FAQ Search Results

IO-Link was developed to retrieve signals from sensors and actuators (IO-Link devices) at the field level. These signals are imported via an IO-Link master into the corresponding field bus system and transmitted to the automation system.

IP protection classes determine the extent to which electrical equipment is protected from contact, foreign bodies and water. The numbers of the IP protection classes are defined in IEC/EN 60529 and consist of two digits. The first digit indicates the protection from contact and dust and the second digit the protection from the ingress of water.

Convection cooling is a passive form of cooling without forced ventilation from fans.

MTBF stands for mean time between failures and defines the statistical probability of an accidental device failure.

The nominal voltage is the specified system voltage of the supply circuit that the power supply is connected to. In the case of 3-phase systems, the nominal voltage is the voltage between the phase conductors.

A negative temperature coefficient or NTC resistor has a relatively high resistance when it is cold, but almost no resistance at high temperatures.

Open frame power supplies have no housing and are designed to comply with protection class IP00.

An optocoupler is a component that consists of a photodiode (LED) and an electrically isolated phototransistor. It transmits signals and is often used for galvanic isolation in the control circuit of power supplies.

OVP or overvoltage protection refers to a protection circuit that restricts the output voltage to a predefined maximum value.

Parallel mode distributes the current equally between power supplies that are connected in parallel. In parallel mode, the output voltage is regulated so that at no load it is around 5% higher than at nominal load.

The power factor or cos phi of a power supply is the ratio between the real power and the apparent power.

The reliability and availability of the DC voltage can be increased with the help of a redundant system. To create a redundant system, an additional power supply must be installed in reserve. This power supply then provides the necessary load current if another power supply in the system fails.

The IEC/EN 61140 standard classifies electrical equipment according to its safety with regard to shock currents and electric shocks.

A shutdown input is a signal input that allows a power supply to be shut down by means of an externally supplied voltage or a simple switch. A shutdown input is galvanically isolated from the input voltage and can be supplied by separated extra-low voltage (SELV) circuits.

A surge is a transient voltage (e.g. on the mains power line) caused by nearby lightning strikes or inductive voltage spikes after a circuit breaker has been triggered by a short circuit.