Hardy HI 4050, User Manual

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35 Chapter 3
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Step 2. Connect the power supply plus side to the relay coil.
Step 3. Connect the return side of the relay to a DIO output terminal.
Resettable Fuses
A current exceeding the limit trips a thermal fuse. The fuses will trip if any of the outputs
are shorted to a power supply, causing the output voltage to rise to a high logic voltage
level. The output will remain in the high state until the user resets the fuse.
To reset the fuse, either remove the power source from the output until the circuit cools
(about 30 seconds) or toggle the digital output in question to a high voltage state for 30
seconds.
Installing a Card in the Network Slot
While some cards use a 16-pin board stacker and others use a or 40-pin board stacker, the
process for installing an optional card in the network slot is basically the same:
Step 1. Plug the 16-pin or 40-pin 28mm board stacker into the header on the network
option card.
Step 2. Align the board stacker pins with the16 right-side pin holes for the network slot
Header (J41) located on the bottom of the Main Controller board.
Step 3. Using two fingers gently push the board stacker pins into the network slot header
until the standoffs touch the bottom of the main controller board.