DEIF Undervoltage and overvoltage relay type RMV-112D

DEIF Undervoltage and overvoltage relay type RMV-112D

Product core positioning

RMV-111D is a combined undervoltage and overvoltage relay in the "uni line" series of DEIF company, mainly used for the protection and control of generators. Through three-phase voltage detection, it achieves dual protection of undervoltage (U<) and overvoltage (U>), and is equipped with functions such as timed tripping and fault status LED indication to ensure voltage stability of the power generation system.

Product identification and key information (label content)

The relay comes with a label that indicates the core parameters, which is a key basis for contacting the manufacturer and confirming the configuration, including:

Basic model: RMV-112D (e.g. example label: TYPE RMV-112D 121120).

Measurement and power supply parameters: measurement voltage (such as 230V/400V), voltage module specifications (such as MODULE 230V), auxiliary power supply voltage (such as 24VDC), wiring method (star "STAR" or triangle "DELTA", example label includes "COUPLING DELTA").

Special configurations: delay time, special calibration values, etc. (pre-set by DEIF).

Compliance and labeling: CE certification, installation category (such as CAT III), maximum voltage to ground, dealer number (to be filled in by the dealer).

Relay characteristics: Label the action mode of the relay (such as "RELAY NORM. ENERGY" normally energized type, "LATCH" latch function), the latch circuit needs to disconnect the power supply voltage and reset, even if the input returns to normal, the contacts will still remain in the alarm position.

Note: The relay is equipped with a 200ms power on/off protection circuit: the normally energized contact (NE) does not operate within 200ms after power on to ensure stable function; Monitor the voltage within 200ms after power failure to avoid misjudgment.

Installation instructions

1. Installation method and specifications

Installation type: Supports panel installation, can be fixed on a 35mm DIN rail, or directly installed with 2 4mm screws.

Weight: Approximately 0.650kg.

Spacing requirement: It can be installed in close proximity to other "uni line" series units, but the distance between the relay and other devices/relays must be ≥ 50mm.

Rail placement: If multiple relays are installed on the same DIN rail, the rail must be placed horizontally.

2. Wiring precautions

Wiring differences: It is necessary to distinguish between star (STAR) and delta (DELTA) wiring methods. The specific wiring method should be marked on the product label, and refer to the "Connection diagram" for operation.

Voltage protection: All voltage input terminals can be connected in series with 2A fuses to prevent overcurrent damage.

Static protection: The relay comes with ESD (electrostatic discharge) protection, and no additional anti-static measures are required during installation.

Startup and parameter settings

1. Core parameter setting and indication

Set key parameters through the front knob of the relay and provide feedback on the status with LED lights. The specific correspondence is as follows:

Range of parameter settings: LED/relay action feedback

When the input voltage is lower than the set value (U<) and the rated voltage (U ₙ) is 80%~100%, the corresponding yellow LED will light up (the contact is not activated at this time); After the delay is over, the contact will activate and the red LED will light up

When the input voltage is higher than the set value, the yellow LED of "U>" will light up (at this time, the contact is not activated) when the overvoltage setting value (U>) is 100%~120% of the rated voltage (U ₙ); After the delay is over, the contact will activate and the red LED will light up

After a delay of 0-10s, the relay contacts will activate and the red LED will light up

Hysteresis: 1%~10% of the rated voltage (U ₙ) of the hysteresis value is shared by undervoltage/overvoltage. When the fault voltage drops/rises to within the hysteresis value, the relay contacts reset

2. Set examples (to help understand)

Assuming rated voltage range (U ₙ): 95~105V

Undervoltage setting value: 90% of U ₙ (i.e. 90V)

Overvoltage setting value: 110% of U ₙ (i.e. 110V)

Return difference: 5% of U ₙ (i.e. 5V)

The relay is activated when the voltage is ≤ 90V (under voltage) or ≥ 110V (over voltage); When the voltage returns to the range of 95-105V, the contacts reset.

3. Accuracy Description

Front knob setting accuracy: usually ± 10% of the scale, corresponding to ± 2% of the rated voltage (U ₙ).

Higher precision requirement: It is necessary to adjust the equipment connected to the relay (such as the generator) until the target set value is reached.

Technical specifications

Category specific parameters

Frequency range 40~45~65~70Hz

Continuous maximum input voltage: 1.2 × U ₙ; 10s short-term maximum input: 2 × U ₙ

Load requirement of 2k Ω/V

Relay contact: 1 transfer switch for each relay; Rated values: AC 250V-8A-2000A, DC 24V-8A-2000W; Maximum voltage: AC 250V, DC 150V

Response time<100ms

Electrical isolation between input and output: 3250V (50Hz), lasting for 1 minute