ZIEHL EFR4002IPR
ZIEHL EFR4002IPR
ZIEHL EFR4002IPR
Energy Flow Relay / Zero Export Device (Rogowski Coil Version)
English Translation of the Datasheet
| Item | Details |
|---|---|
| Original title | Zero Export Device Type EFR4002IPR — Energy Flow Relay (Measuring Relay for Self-Generation Systems) |
| Manufacturer | ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany (+49 791 504-0, info@ziehl.de, www.ziehl.de) |
| Document version | May 28, 2025 (original manufacturer's catalog, pages 148–151, 4 pages; the header on page 1 is dated May 26, 2025) |
| Difference from EFR4002IP | This model uses three Rogowski coil inputs (333 mV, terminals S1/S2/S3) instead of conventional 1 A / 5 A current transformers. See Section 8 for a detailed comparison. |
| Translation notes | This translation is based on the complete English PDF provided. Professional terminology is retained where appropriate for cross-reference. The original wiring diagrams are reproduced from the source document, with labels primarily in English and German. |
1. Product Overview (Original Page 1)
The EFR4002IPR Energy Flow Relay monitors the direction of current (power) flow between the public electricity grid and a generating plant or consumer loads. The device can be conveniently operated remotely via its integrated web server or directly on the device itself. Measurement values are clearly organized and displayed on the device's display.
When the power generated by an on-site generating plant exceeds actual on-site consumption, self-consumption of the surplus energy is often more economical. This is particularly advantageous when there is a significant difference between the electricity purchase price charged by the grid operator and the feed-in tariff paid for electricity exported to the grid.
Many sites that would otherwise be suitable for photovoltaic installations have previously been unusable because the grid connection point permits only limited power export.
In Germany, the standard VDE-AR-N 4105:2018-11 allows the installed generation capacity to exceed this limit by up to 66.6% or even more, provided that the additional generated electricity is consumed on-site rather than fed into the grid. The EFR4002IPR can monitor the system to help ensure that this requirement is met while maintaining system stability.
The same principle applies to zero-export applications, in which no electrical energy may be exported to the grid. In such applications, the device can serve as an Energy Flow Sensor (EnFluRi). The EFR4002IPR is optimized for these functions and can exchange data with a PPS (Power Plant Controller).
1.1 Key Product Features
Zero-export device model: EFR4002IPR
Compliance-related monitoring: Monitoring of Pav,e in accordance with VDE-AR-N 4105:2018-11.
Application objective: Optimize the self-consumption of self-generated electricity and increase the self-consumption ratio.
Energy Flow Sensor (EnFluRi) and feed-in limitation: Response time < 0.1 s.
Two operating modes: Zero-export device or limiter.
If the permitted feed-in power limit is exceeded, relay K3 disconnects the generating system or part of it.
Before disconnection becomes necessary, regulation can be performed via the analog output, or loads can be switched on via relays K1 and K2 to absorb surplus energy or reduce generator output, thereby avoiding complete disconnection.
Figure 1. Original page 1: Product overview, functions, features and ordering information.
2. Functions
Switching up to three loads: The operating mode can be configured for maximum-load priority, priority-based sequencing (1–2–3), or combinations of the three loads, providing a total of seven stages.
Switch-on and switch-off thresholds: Set the energy-flow levels at which loads are switched on and subsequently switched off.
Switch-on/switch-off delays and minimum on-time: These functions can also be used to control heat pumps (SG Ready), battery chargers and inverters.
3. Features
Suitable for medium-voltage applications.
Compatible with Rogowski coils.
Active power measurement: single-phase or three-phase, range ±99.99 MW.
Pav,e monitoring with predefined settings or freely configurable values.
Pav,e monitoring compliant with the entire limit curve.
Three Rogowski coil inputs, 333 mV signal.
Energy counters for separately recording exported and consumed energy.
Three relay outputs.
Four digital inputs, Y1–Y4, for control signals, such as forcing relays to switch on or off.
Analog output that can be used as a measuring transducer or for stepless control of a load.
Universal control voltage: 24–240 V AC/DC.
IP network connectivity with an integrated web server.
Measurement values can be read via Modbus TCP and SunSpec (Energy Meter model).
