LINETRAXX® VME421H

Undervoltage, overvoltage and frequency monitoring of AC/DC systems 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2)
Integrated energy storage, is supplied by the system being monitored
Various monitoring functions selectable U, f
Password protection for device setting
Preset function (automatic setting of basic parameters)

The voltage relays of the VME421H 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, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME421H takes the supply voltage from the system being monitored and utilizes an internal energy backup.

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Undervoltage, overvoltage and frequency monitoring of AC/DC systems 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2)
Integrated energy storage, is supplied by the system being monitored
Various monitoring functions selectable U, f
Password protection for device setting
Preset function (automatic setting of basic parameters)

The voltage relays of the VME421H 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, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME421H takes the supply voltage from the system being monitored and utilizes an internal energy backup.

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Caratteristiche

Undervoltage, overvoltage and frequency monitoring of AC/DC systems, 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2)
Without external supply voltage
Integrated energy backup
Different monitoring functions selectable < U, > U, < f, > f
Start-up delay, response delay, 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 assignment of basic parameters)

LEDs: Power On, Alarm 1, Alarm 2
Measured value memory for operating value
Continuous self monitoring
Internal test/rest 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

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