*mydirectindustry

Catalogs
BENDER GmbH & Co KG
LINETRAXX® VMD423/VMD423H

LINETRAXX® VMD423/VMD423H

Product catalog summary

Product Overview
The LINETRAXX® VMD423/VMD423H is a three-phase voltage and frequency monitoring relay designed for use in Combined Heat and Power plants, wind power stations, hydroelectric power plants, and photovoltaic systems. It ensures compliance with DIN V VDE V 0126-1-1 standards for mains decoupling in private electricity generation systems exceeding 30 kW.

Specifications
The VMD423 series monitors voltage and frequency at the feed-in point to the medium voltage grid using voltage transformers. It activates an alarm relay within ≤ 80 ms when limit values are reached. The device measures voltages as r.m.s. values and monitors asymmetry, phase failure, and phase sequence. The VMD423 requires a separate supply voltage, while the VMD423H is powered by the system it monitors.

Device Features

Separate supply voltage for VMD423; system-supplied for VMD423H.
Monitors undervoltage, overvoltage, underfrequency, and overfrequency in 3(N)AC systems.
Includes start-up delay, response delay, and delay on release.
Features a digital LC display and continuous self-monitoring.
Equipped with two separate alarm relays and password protection for settings.

Functionality
Upon applying supply voltage, a start-up delay begins. The device uses adjustable measuring channels for overvoltage/undervoltage and overfrequency/underfrequency. Alarm relays switch when response values are exceeded, and the alarm LEDs light up. The device includes a fault memory and manual reset options.

Technical Data

Rated insulation voltage: 400 V
Supply voltage for VMD423-D-1: AC 16–72 V/DC 9.6–94 V
Supply voltage for VMD423-D-2: AC/DC 70–300 V
Measuring range: AC 0–500 V
Response time: ≤ 80 ms
Operating temperature: -25 to +55 °C

Applications
The relay is suitable for monitoring automatic switching points in private electricity generation systems operating in parallel with the public low voltage grid. It is applicable for photovoltaic systems, CHPs, wind power, and hydro power plants.

Approvals
The device holds certificates of non-objection in accordance with DIN V VDE V 0126-1-1:2006-2 for France, Switzerland, and the Czech Republic, and C 10/11 for Belgium.

Ordering Information
Various models are available with different supply voltage specifications, and accessories such as mounting clips are available separately.

Catalog excerpts

Three-phase voltage and frequency monitoring relay for CHPs (Combined Heat and Power plants), wind power stations, hydroelectric power plants and photovoltaic systems in accordance with DIN V VDE V 0126-1-1

Open the catalog to page 1

for CHPs, wind, hydroelectric and photovoltaic systems in accordance with DIN V VDE V 0126-1-1 Product description When feeding power into the public grid, voltage and frequency monitoring in accordance with DIN V VDE V 0126-1-1 is required to ensure mains decoupling of private electricity generation systems >30 kW (such as CHPs, wind, hydrodynamic and photovoltaic power plants). The three-phase VMD423 series voltage and frequency relays monitor the voltage and frequency at the point of feed-in. When power is fed into the medium voltage grid, the output voltages and frequencies are measured by...

Open the catalog to page 2

Three-phase voltage and frequency relay LINETRAXX® VMD423/VMD423H Operating elements 1 - Power On LED "ON" (green); Lights up when voltage is available and when the device is in operation or flashes in case of system fault alarm. 2 - Alarm LED "ALT (yellow): Lights up in case of the following fault messages: >U1/>U2 (10 minute average determination) 3 - Alarm LED "AL2" (yellow): Lights up in case of the following Both the alarm LEDs "AL1" and "AL2" light up in case of the following fault messages: <f/>f/Asy/PHS, the alarm LEDs flash in case of system fault alarm. 4 - Display: Displays operating...

Open the catalog to page 3

Three-phase voltage and frequency relay LINETRAXX® VMD423/VMD423H Z BENDER 1 - Connection to the system/load to be monitored 2 - Supply voltage US (see ordering information) 5 - Fuse as line protection. 6 A fuse recommended. If being supplied from an IT system, both lines have to be protected by a fuse. 1 - Connection to the system to be monitored and to supply voltage 4 - Fuse as line protection. 6 A fuse recommended. If being supplied from an IT system, both lines have to be protected by a fuse.

Open the catalog to page 4

Three-phase voltage and frequency relays LINETRAXX® VMD423/VMD423H Technical data none (internally supplied by Un) < 6 VA 5.30 % (30 %)* by setting the asymmetry clockwise R/anticlockwise L (R/on)* ±1.5 %, ±2 digits 1.40 % (5 %)* 45.65 Hz (47.5 Hz)* 45.65 Hz (50.2 Hz)* 0.1 Hz Rated insulation voltage 400 V Rated impulse voltage/pollution degree 4 kV/3 Protective separation (reinforced insulation) between Voltage test according to IEC 61010-1: Supply voltage Supply voltage Us Frequency range Us VMD423-D-2: Supply voltage Us Frequency range Us Power consumption Supply voltage Us Power consumption...

Open the catalog to page 5

Dimension diagram XM420 (VMD423) Connection Connection type Connection properties rigid flexible without ferrule flexible with ferrule Stripping length Opening force Test opening, diameter push-wire terminals Dimensions in mm Screw mounting Open the front plate cover in Note: The uPPer mounting cNp direction of arrow! must be ordered separately Other Operating mode Mounting Degree of protection, internal components (IEC 60529) Degree of protection, terminals (IEC 60529) Enclosure material Screw mounting DIN rail mounting acc. to Flammability class Documentation number continuous operation any...

Open the catalog to page 6

LINETRAXX® VMD423/VMD423H

LINETRAXX® VMD423/VMD423H

Catalog excerpts

All BENDER GmbH & Co KG catalogs and technical brochures