LINETRAXX® VMD423/VMD423H

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

VMD423 with separate supply voltage
VMD423H is supplied by the system being monitored
Undervoltage, overvoltage and underfrequency and overfrequency monitoring in 3(N)AC systems AC 0...500 V
Monitoring of overvoltage by average determination of the latest 10-minute measuring interval
Asymmetry, phase failure and phase sequence monitoring
Start-up delay, response delay and delay on release can be set
Adjustable switching hysteresis
r.m.s. value measurement (AC+DC)
Digital measured value display via multi-functional LC display
LEDs for Power On, Alarm 1, Alarm 2
Measured value memory for operating value
Permanent self-monitoring
Test/reset button internal
Two separate alarm relays for each changeover contact
N/C or N/O operation and fault memory behaviour selectable
Password protection for device settings
Sealable transparent cover
Push-wire terminal (two terminals per connection)
2-module enclosure (36 mm)
RoHS-compliant

Undervoltage < U (Alarm 2)
(Measurement method: 3Ph/3n) AC 10...500 V/10...288 V (184)
Overvoltage > U1 (Alarm 1)
(Measurement method: 3Ph/3n) AC 10...500 V/10...288 V (264)
Overvoltage > U2 (Alarm 1)
(Measurement method: 3Ph/3n) AC 10...288 V (253)
Overvoltage U2 10-minute average determination
Resolution of setting U: 1 V
Asymmetry 	5...30 % (30 %)
Phase failure: by setting the asymmetry
Phase sequence: clockwise R/anticlockwise L (R/on)
Underfrequency < Hz: 45...65 Hz (47.5 Hz)
Overfrequency > Hz: 45...65 Hz (50.2 Hz)
Resolution of setting f: 0.1 Hz
Switching elements: 2 x 1 changeover contacts (K1, K2)
Start-up delay t: 0...300 s (30 s)
Response delay ton1/2: 0...300 s (0.1)
Start-up delay toff: 0...300 s (30 s)
History memory (HiS): for first alarm value data record measured values
Password protection: off/on/0...999 (on/126)
Connection type: Push-wire terminals/Screw terminals
EMC IEC 61326-1
Operating temperature: -25...+55 °C

VMD423-D-1:
Supply voltage US AC 16...72 V/DC 9.6...94 V
Frequency range US 15...460 Hz
VMD423-D-2:
Supply voltage US AC/DC 70...300 V
Frequency range US 15...460 Hz
Power consumption ≤ 4 VA

VMD423H-D-3:
Supply voltage: US Un
Power consumption: ≤ 6 VA
Undervoltage < U (Alarm 2)
(Measurement method: 3Ph/3n ) AC 70...500 V/70...288 V
Overvoltage > U (Alarm 1)
(Measurement method: 3Ph/3n ) AC 70...500 V/70...288 V
Resolution of setting U: 1 V

Manufacturer: 
Bender GmbH & Co. KG
Londorfer Straße 65
35305 Gruenberg

Type: VMD423-D-1
Article number: B93010020

Type: VMD423-D-2
Article number: B93010021

Type: VMD423H-D-3
Article number: B93010022