ELKO HRN-43 Voltage Monitoring Relay Instructions
- July 20, 2024
- ELKO
Table of Contents
ELKO HRN-43 Voltage Monitoring Relay
Specifications
Manufacturer: ELKO EP, s.r.o.
Country of Origin: Czech Republic
Model : HRN-43 HRN-43N
Function: Voltage monitoring relay for complete control in 3Pincl. asymmetry
Product Description
The HRN-43N voltage monitoring relay is designed to provide comprehensive control in 3-phase systems, including asymmetry detection. It offers various features such as overvoltage/Undervoltage, phase failure indication, phase sequence indication, phase asymmetry indication, and more.
Usage Instructions
Connection
Connect the voltage monitoring terminals (N-L1-L2-L3) according to the provided symbol for HRN-43 or HRN-43N model. Make sure to follow the correct wiring for L1, L2, L3, and N connections.
Function Settings
- Supply voltage terminals (A1-A2): Connect the supply voltage to these terminals.
- Overvoltage/undervoltage, phase failure indication: Monitor these indications for system anomalies.
- Phase sequence indication: Ensure correct phase sequence for proper operation.
- Phase asymmetry indication: Detect any phase imbalances for system reliability.
- Memory function : Use the memory function for storing critical data.
- Output function setting: Configure the output functions as needed.
- Hysteresis setting : Adjust hysteresis settings for optimal performance.
- Time delay Umax/Umin : Set the time delays for voltage thresholds.
- Asymmetry setting: Configure asymmetry settings for the system.
Output Connections
Utilize the output contact terminals (16-15-18 and 28-25-26) for connecting external devices based on relay output operations.
FAQ
- Q: What is the purpose of the phase asymmetry monitoring feature?
- A: The phase asymmetry monitoring feature helps in detecting any imbalances in the voltage phases, ensuring stable and safe operation of the system.
- Q: How to reset the memory function on the HRN-43N model?
- A: To reset the memory function on the HRN-43N model, use the designated memory reset button as indicated in the user manual.
Characteristics
- Relay is designed to monitor voltage in 3-phase networks:
- HRN-43: delta connection 3× 400 V (without neutral)
- HRN-43N: star connection 3× 400/230 V (with neutral)
- Monitors level of voltage in two independent levels (Umax, Umin) overvoltage and undervoltage: system 3× 400 V: range 240 – 480 V system 3× 400/230 V: range 138 – 276 V
- Other monitored parameters: phase failure, sequence, asymmetry (adjustable, can be switched off )
- Setting the monitored lower level (Umin) in % of the set upper-level Umax.
- Adjustable time delay (eliminanting short-term drops and spikes).
- Selectable function of output contacts (independently/in parallel).
- Galvanically isolated supply voltage AC/DC 24 – 240 V, AC 400 V.
- Output contact for each monitored voltage level.
Description
- Supply voltage terminals (A1-A2)
- Supply voltage indication
- Overvoltage/Undervoltage, phase failure indication
- Phase sequence indication
- Phase asymmetry indication
- Voltage monitoring terminals (N-L1-L2-L3)
- Phase asymmetry monitoring (YES/NO)
- Memory function
- Output function setting
- Hysteresis setting
- Time delay Umax/Umin
- Upper-level setting (Umax)
- Memory reset
- Asymmetry setting
- Lower level setting (Umin)
- Output contact 2 (28-25-26)
- Output contact 1 (16-15-18)
Connection
Symbol
Technical parameters
Supply/HRN-43 /HRN-43N
| Supply terminals: | A1-A2 |
|---|---|
| Supply voltage: | UNI |
| Consumption (max.): | 3 VA/1 W |
| Supply voltage: | 400V |
| Consumption (max.): | 5 VA/2.5 W |
| Supply voltage tolerance: | –15 %; +10 % |
Measuring circuit
| Monitored terminals: | L1-L2-L3 | L1-L2-L3-N |
|---|---|---|
| Voltage system: | 3× 400 V (50-60 Hz) | 3× 400 V/230 V (50-60 Hz) |
| Upper level setting (Umax): | 240 – 480 V | 138 – 276 V |
| Lower level setting (Umin): | 35 – 99 %Umax | |
| Max. permanent voltage: | 3× 480 V | |
| Asymmetry: | adjustable, 5 – 20 % + OFF | |
| Peak overload (1 s): | 600 V | 350 V |
| Time delay (t1): | fixed, max. 200 ms | |
| Time delay Umax/Umin (t2): | adjustable, 0.1 – 10 s |
Accuracy
| Setting accuracy (mech.): | 5 % |
|---|---|
| Repeat accuracy: | < 1 % |
| Temperature dependence: | < 0.1 %/°C (°F) |
| Limit values tolerance: | 5 % |
| Hysteresis (fault to OK): | selectable, 5 %/10 % from the upper range value |
Output
| Contact type: | 2× changeover/SPDT (AgNi) |
|---|---|
| Current rating: | 16 A/AC1 |
| Breaking capacity: | 4000 VA/AC1, 384 W/DC1 |
| Inrush current: | 30 A/< 3 s |
| Switching voltage: | 250 V AC/24 V DC |
| Power dissipation (max.): | 2.4 W |
| Mechanical life: | 10.000.000 ops. |
| Electrical life (AC1): | 100.000 ops. |
Other information
| Operating temperature: | –20 .. 55 °C (–4 .. 131 °F) |
|---|---|
| Storage temperature: | –30 .. 70 °C (–22 .. 158 °F) |
Dielectric strength: supply – output
output 1 – output 2
| ****
AC 4 kV
AC 4 kV
Operating position:| any
Mounting:| DIN rail EN 60715
Protection degree:| IP40 front panel / IP20 terminals
Overvoltage category:| III.
