Inovance H0U Series PLC User Manual
Page 2 of 14
be cut off. When a failure occurs on the controller circuit, related outputs may be out
of control. Thus, an appropriate external circuit must be designed to ensure normal
running of the equipment.
z When the output units such as relay or transistor are damaged, related outputs will be
out of control and be continuously kept ON or OFF. Return the AC drive with
damaged output unit to Inovance for repair.
z The PLC is designed for indoor electric environment. A lightning protection device
must be installed for the power supply system, so that lightening overvoltage is not
applied on terminals of the PLC, avoiding damage to the equipment.
During Installation
z Install the PLC in places free from dust, oil smoke, conducting dust, corrosive gas,
combustible gas, high temperature, condensation, wind & rain, vibration and shock.
In addition, electric shock, fire, malfunction may also cause damage and deterioration
to the equipment.
z During screw hole processing and wiring, ensure that no metal filing and cable end
falls into the ventilation hole of the controller, because such stuff may causes a fire,
fault, or malfunction.
z After installation of the newly purchased PLC is complete, ensure that there is no
foreign stuff on the surface of ventilation. Failure to comply may result in poor cooling
effect during running, which may lead to a fire, fault or malfunction.
z The installation and wiring must be secure and reliable. Poor contact may cause
malfunction.
At Wiring
z Ensure that all power supplies are cut off before installation or wiring.
z During screw hole processing and wiring, ensure that no metal filings or cable end
drops into ventilation holes of the controller. Failure to comply may result in a fire,
fault or malfunction.
z Perform wiring or plug/remove the cable connector only after power-off. Failure to
comply may result in electric shock or damage to the circuit.
z Don’t provide external power supply to terminal 24+ of the main unit or expansion
unit.
z Use shielded cables for high-frequency signal input/output in applications with severe
interference to enhance anti-interference capacity of the system.
During Running and Maintenance
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