4. Technical Data
The original document states that the technical data in this datasheet are excerpts only. For complete technical specifications, refer to the operating manual, which should be followed. Technical specifications are subject to change.
4.1 Power Supply
| Item | Technical specifications |
|---|---|
| Rated supply voltage Us (terminals A1, A2) | 24–240 V AC/DC, 0 / 40–70 Hz |
| Voltage tolerance | 20–297 V AC; 20.4–297 V DC |
| Power consumption | < 3.5 W; < 10.5 VA |
4.2 Relay Outputs K1, K2 and K3
| Item | Technical specifications |
|---|---|
| Contact configuration | 3 × 1 change-over contact |
| Switching voltage | Max. 300 V AC; 300 V DC |
| Conventional thermal current (Ith) | Max. 9 A |
| Maximum switching capacity, AC, cos φ = 1 | 2000 VA |
| Electrical contact life, cos φ = 1 | 10⁵ operations (at 300 V / 9 A) |
| Rated operational current | AC-15: Ie = 6 A, Ue = 250 V; DC-13: Ie = 2 A, Ue = 24 V; DC-13: Ie = 0.2 A, Ue = 240 V |
4.3 Measurement
| Item | Technical specifications |
|---|---|
| Active power measurement (P) | The actual value is obtained by multiplying the measured value by the current transformer and voltage transformer ratio factors. |
| Measuring range per phase / total | −60 to +60 MW / −99.99 to +99.99 MW |
| Maximum active power measurement error | ±0.5% of full scale, ±1 digit |
| Voltage measurement (U), L1 / L2 / L3 relative to N | Resolution: 0.1 V |
| Maximum voltage measurement error | ±0.5% of full scale, ±1 digit |
| Signal input measurement (I/U), S1 / S2 / S3 | Resolution: 100 µV |
| Maximum signal input measurement error | ±0.5% of full scale |
| Line frequency measurement (f) | Range: 40.000–70.000 Hz |
| Maximum line frequency measurement error | ±0.01%, ±1 digit |
4.4 Analog Outputs
| Item | Technical specifications |
|---|---|
| Current output (GND (⏚), I+) | 0/4/0–10…20 mA DC, corresponding to active power of ±999 kW; scalable |
| Current output load | ≤500 Ω |
| Voltage output (GND (⏚), U+) | 0/2/0–5…10 V DC, corresponding to active power of ±999 kW; scalable |
| Voltage output load | ≥1 Ω |
4.5 Ethernet Communication
| Item | Technical specifications |
|---|---|
| Functions | Parameterization, measurement value reading, firmware updates, Modbus TCP and data logging |
| Speed | 10 / 100 Mbit/s |
| IP address | Configurable / DHCP; DHCP enabled by default |
| Subnet mask | Configurable; default: 255.255.255.0 |
4.6 Housing, Installation and Environmental Conditions
| Item | Technical specifications |
|---|---|
| Housing | Design V8; can be installed in a circuit breaker box |
| Dimensions (W × H × D) | 140 × 90 × 58 mm |
| Protection rating: housing / terminals | IP30 / IP20 |
| Mounting | Snap-on mounting on a standard 35 mm DIN rail in accordance with EN 60715, or M4 screw mounting. Additional mounting rails are not included in the scope of delivery. |
| Weight | Approx. 300 g |
| Installation conditions (permissible operating temperature) | −20 to +55 °C |
| Test standard | EN 61010-1 |
5. Wiring Examples
5.1 Example 1: Pav,e Monitoring — Separate Disconnection of System Components (Original Page 3)
Original title: Connection example: Pav,e monitoring, separate shutdown of system components.
This configuration is intended to control the disconnection of individual components of a generating system, such as multiple inverters or generation units. When the permitted feed-in power limit is about to be exceeded, the components are disconnected in stages according to their assigned priorities, avoiding the need to shut down the entire system.
Figure 2. Original page 3: Pav,e monitoring — separate disconnection of system components.
5.2 Example 2: Pav,e Monitoring — Complete System Shutdown via Grid and Plant Protection (Original Page 4)
Original title: Connection example: Pav,e monitoring, complete shutdown via grid and plant protection.
