Novatek-electro RNPP-311-1 Operation Manual

52

ON

f

U

1- trip setting control for Umin/ Umax;

5- output voltage contacts;

2- green LED of the voltage output;

6- output frequency contacts;

3- green LEDs indicating voltage presence on each phase;

7- green LED of the frequency output.

4- input contacts;

RNPP-311-1

THREE PHASE NUMERICAL VOLTAGE
MONITORING RELAY WITH FREQUENCY

PROTECTION

OPERATION MANUAL

CONTROLS DESCRIPTION AND DIMENSIONS DIAGRAM

www.novatek-electro.in

Max. Current

under ~250 V

Max. power

Max. voltage ~

Max. current under

U=30V D.C.

Cosφ = 0.4 - 1.0

2A

200VA

440V

3A

1. General Application and usage

Two channel voltage monitoring relay RNPP-311-1 is modification of standard relay RNPP-311

and performs all functions of voltage control and additional controls the network frequency. It’s

designed for tripping of load in 415 V/50Hz in case of:

 Inadmissible voltage fluctuations (over voltage & under voltage), phase imbalance, phase

loss, phase coincidence (shorting of phases) and wrong phase sequence (channel U)

 Inadmissible increasing / decreasing of network frequency (channel F)

2. Description

The relay is connected in parallel with load through input contacts (L1, L2, L3, N). The relay has
two independent outputs: the output for voltage (channel U) group of changeover contacts 1-2-3 and
output for frequency (channel f) group of changeover contacts 4-5-6. When the relay is not live
(voltage is not applied, the relay is not connected) the 2-3 (5-6) contacts are closed and the 1-2 (4-

5) contacts are open. When the relay is connected in parallel to load, voltage is present in the mains
and there is no cause for the relay tripping, the 2-3 (5-6) contacts open and the 1-2 (4-5) contacts
close.

Contacts potential free relay output is used to energize and de-energize the contactor’s coil. At
relay operation disconnection is carried out by opening circuit supply to coil of magnetic starter
through break contacts 1-2 (4-5).

The 1-2-3, 4-5-6 output contacts specification

Indication

-three green LEDs indicating that mains voltage exists. They signalize about the voltages

presence on all three phases. When any one or two phases are lost the corresponding LEDs go out;

-green LED of the output for the U channel. It glows when the 1-2 contacts are closed;

-green LED of the output for the 2nd channel of frequency. It glows when the 4-5 contacts are

closed.

Operation

When a voltage is applied to the relay the LEDs "Power" glow. If the voltage is normal, i. e. doesn't
fall outside the user set trip thresholds and frequency, the output contact of channel F change its
position - the 4-5 contacts close after 0.5 seconds.

Voltage output of channel U will be turn on after 5-6 seconds – 1-2 contacts close.

After that the relay provides a constant monitoring of the voltage value and frequency of network.

When there is complete absence of voltage and/or voltages fall outside the contacts 1-2 open.

The "Power" LEDs is OFF” Voltage Output”. When voltage parameters return to normal the load

starting will occur automatically when 5-6 seconds delay has expired;

When there are voltage faults output frequency doesn't trip.

When there are frequency faults contacts 4-5 close, the power LEDs is OFF “Output by F “ If there
is no voltage faults in this moment the voltage output doesn’t trip (contacts 1-2 close).

Frequency Output is blocked and contacts 4-5 open. To unblock the relay switch-off power supply
to relay and then switch-on (reset).