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MACS II User Manual
101796668 Revision E 9
2.1. Machine hazard
MACS II has multiple subsystems that if not understood and operated correctly can
be hazardous to the operator which can cause serious harm including death. Faulty
procedures or inadequate precautions can also damage the machine rendering it
inoperable.
2.1.1. Pressure
The Macs II has pressurized air and water lines that present a hazard if not
depressurized before maintenance or disassembly.
Shop air is needed at the unit to operate the hydraulic pump, the pressure control
system, the cell lid, the cell body and drawer assemblies. This air is pressured to 100
psi. Before working on any of these devices or connected air lines, shut off the shop
air to the machine. The air lines are plastic and are connected by quick-connect type
fittings.
Domestic water is used by the machine for cell cooling and as a pressurizing fluid.
Shut off the domestic water before working on either of these systems. In some labs,
a separate chilled water system is used for cooling below ambient. This system may
also be under pressure so it should be turned off or disconnected. The drain line has
no pressure on it; it does not need to be disconnected.
The high pressure lines present the greatest hazard as they can hold up to 30,000
PSI water. These lines are ¼ inch OD stainless steel. Operators must ensure that the
pressure in these lines has been bled down to zero before attempting to disassemble
any lines or access the high pressure filter. Dump any pressure using the manual
pressure down system provided in software and verify this by opening the manual
dump valve located on the right side of the turn table assembly. Confirm that all
pressure in the system has been relieved using the pressure gauge located at front-
top of the Macs II machine.
2.1.2. Temperature
The pressure chamber has an electric heating jacket that can heat the cement slurry
to 600°F (315°C). The metal jacket and lid itself will be even hotter than that. Before
opening the pressure chamber or performing any work on the heating jacket, use the
cooling system to lower the temperature below120°F (49°C). Use the temperature
display in the software to gauge the temperature.
The coolant return line can be very hot [212°F (100°C)] at the beginning of a cool
down cycle. Take precautions to not touch the coolant return line. Connect the
coolant return line to drain in a manner which will not cause a burn hazard.
2.1.3. Electrical
The power source for the Macs II is 230 Volts. Disconnect the power from the plug
before attempting any electrical or mechanical maintenance.