Operation; Calibration - Gilson AC-250 Operating Manual

4.0 OPERATION

Two major components make up the control system of this machine: the touchscreen and the Variable Frequency
Drive (VFD). The touchscreen allows for intuitive setup and use of the machine and the ability to view, analyze,
and export test data. The VFD controls the motor speed, allowing very efficient use of hydraulic power.
 STARTUP
When the machine is plugged in, the power is
supplied to many components. If the machine
will be off for an extended period of time (a few
weeks or more), it is recommended to unplug
the machine.
The HMI (touchscreen) interface has a power
button in the bottom left corner that turns it
on or off. Once power is applied, a booting
sequence starts and will last between 30
seconds and 2 minutes (see Fig. 4a).
When the booting is complete, the interface will
finish by loading the automatic software package.
To turn the touchscreen off, momentarily push
the power switch. This will initiate the operating
system to shut down and prevent data loss or
file corruption. Once the shutdown process has
been completed, the PWR LED will extinguish,
and line power can be disconnected. The system
is designed to let power remain on the other
components. If the system will be off for an
extended period of time, it is acceptable to unplug
the machine after the above shutdown procedure.
 EMERGENCY STOP (E-STOP)
This button is a safety feature of the machine. If something unexpected
happens while the machine is running, the "E-Stop" button can be
pressed. Pressing this button removes all output power from the
system. This means that the hydraulic pump motor will stop, and
all controls and solenoids will return to their default positions. This
button should be used in emergency situations to kill hydraulic power
on the machine. The button "locks" after being pressed and must be
twisted to reset. Tripping the E-Stop is recommended during routine
maintenance or service of the system, such as changing hydraulic fluid.
After the emergency condition has been addressed, the "E-Stop"
button can be reset. The diagnostics screen will report when the
E-Stop is activated by turning red. It may be necessary to press the
"Reset Drive" button on the diagnostics screen to resume testing after
an E-Stop condition.

4.1 Calibration

ASTM C39 requires concrete compression testing machines to be calibrated and verified annually in accordance
with the most current revision of ASTM E4.
All safety devices and accuracy adjustments are preset during the calibration to give maximum performance
and safe operation.
Each machine is fully serviced and calibrated at the factory. However, ASTM C39 requires that machines be
calibrated after final installation or relocation.
Contact Gilson Technical Support at: 800.444.1508 or techsupport@gilsonco.com for assistance in finding an
independent calibrator in your area.
8
Fig. 4a: Gilson HMI startup and information screens
Automatic Concrete Compression Machine Manual
EMERGENCY STOP
(E-STOP)