Pollution degree:| 2
Cross-wire section – solid/
stranded with ferrule (mm2):
| max. 1× 2.5, 2× 1.5/
max. 1× 2.5 (AWG 14)
Dimensions:| 90 × 52 × 65 mm (3.5˝ × 2˝ × 2.6˝)
Weight:| UNI – 148 g (5.2 oz), 400V – 248 g (8.7 oz)
Standards:| EN 60255-1, EN 60255-26, EN 60255-27
Function
Overvoltage – undervoltage
The function of output contacts:
In order to monitor two levels of voltage, it is possible to select if the output contact will respond to each level individually (see the diagram) or if both contacts will switch in parallel (see diagram “phase sequence”). Selection via DIP switch „Output“.
Graphs legend:
L1, L2, L3 = 3-phase voltage
RESET = memory reset
t1 = time delay, fi xed
t2 = time delay Umax/Umin, adjustable
15-18 = output contact 1
25-28 = output contact 2
LED U = overvoltage/undervoltage indication 
Phase sequence
The function of output contacts:
The function is not applicable in the phase sequence monitoring, the contacts
are switched in parallel.
DIP switch „Output“ is ignored.
Graphs legend:
L1, L2, L3 = 3-phase voltage
RESET = memory reset
t1 = time delay, fi xed
t2 = time delay Umax/Umin, adjustable
15-18 = output contact 1
25-28 = output contact 2
LED = phase sequence indication
Phase asymmetry – failure
Graphs legend:
L1, L2, L3 = 3-phase voltage
RESET = memory reset
t1 = time delay, fi xed
t2 = time delay Umax/Umin, adjustable
– adjustable asymmetry level
15-18 = output contact 1
25-28 = output contact 2
LED = asymmetry indication
Relay is designated to monitor 3-phase circuits. Type HRN-43 controls the interphase voltage, type HRN-43N controls the voltage towards the neutral wire. Relay can monitor the voltage in two levels (overvoltage/Undervoltage), phase sequence/failure and asymmetry. Each fault state is indicated by an individual LED. By DIP switch „Output“ it is possible to select the function of output contacts: independent function (1× for overvoltage, 1× for Undervoltage) or in parallel. Fixed time delay (t1) is applied when changing from fault to OK stateor when de-energized. Adjustable time delay (t2) is applied when changing from OK to fault state. This delay prevents incorrect behavior and oscillation of the output device during short-term voltage drops and peaks.
Voltage monitoring
The upper-level Umax is set in the range 138 – 276 V (resp. 240 – 480 V for HRN-43) and the lower-level Umin in the range of 35 – 99 %Umax. In case any phase deviates from this set band, after a set delay, output contact opens. Output contact again closes after returning back into the monitored band and exceeding fi xed hysteresis (selectable by DIP switch „Hysteresis“). In the event of an outage in two or three phases, the output contacts will open immediately, regardless of the set delay t2.
Phase sequence
Monitors correctness of phase sequence. In case of unwanted change, output contacts open. In case of energization of a relay with an incorrect phase sequence, contacts stay open.
Asymmetry
The level of asymmetry between individual phases is set in the range of 5 – 20
%. In case set asymmetry is exceeded, output contacts open and LED indicating
asymmetry shines. Time delays t1, t2, and hysteresis are applied when
returning to OK state. Monitoring asymmetry can be switched off by the DIP
switch „ASYM“.
The function of output contacts:
The function is not applicable in the phase asymmetry and failure monitoring, the contacts are switched in a parallel way. DIP switch „Output“ is ignored.
Warning
This device is constructed for connection in a 3-phase network AC 3× 400 V or AC 3×400/230 V (according to the type) and must be installed according to norms valid in the state of an application. Installation, connection, setting, and servicing must be carried out by qualified electrician staff only, who have perfectly understood the instructions and functions of the device. This device contains protection against overvoltage peaks and disturbing impulses in the power supply network. For the correct function of the protection of this device, there must be suitable protections of higher degrees (A,B, C) installed in front of them and according to the standards, interference of switching devices must be securely eliminated (contactors, motors, inductive loads, etc.). Before installation, make sure that the device is de-energized and the main switch is in the “OFF” position. Don‘t install the device to sources of excessive electromagnetic interference. Ensure correct installation by perfect air circulation so that during continuous operation and a higher ambient temperature, the device does not exceed the maximum allowed operating temperature. For installation and setting use a screwdriver with a width of approx 2 mm. Keep in mind that this is a fully electronic device and approach accordingly with the installation. The non-problematic function of the device is also dependent on the previous method of transportation, storage, and handling. In case of any signs of damage, deformation, malfunction, or missing parts, don‘t install this device and claim it at the dealer. The product must be treated as electronic waste at the end of its life.
ELKO
EP, s.r.o.
Palackého 493
769 01 Holešov, Všetuly Czech Republic
Tel.: +420 573 514 211
e-mail: elko@elkoep.com
www.elkoep.com
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