LINETRAXX® VME420

Undervoltage, overvoltage and frequency monitoring of AC/DC systems 0…300 V
Various monitoring functions selectable < U, > U, < f, > f
Adjustable start-up delay, response delay and delay on release
Password protection for device setting
Preset function (automatic setting of basic parameters)

The voltage relays of the VME420 series are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value leading to the activation of the alarm relays will be stored. Due to adjustable response times, installationspecific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME420 requires an external supply voltage.

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Undervoltage, overvoltage and frequency monitoring of AC/DC systems 0…300 V
Various monitoring functions selectable < U, > U, < f, > f
Adjustable start-up delay, response delay and delay on release
Password protection for device setting
Preset function (automatic setting of basic parameters)

The voltage relays of the VME420 series are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value leading to the activation of the alarm relays will be stored. Due to adjustable response times, installationspecific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME420 requires an external supply voltage.

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Caratteristiche

Monitoring AC/DC systems for undervoltage, overvoltage and frequency in the voltage range of 0…300 V
Various monitoring functions selectable < U, > U, < f, > f
Start-up delay, response delay and delay on release
Adjustable switching hysteresis
r.m.s. value measurement (AC+DC)
Digital measured value display via multi-functional LC display
Preset function (automatic setting of basic parameters)
LEDs: Power On, Alarm 1, Alarm 2

Measured value memory for operating value
Continuous self monitoring
Internal test/reset button
Two separate alarm relays (one changeover contact each)
N/C or N/O operation and fault memory behaviour selectable
Password protection for device setting
Sealable transparent cover
Two-module enclosure (36 mm)
Push-wire terminal (two terminals per connection)
RoHS compliant

Applicazioni

Single-phase voltage and frequency monitoring of machines and electrical installations
Earth fault monitoring in medium-voltage systems via voltage transformers
Monitoring of battery systems
Switching on and switching off at a certain voltage level