Info!! Ability Render Overvoltage Category (Ovc)

The IEC standards degree Overvoltage Categories, which are sometimes referred to every bit Installation Categories, are every bit follows (most stringent to the to the lowest degree stringent):

Category IV

Used at the beginning of the installation.  Examples are utility transformers, electricity meters, fusing together with distribution panels.  High transient voltages are really likely.

Category III

Used inwards fixed installations together with for cases where the reliability together with the availability of the equipment is plain of written report to particular requirements.  These installations volition accept permanent connectedness to the distribution panel (hard wired).  Wiring impedance, fuses together with circuit breakers somewhat trim back the bird of voltage transients.

Category II

This covers energy-consuming equipment supplied from the fixed installation.  These would hold upward items commonly plugged inwards to a regular wall outlet or other plug inwards fixture requiring 115 or 230Vac.  The impedance of wiring circuits farther reduces transient voltages to a lower level. Outlets, lighting switches together with edifice connections to a greater extent than than 10m from a Category III source are classed at a Category II.

Category I

These are circuits requiring depression voltage, which throttle over voltage weather condition to the appropriate level, i.e. protected electronic circuits.

Each category has to withstand a unlike bird of voltage transient depending upon the nominal input voltage every bit shown inwards Table 1

Table 1: Tolerated transient voltage

The touchstone IEC 60204-1:2016 governs the security of machinery. The full general requirements apply to electrical, electronic together with programmable electronic equipment that are fixed inwards their location.  The equipment covered past times this business office of the touchstone commences at the indicate of connectedness of the provide to the electrical equipment of the machine.

An industrial robot, or textile forming machine, wired to the distribution panel would involve to comply alongside Overvoltage Category III, every bit shown inwards Figure 1. If the AC-DC might provide within of the robot controller was alone OVC II, together with then an isolating transformer (not necessarily a measurement downward type) would accept to hold upward fitted within or betwixt the controller together with the distribution panel.  The impedance of the transformer would hold upward plenty to trim back the transient voltage level.

Figure 1: Levels of Overvoltage Category within of a manufacturing industrial plant life or facility

Some OVC III industrial AC-DC might supplies are available, similar TDK-Lambda’s 240W rated 24V output ZWS240RC-24 might supply.

Although based on TDK-Lambda’s ZWS300BAF-24 which is OVC II, it has increased spacing from the Line together with Neutral to ground, including additional spacing on the input connector.  It is too certified to EN 62477-1 - security requirements for might electronic converter systems together with equipment.  It is said to hold upward a to a greater extent than suitable specification than EN 50178 which covers electronic equipment for purpose inwards might installations.

The purpose of such a might provide tin eliminate the isolation transformer, saving both toll together with space.