The Pav,e limit-exceeded signal from the EFR4002IPR is connected to the grid and plant protection system (NA-Schutz). The protection system then shuts down or disconnects the entire generating installation from the grid.
Figure 3. Original page 4: Pav,e monitoring — complete system shutdown via grid and plant protection.
6. Ordering Information and Accessories
| Model | Part number | Description |
|---|---|---|
| EFR4002IPR | S225763 | Main energy flow relay / zero-export device, Rogowski coil version |
| ER8 | T224388 | Mounting frame for front-panel installation (accessory) |
| NRCM | S227900 | Rogowski coil (accessory) |
Accessories
ER8 mounting frame: For installation in a front panel.
Standard Rogowski coil: 333 mV output, for example, the ZIEHL NRCM 100A Rogowski coil.
7. Safety and Liability Statement (Original Page 4)
The wiring diagrams in this manual are provided for illustrative purposes only. The manufacturer accepts no liability for errors resulting from incorrect operation or wiring.
Work involving this product may only be performed by qualified personnel familiar with its installation, commissioning and operation.
The safety instructions in the operating manual must be strictly observed.
8. Appendix: Key Differences Between EFR4002IPR and EFR4002IP
The following comparison summarizes the differences identified by comparing the two original manufacturer datasheets. It is intended as a reference for product selection and replacement.
Datasheet versions compared: EFR4002IP dated September 18, 2025, and EFR4002IPR dated May 28, 2025.
| Comparison item | EFR4002IP | EFR4002IPR |
|---|---|---|
| Current input method | Three conventional current transformer inputs, with 1 A or 5 A secondary current; adjustable ratio from 1:1 to 1:250; scalable up to 2,400 A | Three Rogowski coil inputs; 333 mV signal; terminals S1 / S2 / S3; resolution 100 µV |
| Compatible current sensor accessories | ZIEHL AS or WS series current transformers, such as CTM7 61/1A (class 1, 0.5 VA) | ZIEHL NRCM Rogowski coil (part number S227900), such as NRCM 100A |
| Medium-voltage wiring | Compatible with grounded medium-voltage current transformers and measuring devices connected in series | Compatible with Rogowski coils for medium-voltage applications |
| Main unit part number | S227260 | S225763 |
| Rated supply voltage | 24–270 V DC/AC, 0 / 40–70 Hz; <3.5 W, <9 VA | 24–240 V AC/DC (A1, A2), 0 / 40–70 Hz; <3.5 W, <10.5 VA |
| Active power measuring range | −99.99 to +99.99 MW when used with voltage transformers | −60 to +60 MW per phase; −99.99 to +99.99 MW total, multiplied by the CT / VT ratio factors |
| Active power measurement error | ±1% of full scale, ±1 digit | ±0.5% of full scale, ±1 digit |
| Frequency measurement | Not listed separately in the datasheet | 40.000–70.000 Hz; ±0.01%, ±1 digit |
| Analog outputs | 0/4/1–10…20 mA DC; 0/2/0–5…10 V DC; load ≤500 Ω | Current output: 0/4/0–10…20 mA DC (load ≤500 Ω); voltage output: 0/2/0–5…10 V DC (load ≥1 Ω); both scalable and corresponding to ±999 kW |
| Relay rated operational current | AC-15: Ie = 6 A, Ue = 250 V | AC-15: 6 A / 250 V; DC-13: 2 A / 24 V; DC-13: 0.2 A / 240 V |
| Ethernet / communication | IP connectivity, integrated web server, Modbus TCP and SunSpec | Parameterization, measurement values, firmware updates, Modbus TCP and data logging; 10/100 Mbit/s; configurable IP address with DHCP enabled by default |
| Installation | 35 mm DIN rail or M4 screws | Snap-on mounting on a 35 mm DIN rail in accordance with EN 60715, or M4 screws; V8 housing can be installed in a circuit breaker box |
| Wiring examples | (1) Low-voltage grid; (2) low-voltage grid with a measuring device connected in series; (3) grounded current transformer for medium-voltage applications | (1) Pav,e monitoring with separate disconnection of system components; (2) Pav,e monitoring with complete system shutdown via grid and plant protection |