Powering Up the IOLAN
44 IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0
DC Power Models (excluding Electric Utility models)
To power up the IOLAN with DC power requirements, perform the following steps:
1. Verify that the power switch on the IOLAN unit and the power source is in the Off position.
2. Connect the primary and secondary DC input usi ng the following specificatio ns:
a. Use wire gauge 20 to 22 AWG.
b. Strip insulation 7mm from wire ends. (If using stranded wire, twist all strands together to
ensure all wire strands are used for the connection.)
c. Connect supply with reference to the terminal block diagram and electri cal sp ecifications:
Earthing wire
Secondary Supply: Negative (-) wire
Secondary Supply: Posi tive (+) wire
Primary Supply: Positive (+) wire
Primary Supply: Negative (-) wire
DC Power Supply
Note: When connecting only a single power suppl y source, ensure the connection is the
primary supply and the secondary terminals are left unconnected.
Primary Supply:
Positive (+) wire to Circuit 1, terminal marked +
Negative (-) wire to Circuit 1, terminal marked -
Secondary (back-up) Supply:
Positive (+) wire to Circuit 2, terminal marked +
Negative (-) wire to Circuit 2, terminal marked -
Note: When connectin g dual power supply sources, the IOLAN supports a common
positive (+) circuit arrangement ONLY.
Earthing Wire:
Ground wire to terminal marked with circular earthing symbol.
Screws:
Tighten terminal connector block screws to 7 lbs-inches torque.
3. Switch On the power supplies.
4. Switch On the IOLAN. (The power LEDS 1 and 2 will indicate the status of the power source at
the respective input. If both the primary and secondary power source are available, both LED 1
and LED 2 will be luminated indicated power detected from each input.)