Troubleshooting; General Information; Microprocessor Cpu; Input/Output Boards - GAL GALaxy eHydro Manual

GALaxy eHydro Elevator Controller
Section 4 Troubleshooting

4.1 General Information

The GALaxy controller is equipped with a number of features that aid in troubleshooting any problems
that may occur. The physical layout of the controller provides ready access to all I/O to make voltage
measurements. All I/O boards, except for the Main I/O board, have LED's that monitor the state of the
input. The controller is equipped with an LCD interface on the Main CPU board that displays the I/O
status of Main I/O board, Safety PAL (FPGA) and the NTS Processor. The LCD Interface section
describes the use of the Main CPU LCD interface. In this section, the basic points of troubleshooting will
be detailed.

4.2 Microprocessor CPU

The CPU is very reliable and normally trouble free. With power turned on, the "axy" in GALaxy on the
Main CPU LCD interface should be blinking at one second intervals to indicate that the CPU is running.
If it is not blinking, then check voltage at the 5V terminal with respect to the 0V terminal on the Main I/O
board. This voltage should read 5VDC. If not, then check the input and output voltage of the DC power
supply. If the "axy" is not blinking and 5VDC is present at the 5V terminal with respect to the 0V
terminal, then contact the factory. All job parameters that are field adjustable are stored in a non-
volatile MRAM chip on the Main CPU board.

4.3 Input/Output Boards

The two main sections of all the I/O boards are the low voltage and the high voltage sections. The low
voltage section consists of all the digital interfacing necessary for the CPU to communicate with the field
components. The high voltage section consists of the field components (buttons, switches, lights, relays
and sensors) and their associated input and output signals. The standard voltage for the Main I/O board
and the COP board is 120VAC. However, the I/O expansion boards can accept a voltage range from 24
VAC, 24 VDC and 120 VAC. Serial Hall Call and Hall lantern board are only 24 VDC.
It is very important that the wiring schematics are reviewed in order to determine the voltages for which
the controller was designed before applying power. The majority of problems that may arise with the
control system are due to faulty inputs or outputs on the high voltage side of the system. For example,
having a limit switch not feeding voltage or an acknowledgment light turning on. The GALaxy control
system is designed to enable the technician to check both the high voltage section and the low voltage
section to correct the problem.
The high voltage section is checked with a digital voltmeter, or if available, with the individual LEDs that
are associated with the input. Depending on the particular input or output, the voltage measured at the
terminal will either be "high" or "low" with respect to its reference point. For example, to determine if the
car top inspection input switch was conducting, the voltage should be measured at terminal "INS" with
respect to "GND". If the switch is feeding it should read 120VAC. If the switch is open, the voltage
should read less than 50VAC.
The previous example determines whether or not the field component is functioning properly. However,
to determine if the signal is actually being communicated to the CPU, the signal must be checked on the
low voltage section of the board. The low voltage section is checked from the Main CPU LCD interface.
Using the previous example, from the Main CPU LCD interface, navigate to the "Inputs and Outputs"
menu, "Car Inputs and Outputs" and scroll through the I/O list until the "INS" input is located. The LCD
will display "INS " if the inspection switch is feeding and "INS " if the switch is open.
Section 4 - Troubleshooting
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