Run Sequence - GAL GALaxy eHydro Manual

GALaxy eHydro Elevator Controller
All of the I/O's are optically isolated between the high voltage section and the low voltage section. The
inputs on the GALX-1121 Main I/O board and the GALX-1134 COP board are separated into 8 inputs
per board (GALX4-0048N input board) that mounts on the larger boards. If an input is determined to be
faulty, the GALX4-0048N board is replaced instead of the input opto-isolator chip. The outputs that are
plugged into the GALX-1121 Main I/O board are short circuit protected and can withstand a direct short
across the terminals. There are two outputs per output board and are covered with a red plastic
protective case. If an output on the MAIN I/O board is determined to be faulty, then the GALX4-0049N
output board is replaced.
The input opto-isolators and the output solid-state relays on the 1106 and 1107 I/O boards are socketed
IC's that are labeled on the silk screen of the various I/O boards with a "U" number (for example U45). If
it is determined through the previous troubleshooting procedures that the input signal is present at the
terminal, but is not being communicated to the CPU, the input opto-isolator may be defective and can
be replaced in the field. If it is determined that the CPU is communicating the output signal to the solid-
state relay, but the voltage does not go high at the terminal, the solid-state relay may be defective and
can be replaced in the field.
The 1123 I/O board has current limiting inputs and short circuit protected outputs. If it is determined
that any I/O on the 1123 board is faulty, the board must be replaced.
Any time IC's or I/O boards are replaced, the power should be turned off and care should be taken in
removal of the old chip or board and replacement of the new one. All of the I/O and their associated
IC's or boards are listed in the wiring schematics.

4.4 Run Sequence

The following diagram in Figure 4-0 shows the run sequence of the controller for an up and down run.
Note that the RUN relay picks before SU or SD but drops at the same time as SU or SD.
Figure 4-0: RUN Sequence
Section 4 - Troubleshooting
4-2