405.1200.037.2 - Rel.: 2.21 of 25/02/2008
iii
General Safety Precautions
System
Design
• The System should be designed to prevent equipment malfunction due to
communication faults between the VT and its host controller. This will
assure the protection of both personnel and equipment.
• Do not use the VT as a warning device for critical alarms that can cause
operator injury, production stoppage or machine damage. Every critical
alarm indicator or control, must be designed using appropriate stand
alone hardware devices.
• Redundant failsafe system design should be used in order to ensure
proper safety when the VT is used in special applications such as safety
equipment, non-life support medical devices, disaster prevention
devices, transportation vehicles, etc.
• The VT is not suitable for applications such as medical life support
equipment, hazardous areas or any potentially explosive environments,
aerospace equipment, nuclear power control devices or aircraft control
devices. These kinds of applications require a higher level of safety and
reliability.
Installation
and wiring
• Strictly follow the wiring diagram and grounding recommendations con-
tained in this document, in order to prevent any damaged to the VT or to
the connected devices.
• Do not use any voltage beyond the VT’s specified range in order to pre-
vent damage or electrical shock.
• Make sure power to the unit is off before opening the VT for the calibra-
tion procedure described in this document.
• Do not modify the VT for any reason. Doing this may result in electrical
shock or fire, in addition to loss of Certifications like CE or UL.
• Use the proper torque shown on the label to tighten the terminal screws.
Excess tightening may cause short circuit, fire or device malfunction.
• Do not install the VT in an ambient temperature exceeding the allowed
range. This may result in malfunction or shortened life of the unit.
• Do not limit the VT’s rear-face ventilation, in order to avoid component
overheating.
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