 HP group, so make sure the affected circuits are
all addressed.
Once the electric power supply is locked out, locate the handle
for the intake filter isolation valve associated with that pump
motor assembly. The valve may be closed at this time. NOTICE: Do
not operate the unit with the intake valve closed – damage to the
pump will result and will not be covered by warranty. The outlet side
isolation valve can now be located and closed. Applicable codes and
standards may require a locking cover or other device be placed on
the valve handle.
Disconnect the union fitting on the inlet flex hose. Also disconnect
the fitting joining the pump outlet flex hose to the after cooler inlet.
Disconnect the after cooler assembly outlet flex hose from the outlet
pipe manifold assembly. Unplug the after cooler fan power supply
wire and tuck it safely away. Now you can undo the bolts that hold
the after cooler assembly to the frame and move the assembly out of
the way of the pump.
Bolt Removal
The baseplate has four L shaped brackets securing it to the rail.
These brackets have carriage bolts that fit in the rail slots and elastic
insert nuts. Using an appropriate wrench, loosen the nuts a few
turns, but do not remove the nuts completely. Just generate enough
clearance to allow the bracket to slide on the rail. Once all are loose,
remove the two bolts on the pump side all the way. You can now
carefully slide the assembly outward. Pay attention and disconnect
any ties on the temperature sensor wires or on the motor conduits as
you go. The motor conduit and inlet flex hose may need to be eased
out of their normal positions to facilitate the outward sliding. The two
motor side L bracket bolts will prevent the assembly from sliding all
the way out of the rack. Be careful if you loosened them too much as
the baseplate may now want to sag down.
