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MedeaWiz® Hydra™
.
Hydra Sinking Output Port
When an output is turned on, the "C" terminal is connected internally to the output terminal
and provides the Ground for your external equipment.
The Hydra has "sinking outputs", which means that it switches the Ground or "Minus" side of
the power supply.
In this case you will connect the Positive "Plus" of your external power supply directly to all
output devices.
The Negative "Minus" side of your external power supply will connect to the "C" terminal on
the Hydra.
The Negative "Minus" side of each output device will connect to one of the output numbers 1
through 8 on the Hydra.
*If you are using inductive
loads, such as a relay coil or small solenoid coil, you must also
connect your external power supply Positive "Plus" to this terminal for back EMF protection.
Alternately you may supply external clamping diodes at the coil. Lamps, LEDs and SSR solid
state relays do not require this connection.
Each output is rated for up to 150mA continuous at up to 28 Volts DC, one output active.
The 2 Ohm resistor will begin to heat above 175mA, acting as a fuse to protect the Hydra.
Refer to the Toshiba TBD62083 manual for more technical specifications information.
A wiring example for LED lamps is on page 26.
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