Model 422 & Model 422CC Instruction Manual
D01187869
Revision A, December 2015
37
9.2
Cooling Controls
The cooling controls are most often used to cool the cylinder and oil reservoir upon
completion of a test. Water is most often the choice of cooling fluid but a chiller
may also be employed to provide further cooling capacity. The cooling controls
consist of a cooling button located on the main screen. The pressurized
consistometer is equipped with internal cooling coils in the oil reservoir for quick
cooling of the hydraulic oil and faster turnaround between tests. The cooling button
also allows cooling fluid to flow through the cooling jacket surrounding the
pressure vessel. The cooling button may be turned on manually at the completion
of a test to cool the pressure vessel. Alternatively, an automatic cooling procedure
can be used to cool the cylinder as described in the section 7. The reservoir and
pressure vessel cooling are simultaneously operated.
9.3
Electronic Controls
The main power switch is located behind the touchscreen stand towards the rear of
the instrument. This push-button switch contains a red colored LED that
illuminates when depressed and electrical current is flowing. To power off the
instrument, first shut down the Windows operating system properly and then
depress the power switch to the off position. The red LED will then power off.
The electrical box is located at the rear of the instrument along the top. There is a
panel cover for this box which may be removed to access most of the electrical
components. Move the touch screen stand forward to allow removal of the top
panel cover. Always use caution when accessing the electrical box. It may be
necessary to properly shutdown the instrument and remove power before accessing
the electrical components.
The instrument is equipped with a current monitoring relay which monitors the
amount of current being supplied to the instrument. There is an initial start-up delay
and a trip delay. The monitor is set to cut off power to the instrument if it senses
more than 25 amps for more than 30 seconds. This safety device prevents a run-
away heating situation that may be caused by a short or other dangerous current
situation. If the current monitoring relay has been tripped, it is necessary to unplug
the main power cord from the back of the instrument and then plug it back in to
reset.
The motor speed control knob and speed control board are located inside the
electrical box. The motor speed is default set at 150 rpm at the factory. To increase
the motor speed, turn the knob clockwise. To decrease the speed, turn the knob
counterclockwise.
There is a manual pressure release button switch located on the instrument. It is
labeled MANUAL PRESSURE RELEASE. The button switch is for manual
override purposes in case the computer becomes unresponsive to commands and
