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Hardware and Connectivity 49
Powering Up the IOLAN
1. For terminal# 1 through 8, the use of ring terminals size #6 (M3.5) is recommended using stranded wire size AWG
18-14. Tighten all screws to a torque of 12 Lb-in (1.36 Nm).
2. For terminal# E, the use of ring terminal size #8 (M4) is recommended using stranded wire size AWG 18-14. Tighten
screw to a torque of 12 Lb-in (1.36 Nm).
3. Use the “Chassis Ground” terminal connection for grounding the unit. “Earth Ground” should be used as secondary
grounding source only.
4. Be sure to replace the clear plastic electrical safety shield before applying power to the unit.
Wiring up a the Fail-Safe Relay
The Electric Utility series of IOLAN units are also fashioned with a Fail-Safe Relay. The relay is engaged
after the unit is powered up and the software has loaded properly. Should a failure occur, the relay will be
disengaged until the unit returns to a normal state of operation. A failure is defined as a condition which
causes the unit to stop running.
A SPDT set of contacts are provided to the user. These three contact connections are known as "Common",
"Normally Open" and "Normally Closed", and are electrically isolated to the relay. The contacts are rated for
voltages up to 30V DC /AC with a maximum current of 3A.