SkyAzúl Greer MG514, Installation, Calibration, And Service Manual

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3.4.2 Internal Status Indicators
The computer unit contains a row of LED indicators for checking computer operation. During normal
operation, all LEDs will be illuminated with the COMM indicator blinking. If not, please contact Technical
Support for assistance. Use the following chart and Figure 3.4.1 for LED location.
LED Indicator Function
D7 Communication Indicator TST0
D8 Battery Power_POS
D9 Communication Indicator TST1
D10 +VP
D11 +10V
D12 COMM (Communication Indicator)
D13 +8V2
D14 +5V
D17 +3V3
3.4.3 Pressure Sensors
There are two pressure sensors installed as part of a MicroGuard® RCI-514 System. Both pressure
sensors are mounted within the computer unit. One is connected to the PISTON side of the boom hoist
cylinder via flexible hose; the other is connected to the ROD side of the boom hoist cylinder via flexible
hose. Both hoses are protected by velocity fuses within the boom hoist cylinder valve block on the end
of the cylinder(s).
The pressure sensor located on the piston side, is subject to the hydraulic pressure needed to support
the weight of the boom, any attachments, and the load. The pressure sensor on the rod side monitors
the pressure necessary to control the down motion of the boom. The computer unit uses this
information (along with other sensors such as extension, length, and angle), to compute the weight of
the suspended load. The maximum continuous working pressure for the sensors is 250 bar (3625 PSI).
WARNING!
BOTH PRESSURE SENSORS ARE PRE-CALIBRATED FROM THE FACTORY AND
SUPPLIED AS PART OF THE COMPUTER. THE PRESSURE SENSORS MAY NOT BE
INDIVIDUALLY REPLACED. REMOVAL OR REPLACEMENT OF THE PRESSURE
SENSORS FROM THE COMPUTER INVALIDATES THE WARRANTY AND WILL
ADVERSELY AFFECT THE PRESSURE CALIBRATION. ANY SERIOUS PROBLEM WILL
NECESSITATE CHANGING THE ENTIRE COMPUTER UNIT.
CHECKING PRESSURE SENSORS
1. Lower the boom until the boom hoist cylinder is completely retracted and on its stop.
2. Loosen both hydraulic connections to the pressure sensors to ensure zero pressure is present
on the sensors.
3. Enter the CALIBRATION MODE and use the “PRESSURE MONITOR” command to view both
sensor pressures and net pressure.
4. Check the PRESSURE values of both sensors. They should be between -75 and + 75PSI. If
not, replace the computer unit.
SkyAzúl, Equipment Solutions www.skyazul.com 301-371-6126